:original_name: cce_10_0222.html

.. _cce_10_0222:

Managing a Node Pool
====================

Notes and Constraints
---------------------

The default node pool DefaultPool does not support the following management operations.

Configuring Kubernetes Parameters
---------------------------------

CCE allows you to highly customize Kubernetes parameter settings on core components in a cluster. For more information, see `kubelet <https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet/>`__.

This function is supported only in clusters of **v1.15 and later**. It is not displayed for clusters earlier than v1.15.

#. Log in to the CCE console.
#. Click the cluster name and access the cluster console. Choose **Nodes** in the navigation pane and click the **Node Pools** tab on the right.
#. Choose **More** > **Manage** next to the node pool name.
#. On the **Manage Component** page on the right, change the values of the following Kubernetes parameters:

   .. table:: **Table 1** kubelet

      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | Parameter                  | Description                                                                                                                                                                                                                                                                                                                                                                                                        | Default Value                                                                                                                   | Remarks                                                                                                                                                                                                                                                               |
      +============================+====================================================================================================================================================================================================================================================================================================================================================================================================================+=================================================================================================================================+=======================================================================================================================================================================================================================================================================+
      | cpu-manager-policy         | Specifies the CPU core binding configuration. For details, see :ref:`CPU Core Binding <cce_10_0551>`.                                                                                                                                                                                                                                                                                                              | none                                                                                                                            | The values can be modified during the node pool lifecycle.                                                                                                                                                                                                            |
      |                            |                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      |                            | -  **none**: disables pods from exclusively occupying CPUs. Select this value if you want a large pool of shareable CPU cores.                                                                                                                                                                                                                                                                                     |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      |                            | -  **static**: enables pods to exclusively occupy CPUs. Select this value if your workload is sensitive to latency in CPU cache and scheduling.                                                                                                                                                                                                                                                                    |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | kube-api-qps               | Query per second (QPS) to use while talking with kube-apiserver.                                                                                                                                                                                                                                                                                                                                                   | 100                                                                                                                             |                                                                                                                                                                                                                                                                       |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | kube-api-burst             | Burst to use while talking with kube-apiserver.                                                                                                                                                                                                                                                                                                                                                                    | 100                                                                                                                             |                                                                                                                                                                                                                                                                       |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | max-pods                   | Maximum number of pods managed by kubelet.                                                                                                                                                                                                                                                                                                                                                                         | 40                                                                                                                              |                                                                                                                                                                                                                                                                       |
      |                            |                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      |                            |                                                                                                                                                                                                                                                                                                                                                                                                                    | 20                                                                                                                              |                                                                                                                                                                                                                                                                       |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | pod-pids-limit             | PID limit in Kubernetes                                                                                                                                                                                                                                                                                                                                                                                            | -1                                                                                                                              |                                                                                                                                                                                                                                                                       |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | with-local-dns             | Whether to use the local IP address as the ClusterDNS of the node.                                                                                                                                                                                                                                                                                                                                                 | false                                                                                                                           |                                                                                                                                                                                                                                                                       |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | event-qps                  | QPS limit for event creation                                                                                                                                                                                                                                                                                                                                                                                       | 5                                                                                                                               |                                                                                                                                                                                                                                                                       |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | allowed-unsafe-sysctls     | Insecure system configuration allowed.                                                                                                                                                                                                                                                                                                                                                                             | []                                                                                                                              |                                                                                                                                                                                                                                                                       |
      |                            |                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      |                            | Starting from **v1.17.17**, CCE enables pod security policies for kube-apiserver. You need to add corresponding configurations to **allowedUnsafeSysctls** of a pod security policy to make the policy take effect. (This configuration is not required for clusters earlier than v1.17.17.) For details, see :ref:`Example of Enabling Unsafe Sysctls in Pod Security Policy <cce_10_0275__section155111941177>`. |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | over-subscription-resource | Whether to enable node oversubscription.                                                                                                                                                                                                                                                                                                                                                                           | true                                                                                                                            | ``-``                                                                                                                                                                                                                                                                 |
      |                            |                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      |                            | If this parameter is set to **true**, the node oversubscription feature is enabled. For details, see :ref:`Hybrid Deployment of Online and Offline Jobs <cce_10_0384>`.                                                                                                                                                                                                                                            |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | colocation                 | Whether to enable node hybrid deployment.                                                                                                                                                                                                                                                                                                                                                                          | true                                                                                                                            | ``-``                                                                                                                                                                                                                                                                 |
      |                            |                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      |                            | If this parameter is set to **true**, the node hybrid deployment feature is enabled. For details, see :ref:`Hybrid Deployment of Online and Offline Jobs <cce_10_0384>`.                                                                                                                                                                                                                                           |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | kube-reserved-mem          | Reserved node memory.                                                                                                                                                                                                                                                                                                                                                                                              | Depends on node specifications. For details, see :ref:`Formula for Calculating the Reserved Resources of a Node <cce_10_0178>`. | The sum of kube-reserved-mem and system-reserved-mem is less than half of the memory.                                                                                                                                                                                 |
      |                            |                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      | system-reserved-mem        |                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | topology-manager-policy    | Set the topology management policy.                                                                                                                                                                                                                                                                                                                                                                                | none                                                                                                                            | The values can be modified during the node pool lifecycle.                                                                                                                                                                                                            |
      |                            |                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      |                            | Valid values are as follows:                                                                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                 | .. important::                                                                                                                                                                                                                                                        |
      |                            |                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      |                            | -  **restricted**: kubelet accepts only pods that achieve optimal NUMA alignment on the requested resources.                                                                                                                                                                                                                                                                                                       |                                                                                                                                 |    NOTICE:                                                                                                                                                                                                                                                            |
      |                            | -  **best-effort**: kubelet preferentially selects pods that implement NUMA alignment on CPU and device resources.                                                                                                                                                                                                                                                                                                 |                                                                                                                                 |    Exercise caution when modifying topology-manager-policy and topology-manager-scope will restart kubelet and recalculate the resource allocation of pods based on the modified policy. As a result, running pods may restart or even fail to receive any resources. |
      |                            | -  **none** (default): The topology management policy is disabled.                                                                                                                                                                                                                                                                                                                                                 |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      |                            | -  **single-numa-node**: kubelet allows only pods that are aligned to the same NUMA node in terms of CPU and device resources.                                                                                                                                                                                                                                                                                     |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | topology-manager-scope     | Set the resource alignment granularity of the topology management policy. Valid values are as follows:                                                                                                                                                                                                                                                                                                             | container                                                                                                                       |                                                                                                                                                                                                                                                                       |
      |                            |                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      |                            | -  **container** (default)                                                                                                                                                                                                                                                                                                                                                                                         |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      |                            | -  **pod**                                                                                                                                                                                                                                                                                                                                                                                                         |                                                                                                                                 |                                                                                                                                                                                                                                                                       |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | resolv-conf                | DNS resolution configuration file specified by the container                                                                                                                                                                                                                                                                                                                                                       | The default value is null.                                                                                                      | ``-``                                                                                                                                                                                                                                                                 |
      +----------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

   .. table:: **Table 2** kube-proxy

      +----------------------------------+-------------------------------------------------------------+---------------+------------------------------------------------------------+
      | Parameter                        | Description                                                 | Default Value | Remarks                                                    |
      +==================================+=============================================================+===============+============================================================+
      | conntrack-min                    | sysctl -w net.nf_conntrack_max                              | 131072        | The values can be modified during the node pool lifecycle. |
      +----------------------------------+-------------------------------------------------------------+---------------+------------------------------------------------------------+
      | conntrack-tcp-timeout-close-wait | sysctl -w net.netfilter.nf_conntrack_tcp_timeout_close_wait | 1h0m0s        |                                                            |
      +----------------------------------+-------------------------------------------------------------+---------------+------------------------------------------------------------+

   .. table:: **Table 3** Network components (available only for CCE Turbo clusters)

      +---------------------------+------------------------------------------------------------------------------------------------------+-----------------+-----------------+
      | Parameter                 | Description                                                                                          | Default Value   | Remarks         |
      +===========================+======================================================================================================+=================+=================+
      | nic-threshold             | Low threshold of the number of bound ENIs:High threshold of the number of bound ENIs                 | Default: 0:0    | ``-``           |
      |                           |                                                                                                      |                 |                 |
      |                           | .. note::                                                                                            |                 |                 |
      |                           |                                                                                                      |                 |                 |
      |                           |    This parameter is being discarded. Use the dynamic pre-binding parameters of the other four ENIs. |                 |                 |
      +---------------------------+------------------------------------------------------------------------------------------------------+-----------------+-----------------+
      | nic-minimum-target        | Minimum number of ENIs bound to the nodes in the node pool                                           | Default: 10     | ``-``           |
      +---------------------------+------------------------------------------------------------------------------------------------------+-----------------+-----------------+
      | nic-maximum-target        | Maximum number of ENIs pre-bound to a node at the node pool level                                    | Default: 0      | ``-``           |
      +---------------------------+------------------------------------------------------------------------------------------------------+-----------------+-----------------+
      | nic-warm-target           | Number of ENIs pre-bound to a node at the node pool level                                            | Default: 2      | ``-``           |
      +---------------------------+------------------------------------------------------------------------------------------------------+-----------------+-----------------+
      | nic-max-above-warm-target | Reclaim number of ENIs pre-bound to a node at the node pool level                                    | Default: 2      | ``-``           |
      +---------------------------+------------------------------------------------------------------------------------------------------+-----------------+-----------------+

   .. table:: **Table 4** Pod security group in a node pool (available only for CCE Turbo clusters)

      +------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------+-----------------+
      | Parameter                    | Description                                                                                                                                                                                                                                                                                         | Default Value   | Remarks         |
      +==============================+=====================================================================================================================================================================================================================================================================================================+=================+=================+
      | security_groups_for_nodepool | -  Default security group used by pods in a node pool. You can enter the security group ID. If this parameter is not set, the default security group of the cluster container network is used. A maximum of five security group IDs can be specified at the same time, separated by semicolons (;). | ``-``           | ``-``           |
      |                              | -  The priority of the security group is lower than that of the security group configured for the :ref:`SecurityGroup <cce_10_0288>` resource object.                                                                                                                                               |                 |                 |
      +------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------+-----------------+

   .. table:: **Table 5** Docker (available only for node pools that use Docker)

      +-----------------------+---------------------------------------------------------------+-----------------+--------------------------------------------------------------------------------------------------------+
      | Parameter             | Description                                                   | Default Value   | Remarks                                                                                                |
      +=======================+===============================================================+=================+========================================================================================================+
      | native-umask          | \`--exec-opt native.umask                                     | normal          | Cannot be changed.                                                                                     |
      +-----------------------+---------------------------------------------------------------+-----------------+--------------------------------------------------------------------------------------------------------+
      | docker-base-size      | \`--storage-opts dm.basesize                                  | 0               | Cannot be changed.                                                                                     |
      +-----------------------+---------------------------------------------------------------+-----------------+--------------------------------------------------------------------------------------------------------+
      | insecure-registry     | Address of an insecure image registry                         | false           | Cannot be changed.                                                                                     |
      +-----------------------+---------------------------------------------------------------+-----------------+--------------------------------------------------------------------------------------------------------+
      | limitcore             | Maximum size of a core file in a container. The unit is byte. | 5368709120      | ``-``                                                                                                  |
      +-----------------------+---------------------------------------------------------------+-----------------+--------------------------------------------------------------------------------------------------------+
      | default-ulimit-nofile | Limit on the number of handles in a container                 | {soft}:{hard}   | The value cannot exceed the value of the kernel parameter **nr_open** and cannot be a negative number. |
      |                       |                                                               |                 |                                                                                                        |
      |                       |                                                               |                 | You can run the following command to obtain the kernel parameter **nr_open**:                          |
      |                       |                                                               |                 |                                                                                                        |
      |                       |                                                               |                 | .. code-block::                                                                                        |
      |                       |                                                               |                 |                                                                                                        |
      |                       |                                                               |                 |    sysctl -a | grep nr_open                                                                            |
      +-----------------------+---------------------------------------------------------------+-----------------+--------------------------------------------------------------------------------------------------------+

#. Click **OK**.

Editing a Node Pool
-------------------

#. Log in to the CCE console.

#. Click the cluster name and access the cluster console. Choose **Nodes** in the navigation pane and click the **Node Pools** tab on the right.

#. Click **Edit** next to the name of the node pool you will edit. In the **Edit Node Pool** page, edit the following parameters:

   **Basic Settings**

   .. table:: **Table 6** Basic settings

      +-----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | Parameter                         | Description                                                                                                                                                                                                                                                                                                                                                                                                                                     |
      +===================================+=================================================================================================================================================================================================================================================================================================================================================================================================================================================+
      | Node Pool Name                    | Name of the node pool.                                                                                                                                                                                                                                                                                                                                                                                                                          |
      +-----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | Auto Scaling                      | By default, this parameter is disabled.                                                                                                                                                                                                                                                                                                                                                                                                         |
      |                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
      |                                   | After you enable autoscaler by clicking |image1|, nodes in the node pool are automatically created or deleted based on service requirements.                                                                                                                                                                                                                                                                                                    |
      |                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
      |                                   | -  **Maximum Nodes** and **Minimum Nodes**: You can set the maximum and minimum number of nodes to ensure that the number of nodes to be scaled is within a proper range.                                                                                                                                                                                                                                                                       |
      |                                   | -  **Priority**: A larger value indicates a higher priority. For example, if this parameter is set to **1** and **4** respectively for node pools A and B, B has a higher priority than A, and auto scaling is first triggered for B. If the priorities of multiple node pools are set to the same value, for example, **2**, the node pools are not prioritized and the system performs scaling based on the minimum resource waste principle. |
      |                                   | -  **Cooldown Period**: Required. The unit is minute. This parameter indicates the interval between the previous scale-out action and the next scale-in action.                                                                                                                                                                                                                                                                                 |
      |                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
      |                                   | If the **Autoscaler** field is set to on, install the :ref:`autoscaler add-on <cce_10_0154>` to use the autoscaler feature.                                                                                                                                                                                                                                                                                                                     |
      +-----------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

   **Advanced Settings**

   .. table:: **Table 7** Advanced settings

      +-----------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | Parameter                         | Description                                                                                                                                                                                                                                                    |
      +===================================+================================================================================================================================================================================================================================================================+
      | K8s label                         | Click **Add Label** to set the key-value pair attached to the Kubernetes objects (such as pods). A maximum of 20 labels can be added.                                                                                                                          |
      |                                   |                                                                                                                                                                                                                                                                |
      |                                   | Labels can be used to distinguish nodes. With workload affinity settings, container pods can be scheduled to a specified node. For more information, see `Labels and Selectors <https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/>`__. |
      |                                   |                                                                                                                                                                                                                                                                |
      |                                   | .. note::                                                                                                                                                                                                                                                      |
      |                                   |                                                                                                                                                                                                                                                                |
      |                                   |    After a **K8s label** is modified, the inventory nodes in the node pool are updated synchronously.                                                                                                                                                          |
      +-----------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | Resource Tag                      | You can add resource tags to classify resources.                                                                                                                                                                                                               |
      |                                   |                                                                                                                                                                                                                                                                |
      |                                   | You can create **predefined tags** in Tag Management Service (TMS). Predefined tags are visible to all service resources that support the tagging function. You can use these tags to improve tagging and resource migration efficiency.                       |
      |                                   |                                                                                                                                                                                                                                                                |
      |                                   | CCE will automatically create the "CCE-Dynamic-Provisioning-Node=\ *node id*" tag.                                                                                                                                                                             |
      |                                   |                                                                                                                                                                                                                                                                |
      |                                   | .. note::                                                                                                                                                                                                                                                      |
      |                                   |                                                                                                                                                                                                                                                                |
      |                                   |    After a **resource tag** is modified, the modification automatically takes effect when a node is added. For existing nodes, you need to manually reset the nodes for the modification to take effect.                                                       |
      +-----------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | Taint                             | This field is left blank by default. You can add taints to set anti-affinity for the node. A maximum of 10 taints are allowed for each node. Each taint contains the following parameters:                                                                     |
      |                                   |                                                                                                                                                                                                                                                                |
      |                                   | -  **Key**: A key must contain 1 to 63 characters starting with a letter or digit. Only letters, digits, hyphens (-), underscores (_), and periods (.) are allowed. A DNS subdomain name can be used as the prefix of a key.                                   |
      |                                   | -  **Value**: A value must start with a letter or digit and can contain a maximum of 63 characters, including letters, digits, hyphens (-), underscores (_), and periods (.).                                                                                  |
      |                                   | -  **Effect**: Available options are **NoSchedule**, **PreferNoSchedule**, and **NoExecute**.                                                                                                                                                                  |
      |                                   |                                                                                                                                                                                                                                                                |
      |                                   | For details, see :ref:`Managing Node Taints <cce_10_0352>`.                                                                                                                                                                                                    |
      |                                   |                                                                                                                                                                                                                                                                |
      |                                   | .. note::                                                                                                                                                                                                                                                      |
      |                                   |                                                                                                                                                                                                                                                                |
      |                                   |    After a **taint** is modified, the inventory nodes in the node pool are updated synchronously.                                                                                                                                                              |
      +-----------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | Edit Key pair                     | Only node pools that use key pairs for login support key pair editing. You can select another key pair.                                                                                                                                                        |
      |                                   |                                                                                                                                                                                                                                                                |
      |                                   | .. note::                                                                                                                                                                                                                                                      |
      |                                   |                                                                                                                                                                                                                                                                |
      |                                   |    The edited key pair automatically takes effect when a node is added. For existing nodes, you need to manually reset the nodes for the key pair to take effect.                                                                                              |
      +-----------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

#. Click **OK**.

   In the node pool list, the node pool status becomes **Scaling**. After the status changes to **Completed**, the node pool parameters are modified successfully. The modified configuration will be synchronized to all nodes in the node pool.

Deleting a Node Pool
--------------------

Deleting a node pool will delete nodes in the pool. Pods on these nodes will be automatically migrated to available nodes in other node pools. If pods in the node pool have a specific node selector and none of the other nodes in the cluster satisfies the node selector, the pods will become unschedulable.

#. Log in to the CCE console.
#. Click the cluster name and access the cluster console. Choose **Nodes** in the navigation pane and click the **Node Pools** tab on the right.
#. Choose **More > Delete** next to a node pool name to delete the node pool.
#. Read the precautions in the **Delete Node Pool** dialog box.
#. In the text box, click **Yes** to confirm that you want to continue the deletion.

.. _cce_10_0222__section550619571556:

Copying a Node Pool
-------------------

You can copy the configuration of an existing node pool to create a new node pool on the CCE console.

#. Log in to the CCE console.
#. Click the cluster name and access the cluster console. Choose **Nodes** in the navigation pane and click the **Node Pools** tab on the right.
#. Choose **More > Copy** next to a node pool name to copy the node pool.
#. The configurations of the selected node pool are replicated to the **Clone Node Pool** page. You can edit the configurations as required and click **Next: Confirm**.
#. On the **Confirm** page, confirm the node pool configuration and click **Create Now**. Then, a new node pool is created based on the edited configuration.

Migrating a Node
----------------

Nodes in a node pool can be migrated. Currently, nodes in a node pool can be migrated only to the default node pool (defaultpool) in the same cluster.

#. Log in to the CCE console and click the cluster name to access the cluster.

#. In the navigation pane, choose **Nodes** and switch to the **Node Pools** tab page.

#. Click **View Node** in the **Operation** column of the node pool to be migrated.

#. Select the nodes to be migrated and choose **More** > **Migrate** to migrate the nodes to the default node pool in batches.

   You can also choose **More** > **Migrate** in the **Operation** column of a single node to migrate the node.

#. In the displayed **Migrate Node** window, confirm the information.

   .. note::

      The migration has no impacts on the original resource tags, Kubernetes labels, and taints of the node.

.. |image1| image:: /_static/images/en-us_image_0000001528627005.png