Upgrading the OS

When CCE releases a new OS image, existing nodes cannot be automatically upgraded. You can manually upgrade them in batches.

  • This operation will upgrade the OS by resetting the node. Workloads running on the node may be interrupted due to single-instance deployment or insufficient schedulable resources. Evaluate the upgrade risks and upgrade the OS during off-peak hours, you can also set the Pod Disruption Budget (PDB, that is disruption budget) policy for important applications to ensure their availability.
  • Nodes that use private images cannot be upgraded.

Procedure

Default node pool

  1. Log in to the CCE console.
  2. Click the cluster name and access the cluster console. Choose Nodes in the navigation pane and click the Node Pools tab on the right.
  3. Click Upgrade next to the default node pool
  4. In the displayed Operating system upgrade window, set upgrade parameters.

    • Max. Unavailable Nodes: specifies the maximum number of unavailable nodes during node synchronization.
    • Target Operating System: You do not need to set this parameter. It is used to display the image information of the target version.
    • Node List: Select the nodes to be upgraded.
    • Login Mode:
      • Key Pair

        Select the key pair used to log in to the node. You can select a shared key.

        A key pair is used for identity authentication when you remotely log in to a node. If no key pair is available, click Create Key Pair.

    • Pre-installation Command: Enter a maximum of 1,000 characters.

      The script will be executed before Kubernetes software is installed. Note that if the script is incorrect, Kubernetes software may fail to be installed.

    • Post-installation Command: Enter a maximum of 1,000 characters.

      The script will be executed after Kubernetes software is installed and will not affect the installation.

  5. Click OK.

Non-default node pool

  1. Log in to the CCE console.
  2. Click the cluster name and access the cluster console. Choose Nodes in the navigation pane and click the Node Pools tab on the right.
  3. Choose More > Synchronize next to a node pool name.
  4. In the displayed Batch synchronization dialog box, set upgrade parameters.

    • Max. Unavailable Nodes: specifies the maximum number of unavailable nodes during node synchronization.
    • Node List: This parameter cannot be set. By default, nodes that can be upgraded are selected.

  5. Click OK.
Parent topic: Managing a Node Pool