Creating a ConfigMap

Scenario

A ConfigMap is a type of resource that stores configuration information required by a workload. Its content is user-defined. After creating ConfigMaps, you can use them as files or environment variables in a containerized workload.

ConfigMaps allow you to decouple configuration files from container images to enhance the portability of containerized workloads.

Benefits of ConfigMaps:

• Manage configurations of different environments and services.
• Deploy workloads in different environments. Multiple versions are supported for configuration files so that you can update and roll back workloads easily.
• Quickly import configurations in the form of files to containers.

Prerequisites

Cluster and node resources have been created. For more information, see Creating a CCE Cluster. If you have available clusters and node resources, skip this operation.

Procedure

1. Log in to the CCE console. In the navigation pane, choose Configuration Center > ConfigMaps. Click Create ConfigMap.
2. You can create a ConfigMap directly or based on YAML. If you create a ConfigMap based on YAML, go to 4.
3. Method 1: Create a ConfigMap directly.
   Set the parameters by referring to Table 1.

   Table 1 Parameters for creating a ConfigMap

   Parameter	Description
   Name	Name of a ConfigMap, which must be unique in a namespace.
   Cluster	Cluster that will use the ConfigMap you create.
   Namespace	Namespace to which the ConfigMap belongs. If you do not specify this parameter, the value default is used by default.
   Description	Description of the ConfigMap.
   Data	The workload configuration data can be used in a container or used to store the configuration data. Key indicates a file name. Value indicates the content in the file. Click Add Data. Set Key and Value.
   Labels	Labels are attached to objects such as workloads, nodes, and Services in key-value pairs. Labels define the identifiable attributes of these objects and are used to manage and select the objects. Click Add Label. Set Key and Value.

4. Method 2: Create a ConfigMap based on YAML.
   

   To create ConfigMaps by uploading a file, ensure that the resource description file has been created. CCE supports files in YAML format. For more information, see ConfigMap Requirements.

   Click Create YAML on the right of the page.

   • Method 1: Import the orchestration file.

     Click Add File to import the file in YAML format. The orchestration content can be directly displayed.

   • Method 2: Directly orchestrate the content.

     In the orchestration content area, enter the content of the YAML file.

5. After the configuration is complete, click Create.

   The new ConfigMap is displayed in the ConfigMap list.

ConfigMap Requirements

A ConfigMap resource file must be in YAML format, and the file size cannot exceed 2 MB.

apiVersion: v1
kind: ConfigMap
metadata:
  name: test-configmap
data:
  data-1: value-1
  data-2: value-2

Creating a ConfigMap Using kubectl

1. Configure the kubectl command to connect an ECS to the cluster. For details, see Connecting to a Cluster Using kubectl.
2. Create and edit the cce-configmap.yaml file.

   vi cce-configmap.yaml

   apiVersion: v1
   kind: ConfigMap
   metadata:
     name: cce-configmap
   data:
     SPECIAL_LEVEL: Hello
     SPECIAL_TYPE: CCE

3. Run the following commands to create a ConfigMap.

   kubectl create -f cce-configmap.yaml

   kubectl get cm

   NAME               DATA            AGE
   cce-configmap      3               3h
   cce-configmap1     3               7m

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