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 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.

Notes and Constraints

• The size of a ConfigMap resource file cannot exceed 1 MB.
• ConfigMaps cannot be used in static pods.

Procedure

1. Log in to the CCE console and click the cluster name to access the cluster console.
2. Choose ConfigMaps and Secrets in the navigation pane and click Create ConfigMap in the upper right corner.
3. Configure parameters.

   Table 1 Parameters for creating a ConfigMap

   Parameter	Description
   Name	Name of the ConfigMap you create, which must be unique in a namespace.
   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	Data of a ConfigMap, in the key-value pair format. Click to add data. The value can be in string, JSON, or YAML format.
   Label	Label of the ConfigMap. Enter a key-value pair and click Confirm.

4. Click OK.

   The new ConfigMap is displayed in the ConfigMap list.

Creating a ConfigMap Using kubectl

1. Use kubectl to access the cluster. For details, see Connecting to a Cluster Using kubectl.
2. Create a file named cce-configmap.yaml and edit it.

   vi cce-configmap.yaml

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

   Table 2 Key parameters

   Parameter	Description
   apiVersion	The value is fixed at v1.
   kind	The value is fixed at ConfigMap.
   metadata.name	ConfigMap name, which can be customized.
   data	ConfigMap data. The value must be key-value pairs.

3. Run the following commands to create a ConfigMap.

   kubectl create -f cce-configmap.yaml

   Run the following commands to view the created ConfigMap:

   kubectl get cm

   NAME               DATA            AGE
   cce-configmap      3               7m

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