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
- Log in to the CCE console and click the cluster name to access the cluster console.
- Choose ConfigMaps and Secrets in the navigation pane and click Create ConfigMap in the upper right corner.
- 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.
- Click OK.
The new ConfigMap is displayed in the ConfigMap list.
Creating a ConfigMap Using kubectl
- Use kubectl to access the cluster. For details, see Connecting to a Cluster Using kubectl.
- 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.
- 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
Related Operations
Operation |
Description |
---|---|
Editing a YAML file |
Click Edit YAML in the row where the target ConfigMap resides to edit its YAML file. |
Updating a ConfigMap |
|
Deleting a ConfigMap |
Select the configuration you want to delete and click Delete. Follow the prompts to delete the ConfigMap. |
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