K8S ConfigMap

ConfigMap is an API object of K8S, which is used to store non-confidential data in key-value pairs. Users can manage ConfigMap through page or kubectl in CCE.

Manage ConfigMap Through Page

Create ConfigMap

Go to "Product Service>Cloud Container Engine CCE->Cluster Details” and click "Configuration Storage>ConfigMap" to enter the ConfigMap list page:

Click "Create ConfigMap” so that the user can create a ConfigMap in the form of YAML. Then, select the cluster and namespace, enter the YAML file, and click "OK" to submit it:

View ConfigMap

Click the ConfigMap name on any line of the list page so that the ConfigMap details page pops up in the right column:

Delete ConfigMap

On the ConfigMap list page, check the ConfigMap you want to delete, click the "Delete" button. After confirming the information, click "OK":

Modify the ConfigMap

On the ConfigMap list page, click the "Edit" button; after completing the modification, click "Update" to submit, and return to the list page after successful submission:

Manage ConfigMap Through kubectl

Example: ConfigMap

apiVersion: v1
kind: ConfigMap
metadata:
  name: app-config
data:
  config.json: |
    {
        "Listener": 9443,
        "MetricsAddress": "0",
        "EnableLeaderElection": true,
        "EnableClusterController": true,
        "EnableInstanceController": true
    }

Pod mounts the ConfigMap as a configuration file:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app-nginx
  labels:
    app: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: hub.baidubce.com/cce/nginx-alpine-go:latest
          volumeMounts:
            - mountPath: /app/conf
              name: app-config
      volumes:
        - configMap:
            defaultMode: 420
            name: app-config
          name: app-config

The file corresponding to the above configmap app-config will be stored in the /app/conf directory of the Pod:

# exec Enter the container:

$ cat /app/conf/config.json 
{
    "Listener": 9443,
    "MetricsAddress": "0",
    "EnableLeaderElection": true,
    "EnableClusterController": true,
    "EnableInstanceController": true
}

After updating the ConfigMap, the files in the Pod are automatically updated within 1 minute.