Kubernetes Volumes - 挂载单个文件

场景：挂载 ConfigMap 中的 config.json 到容器 /app/config.json，不影响 /app/ 路径下的其他文件

configMap 配置

apiVersion: v1
kind: ConfigMap
metadata:
  name: xxx-config
data:
  config.json: |
    {
      "port": "3000"
    }

deployment 配置

apiVersion: apps/v1
kind: Deployment
metadata:
  ***
spec:
  ***
  template:
    spec:
      containers:
      - name: xxx
        ***
        volumeMounts:
          - mountPath: /app/config.json
            name: conf
            subPath: config.json
      volumes:
        - name: conf
          configMap:
            name: xxx-config