挂载整个configmap

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apiVersion: v1
kind: ConfigMap
metadata:
  name: busybox-configmap
data:
  1.txt: |
    11111111111111111
  2.txt: |
    22222222222222222

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: busybox
spec:
  selector:
    matchLabels:
      app: busybox
  replicas: 1
  template:
    metadata:
      labels:
        app: busybox
    spec:
      volumes:
      - name: busybox-volume
        configMap:
          name: busybox-configmap

      containers:
      - name: busybox
        image: busybox
        args:
        - /bin/sh
        - -c
        - sleep infinity

        volumeMounts:
        - name: busybox-volume                 # volumes的名字
          mountPath: /root/test/               # 容器内的目录

此时pod内/root/test/目录下会有两个文件 1.txt 和 2.txt。另外，如果/root/test/ 目录原来是有数据的，那么挂载后里面也就只有 1.txt 和 2.txt， 看不到原来的文件了。（和挂载类似）

挂载指定的key到目录

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apiVersion: v1
kind: ConfigMap
metadata:
  name: busybox-configmap
data:
  1.txt: |
    11111111111111111
  2.txt: |
    22222222222222222

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: busybox
spec:
  selector:
    matchLabels:
      app: busybox
  replicas: 1
  template:
    metadata:
      labels:
        app: busybox
    spec:
      volumes:
      - name: busybox-volume
        configMap:
          name: busybox-configmap
          items:
            - key: 1.txt                      # 对应的configmap的key
              path: logstash.yml              # 挂载到容器内的文件名
            - key: 2.txt
              path: jvm.options

      containers:
      - name: busybox
        image: busybox
        args:
        - /bin/sh
        - -c
        - sleep infinity

        volumeMounts:
        - name: busybox-volume                 # volumes的名字
          mountPath: /root/test/               # 容器内的目录

如上配置， 在容器中文件即为：

/root/test/logstash.yml –> 11111111111111111
/root/test/jvm.options –> 22222222222222222

使用subpath挂载configmap

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apiVersion: apps/v1
kind: Deployment
metadata:
  name: busybox
spec:
  selector:
    matchLabels:
      app: busybox
  replicas: 1
  template:
    metadata:
      labels:
        app: busybox
    spec:
      volumes:
      - name: busybox-volume
        configMap:
          name: busybox-configmap

      containers:
      - name: busybox
        image: busybox
        args:
        - /bin/sh
        - -c
        - sleep infinity
        volumeMounts:
        - name: busybox-volume                      # volume的名字
          mountPath: /root/busybox-volume/1.txt     # 容器内的路径
          subPath: 1.txt                            # 指定configmap里面的key
        - name: busybox-volume
          mountPath: /root/busybox-volume/2.txt
          subPath: 2.txt

这种挂载方式不会影响到/root/test/目录内原始的文件，只是挂载了这两个文件。