2.4、深入pod-configMap

1、 创建configMap

1.1 yaml文件方式

太长，详见此

创建命令
kubectl create -f cm-appconfigfiles.yaml 

1.2 命令行方式

kubectl create cm cm_test --from-literal=k1=v1

1.3 pod通过环境变量使用cm

apiVersion: v1
kind: ConfigMap
metadata:
  name: cm-appvars
data:
  appLogLevel: info
  appDataDir: /var/data

创建个容器使用cm

apiVersion: v1
kind: Pod
metadata:
  name: cm-test-pod
spec:
  containers:
  - name: cm-test-container
    image: busybox
    command: ["/bin/sh", "-c", "env | grep APP"]
    env:
    - name: APPLOGLEVEL
      valueFrom:
        configMapKeyRef:
          name: cm-appvars
          key: appLogLevel
    - name: APPDATADIR
      valueFrom:
        configMapKeyRef:
          name: cm-appvars
          key: appDataDir

1.4 通过volumeMount方式使用

apiVersion: v1
kind: Pod
metadata:
  name: cm-test-app
spec:
  containers:
  - name: cm-test-app
    image: kubeguide/tomcat-app:v1
    ports:
    - containerPort: 80
    volumeMounts:
    - name: v-serverxml #引用的volume名
      mountPath: /configs
  volumes:
  - name: v-serverxml
    configMap:
      name: cm-appconfigfiles #使用这个名字的cm
      items:
      - key: key-svr-xml
        path: server.xml
      - key: key-log4j-pro
        path: logging.properties

登陆容器，看/configs目录下是否有2个文件server.xml和logging.properties

kubectl exec -it cm-test-app -- bash
cd /configs
ls -l