k8s configMap使用案例

k8s-configMap使用案例

1. configmap配置文件示例

#### 1.1 configmap示例配置

apiVersion: v1
kind: ConfigMap
metadata:
  name: configmap-demo
data:
  # 类属性键；每一个键都映射到一个简单的值
  abc: "123"
  cde: "456"

  # 类文件键
  redis.properties: |
    port: 6379
    host: 10.100.24.71
    password: 123456

1.2 configmap 的pod配置文件

apiVersion: v1
kind: Pod
metadata:
  name: configmap-demo-pod
spec:
  containers:
    - name: demo
      image: nginx
      env:
        # 定义环境变量
        - name: ABC_NAME # 请注意这里和 ConfigMap 中的键名是不一样的
          valueFrom:
            configMapKeyRef:
              name: configmap-demo           # 这个值来自 ConfigMap
              key: abc # 需要取值的键
        - name: CDE_NAME
          valueFrom:
            configMapKeyRef:
              name: configmap-demo
              key: cde
      volumeMounts:
      - name: config
        mountPath: "/config"
        readOnly: true
  volumes:
    # 你可以在 Pod 级别设置卷，然后将其挂载到 Pod 内的容器中
    - name: config
      configMap:
        # 提供你想要挂载的 ConfigMap 的名字
        name: configmap-demo
        # 来自 ConfigMap 的一组键，将被创建为文件
        items:
        - key: "redis.properties"
          path: "redis.properties"

2. k8s-configMap使用案例

2.1 配置configmap

• 创建configmap路径

  [root@k8s-master ~]# mkdir -p yaml/configmap/
  

• 编写configmap

  [root@k8s-master configmap]# vi configmap.yaml
  [root@k8s-master configmap]# cat configmap.yaml
  apiVersion: v1
  kind: ConfigMap
  metadata:
    name: configmap-demo
  data:
    # 类属性键；每一个键都映射到一个简单的值
    abc: "123"
    cde: "456"
  
    # 类文件键
    redis.properties: |
      port: 6379
      host: 10.100.24.71
      password: 123456
  

• 启动configmap

  [root@k8s-master configmap]# kubectl apply -f configmap.yaml 
  configmap/configmap-demo created	
  

• 验证服务

  [root@k8s-master configmap]# kubectl get -n default configmaps 
  NAME             DATA   AGE
  configmap-demo   3      53s
  

2.2 创建一个configmap的pod应用

• 编写pod的配置文件

  [root@k8s-master configmap]# vim  configmap-pod.yaml
  [root@k8s-master configmap]# cat  configmap-pod.yaml
  apiVersion: v1
  kind: Pod
  metadata:
    name: configmap-demo-pod
  spec:
    containers:
      - name: demo
        image: nginx
        env:
          # 定义环境变量
          - name: ABC_NAME # 请注意这里和 ConfigMap 中的键名是不一样的
            valueFrom:
              configMapKeyRef:
                name: configmap-demo           # 这个值来自 ConfigMap
                key: abc # 需要取值的键
          - name: CDE_NAME
            valueFrom:
              configMapKeyRef:
                name: configmap-demo
                key: cde
        volumeMounts:
        - name: config
          mountPath: "/config"
          readOnly: true
    volumes:
      # 你可以在 Pod 级别设置卷，然后将其挂载到 Pod 内的容器中
      - name: config
        configMap:
          # 提供你想要挂载的 ConfigMap 的名字
          name: configmap-demo
          # 来自 ConfigMap 的一组键，将被创建为文件
          items:
          - key: "redis.properties"
            path: "redis.properties"
  

• 启动配置文件

  [root@k8s-master configmap]# kubectl apply -f configmap-pod.yaml 
  pod/configmap-demo-pod created
  

• 查看服务是否启动

  [root@k8s-master configmap]# kubectl get   pods
  NAME                 READY   STATUS    RESTARTS   AGE
  configmap-demo-pod   1/1     Running   0          2m27s
  

• 验证变量和挂载镜像

  [root@k8s-master configmap]# kubectl exec -it configmap-demo-pod -- /bin/bash
  root@configmap-demo-pod:/# ls /config/
  redis.properties
  root@configmap-demo-pod:/# cat  /config/redis.properties 
  port: 6379
  host: 10.100.24.71
  password: 123456
  root@configmap-demo-pod:/# env                           
  KUBERNETES_SERVICE_PORT_HTTPS=443
  KUBERNETES_SERVICE_PORT=443
  CDE_NAME=456
  HOSTNAME=configmap-demo-pod
  PWD=/
  PKG_RELEASE=1~buster
  HOME=/root
  KUBERNETES_PORT_443_TCP=tcp://10.96.0.1:443
  NJS_VERSION=0.5.0
  TERM=xterm
  SHLVL=1
  KUBERNETES_PORT_443_TCP_PROTO=tcp
  KUBERNETES_PORT_443_TCP_ADDR=10.96.0.1
  KUBERNETES_SERVICE_HOST=10.96.0.1
  KUBERNETES_PORT=tcp://10.96.0.1:443
  KUBERNETES_PORT_443_TCP_PORT=443
  ABC_NAME=123
  PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
  NGINX_VERSION=1.19.6
  _=/usr/bin/env