ConfigMap配置管理变量数据卷

快来打我* 2022-10-17 05:56 144阅读 0赞

ConfigMap与Secret用法基本相同，只不过它存储的是非加密数据到etcd,其他pod通过变量或者容器数据卷进行数据挂载读取到该pod容器中。

# 以容器数据卷形式把配置挂载到pod #

创建ConfigMap:

准备一个配置文件(如redis.properties)基于这个配置文件创建ConfigMap

# 基于redis.properties生成cm
    [root@k8smaster ~]# cat redis.properties
    redis.host=127.0.0.1
    redis.port=6379
    redis.password=123456
    
    # 生成ConfigMap
    [root@k8smaster ~]# kubectl create configmap redis-config --from-file=redis.properties
    configmap/redis-config created
    
    # 查看cm
    [root@k8smaster ~]# kubectl get cm
    NAME           DATA   AGE
    redis-config   1      6s
    [root@k8smaster ~]# kubectl describe cm redis-config
    Name:         redis-config
    Namespace:    default
    Labels:       <none>
    Annotations:  <none>
    
    Data
    ====
    redis.properties:
    ----
    redis.host=127.0.0.1
    redis.port=6379
    redis.password=123456
    
    Events:  <none>

基于cm.yaml创建pod进行挂载

[root@k8smaster ~]# cat cm.yaml
    apiVersion: v1
    kind: Pod
    metadata:
      name: mypod
    spec:
      containers:
        - name: busybox
          image: busybox
          command: [ "/bin/sh","-c","cat /etc/config/redis.properties" ]
          volumeMounts:
          - name: config-volume
            mountPath: /etc/config
      volumes:
        - name: config-volume
          configMap:
            name: redis-config
      restartPolicy: Never

[root@k8smaster ~]# kubectl apply -f cm.yaml
    pod/mypod created
    [root@k8smaster ~]# kubectl get pods
    NAME    READY   STATUS              RESTARTS   AGE
    mypod   0/1     ContainerCreating   0          9s
    [root@k8smaster ~]# kubectl get pods
    NAME    READY   STATUS      RESTARTS   AGE
    mypod   0/1     Completed   0          46s

查看日志 配置数据被输出

[root@k8smaster ~]# kubectl logs mypod
    redis.host=127.0.0.1
    redis.port=6379
    redis.password=123456

以变量的形式挂载到容器数据卷

基于my-config.yaml文件创建ConfigMap

[root@k8smaster ~]# cat my-config.yaml
    apiVersion: v1
    kind: ConfigMap
    metadata:
      name: myconfig
      namespace: default
    data:
      special.level: info
      special.type: hello

# 创建configmap
    [root@k8smaster ~]# kubectl apply -f my-config.yaml
    configmap/myconfig created
    
    
    # 查看configmap
    [root@k8smaster ~]# kubectl get cm
    NAME           DATA   AGE
    myconfig       2      67s
    redis-config   1      17m
    
    [root@k8smaster ~]# kubectl describe cm redis-config
    Name:         redis-config
    Namespace:    default
    Labels:       <none>
    Annotations:  <none>
    
    Data
    ====
    redis.properties:
    ----
    redis.host=127.0.0.1
    redis.port=6379
    redis.password=123456
    
    Events:  <none>

基于config-var.yaml创建pod,把配置挂载到这个pod

[root@k8smaster ~]# cat config-var.yaml
    apiVersion: v1
    kind: Pod
    metadata:
      name: mypod1
    spec:
      containers:
        - name: busybox
          image: busybox
          command: [ "/bin/sh", "-c", "echo $(LEVEL) $(TYPE)" ]
          env:
            - name: LEVEL
              valueFrom:
                configMapKeyRef:
                  name: myconfig
                  key: special.level
            - name: TYPE
              valueFrom:
                configMapKeyRef:
                  name: myconfig
                  key: special.type
      restartPolicy: Never

# 创建pod
    [root@k8smaster ~]# kubectl apply -f config-var.yaml
    pod/mypod1 created
    
    # 测试输出日志成功
    [root@k8smaster ~]# kubectl logs mypod1
    info hello