k8s系列之：数据卷挂载ConfigMap

创建ConfigMap后，数据实际会存储在K8s中Etcd，然后通过创建Pod时引用该数据

应用场景：应用程序配置

Pod使用configmap数据有两种方式

变量注入
数据卷挂载

例子：

Step1:创建ConfigMap[configMap.yaml]和Pod[configMap-pod.yaml]

shell>vim configMap.yaml
#####内容如下：#########
apiVersion: v1
kind: ConfigMap
metadata:
  name: configmap-demo
data:
  abc: "123"
  cde: "456"
  redis.properties: |
    port: 6379
    host: 192.168.31.18

shell>vim configMap-pod.yaml
########内容如下############
apiVersion: v1
kind: Pod
metadata:
  name: configmap-demo-pod
spec:
  containers:
    - name: demo
      image: nginx
      env:
        - name: ABCD
          valueFrom:
            configMapKeyRef:
              name: configmap-demo
              key: abc
        - name: CDEF
          valueFrom:
            configMapKeyRef:
              name: configmap-demo
              key: cde
      volumeMounts:
      - name: config
        mountPath: "/config"
        readOnly: true
  volumes:
    - name: config
      configMap:
        name: configmap-demo
        items:
        - key: "redis.properties"
          path: "redis.properties"

shell>kubectl apply -f configMap-pod.yaml

Step2:查看设置的configmap

shell>kubectl get configmap -n default

step3：可以进去pod里面查看变量

[root@master ~]# shell>kubectl get pod
NAME                           READY   STATUS    RESTARTS   AGE
configmap-demo-pod             1/1     Running   0          3m25s
hello-deploy-fd94d7fff-nvspn   1/1     Running   2          2d4h

############进入对应的pod中########################
[root@master ~]# shell>kubectl exec -it configmap-demo-pod -- bash
###输出变量
shell>echo $ABCD
shell>cat /config/redis.properties
#################################################################
# root@configmap-demo-pod:/# cat /config/redis.properties
# port: 6379
# host: 192.168.31.10
#################################################################
shell>env

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