Kubernetes(K8S) 配置管理-ConfigMap 介绍

作用：存储不加密数据到 etcd，让 Pod 以变量或者 Volume 挂载到容器中
场景：配置文件

创建配置文件

redis.properties

redis.host=127.0.0.1
redis.port=6379
redis.password=123456

创建 ConfigMap

# 根据 redis.properties 创建 redis-config 
[root@k8smaster ~]# kubectl create configmap redis-config --from-file=redis.properties
# 查看 configmap
[root@k8smaster ~]# kubectl get cm
# 查看 redis-config 的详情
[root@k8smaster ~]# kubectl describe cm redis-config

以 Volume 的形式进行挂载到 pod 容器中

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

# 创建 yaml文件
[root@k8smaster ~]# vi cm.yaml
# 创建pod
[root@k8smaster ~]# kubectl apply -f cm.yaml
# 启动后可以查看日志
[root@k8smaster ~]# kubectl logs mypod

以变量的形式进行挂载

创建 yaml，声明变量信息 configmap 创建
myconfig.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: myconfig
  namespace: default
data:
  special.level: info
  special.type: hello 

config-var.yaml

apiVersion: v1
kind: Pod
metadata:
  name: mypod
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

[root@k8smaster ~]# vi myconfig.yaml
[root@k8smaster ~]# kubectl apply -f myconfig.yaml
# 以变量形式进行挂载
[root@k8smaster ~]# vi config-var.yaml
[root@k8smaster ~]# kubectl apply -f config-var.yaml