kubernetes配置管理中的ConfigMap

kubernetes配置管理中的ConfigMap

ConfigMap 是一种 API 对象，用来将非机密性的数据保存到健值对中。使用时可以用作环境变量、命令行参数或者存储卷中的配置文件。

ConfigMap 将您的环境配置信息和 容器镜像 解耦，便于应用配置的修改。当您需要储存机密信息时可以使用 Secret 对象。

ConfigMap 和 Secret 同为配置管理中的传参内容，但是 ConfigMap 的数据为明文传输，而 Secret 的数据是 base64 加密以后的传参过程；

使用 ConfigMap 将配置数据和应用程序代码分开。

首先定义一个 configmap 类型配置信息，采用键值对，然后我们用 pod 根据 valueFrom.configMapKeyRef 字段引用 configmap 中定义的键值对。

k8s官方文档地址：secret]# vim configmap1.yaml [root@master1 secret]# cat configmap1.yaml apiVersion: v1 kind: ConfigMap metadata: name: myconfig namespace: default data: special.level: info special.type: hello --- 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@master1 secret]# kubectl apply -f configmap1.yaml configmap/myconfig created pod/mypod created [root@master1 secret]# kubectl get pods NAME READY STATUS RESTARTS AGE mypod 0/1 Completed 0 20s nginx-deployment-9cdc9bd5c-pzzst 1/1 Running 1 3d14h secret-env-pod 1/1 Running 0 37m web-nginx-dep2-66ccfd7fb7-z2x84 1/1 Running 1 8d [root@master1 secret]# kubectl get cm NAME DATA AGE myconfig 2 7m30s [root@master1 secret]# kubectl describe cm myconfig Name: myconfig Namespace: default Labels: Annotations: kubectl.kubernetes.io/last-applied-configuration: {"apiVersion":"v1","data":{"special.level":"info","special.type":"hello"},"kind":"ConfigMap","metadata":{"annotations":{},"name":"myconfig... Data ==== special.level: ---- info special.type: ---- hello Events: # 通过查看日志得到我们定义的configmap配置管理信息 [root@master1 secret]# kubectl logs mypod info hello

通过 configmap 定义一个redis的配置文件；

[root@master1 secret]# vim configmap2.yaml [root@master1 secret]# cat configmap2.yaml apiVersion: v1 kind: ConfigMap metadata: name: redis-config data: redis.properties: | redis.host=127.0.0.1 redis.port=6379 redis.password=123456 --- 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@master1 secret]# kubectl apply -f configmap2.yaml configmap/redis-config created pod/mypod created [root@master1 secret]# kubectl get cm NAME DATA AGE redis-config 1 7s [root@master1 secret]# kubectl describe cm redis-config Name: redis-config Namespace: default Labels: Annotations: kubectl.kubernetes.io/last-applied-configuration: {"apiVersion":"v1","data":{"redis.properties":"redis.host=127.0.0.1\nredis.port=6379\nredis.password=123456\n"},"kind":"ConfigMap","metada... Data ==== redis.properties: ---- redis.host=127.0.0.1 redis.port=6379 redis.password=123456 Events: [root@master1 secret]# kubectl get pods NAME READY STATUS RESTARTS AGE mypod 0/1 Completed 0 49s nginx-deployment-9cdc9bd5c-pzzst 1/1 Running 1 3d15h secret-env-pod 1/1 Running 0 48m web-nginx-dep2-66ccfd7fb7-z2x84 1/1 Running 1 8d [root@master1 secret]# kubectl logs mypod redis.host=127.0.0.1 redis.port=6379 redis.password=123456

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