学习 Kubernetes 基础知识

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使用ConfigMap来配置Redis

这篇文档基于使用ConfigMap来配置Containers 这个任务，提供了一个使用ConfigMap来配置Redis的真实案例。

教程目标

准备开始

To check the version, enter kubectl version.

真实世界的案例：使用ConfigMap来配置Redis

按照下面的步骤，您可以使用ConfigMap中的数据来配置Redis缓存。

  1. 根据docs/user-guide/configmap/redis/redis-config来创建一个ConfigMap：
   kubectl create configmap example-redis-config --from-file=docs/user-guide/configmap/redis/redis-config

   kubectl get configmap example-redis-config -o yaml
   apiVersion: v1
   data:
     redis-config: |
       maxmemory 2mb
       maxmemory-policy allkeys-lru
   kind: ConfigMap
   metadata:
     creationTimestamp: 2016-03-30T18:14:41Z
     name: example-redis-config
     namespace: default
     resourceVersion: "24686"
     selfLink: /api/v1/namespaces/default/configmaps/example-redis-config
     uid: 460a2b6e-f6a3-11e5-8ae5-42010af00002
  1. 使用ConfigMap来配置pod参数：
   apiVersion: v1
   kind: Pod
   metadata:
     name: redis
   spec:
     containers:
     - name: redis
       image: kubernetes/redis:v1
       env:
       - name: MASTER
         value: "true"
       ports:
       - containerPort: 6379
       resources:
         limits:
           cpu: "0.1"
       volumeMounts:
       - mountPath: /redis-master-data
         name: data
       - mountPath: /redis-master
         name: config
     volumes:
       - name: data
         emptyDir: {}
       - name: config
         configMap:
           name: example-redis-config
           items:
           - key: redis-config
             path: redis.conf
  1. 创建pod:
   kubectl create -f docs/user-guide/configmap/redis/redis-pod.yaml

In the example, the config volume is mounted at /redis-master. It uses path to add the redis-config key to a file named redis.conf. The file path for the redis config, therefore, is /redis-master/redis.conf. This is where the image will look for the config file for the redis master.

  1. 使用kubectl exec命令进入pod后运行 redis-cli 工具来验证配置是否成功：
   kubectl exec -it redis redis-cli
   127.0.0.1:6379> CONFIG GET maxmemory
   1) "maxmemory"
   2) "2097152"
   127.0.0.1:6379> CONFIG GET maxmemory-policy
   1) "maxmemory-policy"
   2) "allkeys-lru"

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