学习 Kubernetes 基础知识

教程

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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

  2. 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

  3. 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"

接下来

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