127 lines
3.0 KiB
Markdown
127 lines
3.0 KiB
Markdown
---
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approvers:
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- eparis
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- pmorie
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title: 使用ConfigMap来配置Redis
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content_template: templates/tutorial
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---
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{{% capture overview %}}
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这篇文档基于[使用ConfigMap来配置Containers](/docs/tasks/configure-pod-container/configure-pod-configmap/) 这个任务，提供了一个使用ConfigMap来配置Redis的真实案例。
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{{% /capture %}}
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{{% capture objectives %}}
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* 创建一个ConfigMap。
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* 使用ConfigMap来配置pod参数。
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* 创建pod。
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* 验证是否配置成功。
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{{% /capture %}}
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{{% capture prerequisites %}}
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* {{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
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* 理解[使用ConfigMap来配置Containers](/docs/tasks/configure-pod-container/configure-pod-configmap/)。
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{{% /capture %}}
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{{% capture lessoncontent %}}
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## 真实世界的案例：使用ConfigMap来配置Redis
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按照下面的步骤，您可以使用ConfigMap中的数据来配置Redis缓存。
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1. 根据`docs/user-guide/configmap/redis/redis-config`来创建一个ConfigMap：
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```shell
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kubectl create configmap example-redis-config --from-file=docs/user-guide/configmap/redis/redis-config
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kubectl get configmap example-redis-config -o yaml
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```
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```yaml
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apiVersion: v1
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data:
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redis-config: |
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maxmemory 2mb
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maxmemory-policy allkeys-lru
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kind: ConfigMap
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metadata:
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creationTimestamp: 2016-03-30T18:14:41Z
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name: example-redis-config
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namespace: default
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resourceVersion: "24686"
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uid: 460a2b6e-f6a3-11e5-8ae5-42010af00002
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```
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1. 使用ConfigMap来配置pod参数：
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```yaml
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apiVersion: v1
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kind: Pod
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metadata:
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name: redis
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spec:
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containers:
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- name: redis
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image: kubernetes/redis:v1
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env:
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- name: MASTER
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value: "true"
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ports:
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- containerPort: 6379
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resources:
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limits:
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cpu: "0.1"
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volumeMounts:
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- mountPath: /redis-master-data
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name: data
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- mountPath: /redis-master
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name: config
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volumes:
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- name: data
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emptyDir: {}
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- name: config
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configMap:
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name: example-redis-config
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items:
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- key: redis-config
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path: redis.conf
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```
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1. 创建pod:
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```shell
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kubectl create -f docs/user-guide/configmap/redis/redis-pod.yaml
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```
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In the example, the config volume is mounted at `/redis-master`.
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It uses `path` to add the `redis-config` key to a file named `redis.conf`.
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The file path for the redis config, therefore, is `/redis-master/redis.conf`.
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This is where the image will look for the config file for the redis master.
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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：
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```shell
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kubectl exec -it redis redis-cli
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127.0.0.1:6379> CONFIG GET maxmemory
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1) "maxmemory"
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2) "2097152"
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127.0.0.1:6379> CONFIG GET maxmemory-policy
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1) "maxmemory-policy"
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2) "allkeys-lru"
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```
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{{% capture whatsnext %}}
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* 了解关于[ConfigMaps](/docs/tasks/configure-pod-container/configure-pod-configmap/)的更多知识。
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{{% /capture %}}
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