129 lines
3.5 KiB
Markdown
129 lines
3.5 KiB
Markdown
---
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approvers:
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- eparis
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- pmorie
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title: Configuring Redis using a ConfigMap
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---
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{% capture overview %}
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This page provides a real world example of how to configure Redis using a ConfigMap and builds upon the [Using ConfigMap Data in Pods](/docs/tasks/configure-pod-container/configure-pod-configmap/) and [Configure Containers Using a ConfigMap](/docs/tasks/configure-pod-container/configmap/) tasks.
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{% endcapture %}
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{% capture objectives %}
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* Create a ConfigMap.
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* Create a pod specification using the ConfigMap.
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* Create the pod.
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* Verify that the configuration was correctly applied.
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{% endcapture %}
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{% capture prerequisites %}
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* {% include task-tutorial-prereqs.md %}
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* Understand [Using ConfigMap Data in Pods](/docs/tasks/configure-pod-container/configure-pod-configmap/).
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* Understand [Configure Containers Using a ConfigMap](/docs/tasks/configure-pod-container/configmap/).
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{% endcapture %}
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{% capture lessoncontent %}
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## Real World Example: Configuring Redis using a ConfigMap
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You can follow the steps below to configure a Redis cache using data stored in a ConfigMap.
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1. Create a ConfigMap from the `docs/user-guide/configmap/redis/redis-config` file:
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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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selfLink: /api/v1/namespaces/default/configmaps/example-redis-config
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uid: 460a2b6e-f6a3-11e5-8ae5-42010af00002
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```
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1. Create a pod specification that uses the config data stored in the ConfigMap:
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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. Create the 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. Use `kubectl exec` to enter the pod and run the `redis-cli` tool to verify that the configuration was correctly applied:
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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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{% endcapture %}
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{% capture whatsnext %}
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* Learn more about [ConfigMaps](/docs/tasks/configure-pod-container/configmap/).
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* See [Using ConfigMap Data in Pods](/docs/tasks/configure-pod-container/configure-pod-configmap).
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{% endcapture %}
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{% include templates/tutorial.md %}
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