---
approvers:
- eparis
- pmorie
title: Configuring Redis using a ConfigMap
---

{% capture overview %}

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. 

{% endcapture %}

{% capture objectives %}

* Create a ConfigMap.
* Create a pod specification using the ConfigMap.
* Create the pod.
* Verify that the configuration was correctly applied.

{% endcapture %}

{% capture prerequisites %}

* {% include task-tutorial-prereqs.md %}
* Understand [Using ConfigMap Data in Pods](/docs/tasks/configure-pod-container/configure-pod-configmap/).
* Understand [Configure Containers Using a ConfigMap](/docs/tasks/configure-pod-container/configmap/).

{% endcapture %}

{% capture lessoncontent %}


## Real World Example: Configuring Redis using a ConfigMap

You can follow the steps below to configure a Redis cache using data stored in a ConfigMap.

1. Create a ConfigMap from the `docs/user-guide/configmap/redis/redis-config` file:

   ```shell
   kubectl create configmap example-redis-config --from-file=docs/user-guide/configmap/redis/redis-config

   kubectl get configmap example-redis-config -o yaml
   ```

   ```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. Create a pod specification that uses the config data stored in the ConfigMap:

   ```yaml
   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. Create the pod:

   ```shell
   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. Use `kubectl exec` to enter the pod and run the `redis-cli` tool to verify that the configuration was correctly applied:

   ```shell
   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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{% capture whatsnext %}

* Learn more about [ConfigMaps](/docs/tasks/configure-pod-container/configmap/).
* See [Using ConfigMap Data in Pods](/docs/tasks/configure-pod-container/configure-pod-configmap).

{% endcapture %}

{% include templates/tutorial.md %}
