fix: actually persist redis data

Redis data was not actually persisted, because the redis configuration file was
not mounted from the right location. In order to mount redis data in a
host-mounted directory, the working directory has to be properly set.

The problem was occurring both with docker-compose and Kubernetes.

Close #404.

CHANGELOG.md

@@ -4,6 +4,8 @@ Note: Breaking changes between versions are indicated by "💥".
 
 ## Unreleased
 
+- [Bugfix] Actually persist Redis data
+
 ## v11.2.0 (2021-02-10)
 
 - [Bugfix] Upgrade all services to open-release/koa.2

tutor/templates/k8s/deployments.yml

@@ -425,6 +425,8 @@ spec:
       containers:
         - name: redis
           image: {{ DOCKER_IMAGE_REDIS }}
+          args: ["redis-server", "/openedx/redis/config/redis.conf"]
+          workingDir: /openedx/redis/data
           ports:
             - containerPort: {{ REDIS_PORT }}
           volumeMounts:

tutor/templates/local/docker-compose.yml

@@ -40,8 +40,9 @@ services:
   {% if RUN_REDIS %}
   redis:
     image: {{ DOCKER_IMAGE_REDIS }}
+    working_dir: /openedx/redis/data
     volumes:
-      - ../../env/redis/redis.conf:/openedx/redis/config/redis.conf:ro
+      - ../apps/redis/redis.conf:/openedx/redis/config/redis.conf:ro
       - ../../data/redis:/openedx/redis/data
     command: redis-server /openedx/redis/config/redis.conf
     restart: unless-stopped