Attaching Docker volumes to an existing application

The previous chapter was focused on a Task Manager application using a Redis database. Being a database, Redis is subject to backups and other disk operations.

Our previous Redis Compose configuration is as follows:

services:
  redis:
    image: redis
    ports:
      - 6379:6379
    labels:
      - com.packtpub.compose.app=task-manager

Redis has various options for persistence options (https://redis.io/topics/persistence). There are options from point-in-time to AOF (Append-Only File)-based persistence. We will focus on the point-in-time snapshot option that Redis provides, and we will use a volume to store those snapshots.

By default, .rdb backups on the Redis Docker image are stored within the /data directory. We will mount a volume to that location.

First, we will create the volume...