Install Redis 6.2 Inside Centos 7 Docker Container

You'd think this would be easy, but like everything else there are some tricks.

Here's what I did for my docker-compose.

NOTE: That this is not the latest Redis but 6.2 is my current requirements so here we go.

version: '3.7'
services:
  redis:
    image: redis:6.2
    environment:
      - ALLOW_EMPTY_PASSWORD=yes
    sysctls:
      - net.core.somaxconn=511
    volumes:
      - $PWD/redis-data:/var/lib/redis

This solves a bunch of problems all ready:

Setting environment variables gets us up faster.
Need to do some sysctl magic to get things working.
Mounting external volume allows us to persist Redis data.

Bring it up:

docker-compose up redis

Of course, there's all ready issues:

Starting containers-2891_redis_1 ... done
Attaching to containers-2891_redis_1
redis_1  | 1:C 20 Jan 2023 01:50:54.485 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
redis_1  | 1:C 20 Jan 2023 01:50:54.485 # Redis version=6.2.10, bits=64, commit=00000000, modified=0, pid=1, just started
redis_1  | 1:C 20 Jan 2023 01:50:54.485 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
redis_1  | 1:M 20 Jan 2023 01:50:54.485 * monotonic clock: POSIX clock_gettime
redis_1  | 1:M 20 Jan 2023 01:50:54.486 * Running mode=standalone, port=6379.
redis_1  | 1:M 20 Jan 2023 01:50:54.486 # Server initialized
redis_1  | 1:M 20 Jan 2023 01:50:54.487 # Can't handle RDB format version 10
redis_1  | 1:M 20 Jan 2023 01:50:54.487 # Fatal error loading the DB: Invalid argument. Exiting.

Starting the redis-server explicitly seems to work:

version: '3.7'
services:
  redis:
    image: redis:6.2
    command: ["redis-server", "--appendonly", "yes"]
    environment:
      - ALLOW_EMPTY_PASSWORD=yes
    sysctls:
      - net.core.somaxconn=511
    volumes:
      - $PWD/redis-data:/var/lib/redis