Redis

• Source: https://github.com/redis/redis
• License: BSD-3 (v7.2 and earlier) / RSALv2/SSPL (v7.4+)
• Alternatives: Valkey, Dragonfly, Memcached

In-memory database used for caching and message queuing.

To avoid network traffic/delays, run Redis on the same server as the containers that require it (one instance per server).