Question Redis in docker act as a not persisted cache

[MaartenW]

Server operating system version

Ubuntu 18.04.6 LTS

Plesk version and microupdate number

Plesk Obsidian 18.0.56

Hello, I have installed the Redis instance in Docker, but I want to edit the configuration so it only runs in RAM instead of disk. But I cannot find a configuration file for redis. Does anyone know how to configure that?

 

[Kaspar]

Perhaps this helps: Docker Stack/Compose Redis Instance Not Persisting Data

 

[MaartenW]

Thank you for your answer, but I cannot find a solution for this question there. The Redis instance runs ok, but in I cannot find a way to configure it to use it a memory only cache instead of it writing to disk. You can configure this in the redis .config file, but I cannot find this anywhere.

 

[Kaspar]

Ah, sorry, I misunderstood your question. In turn I think you probably misunderstand what Redis actually is and what it does. The Redis website explains it as:

Redis is an in-memory but persistent on disk database, [...] data served from memory, disk used for storage.

Meaning that Redis keeps datasets entirely in memory, but also writes those to disk for storage (to be persistent). There is no additional configuration needed to store data in memory, because thats what Redis does by default.

 

[Spring]

I'm also interested in this topic. I only want to use the RAM (but not the disk).

The default-setting of Redis is the snapshotting, where the RAM is written on the disk: Redis persistence

But through the redis.conf (redis/redis.conf at unstable · redis/redis), it is possible to deactivate that snapshotting:
# Snapshotting can be completely disabled with a single empty string argument
# as in following example:
#
# save ""

Is there an option, when Redis is installed via Plesk's docker-extension, to disable this snapshotting via the Plesk-interface?

I found the following - but it doesn't work (setting for the environment variables):
REDIS_ARGS --save 86400 1

Are there maybe similiar approaches that work?