Nextcloud: Redis server went away

This can happen when the Redis environment is configured incorrectly, and/or when the redis-server.sock file has the wrong permissions.

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By. Jacob

Created: 2023-09-25 22:22

RedisException: Redis server went away

On my Nextcloud server I was getting an error like this. It can happen after updating server software or changing servers. A common cause for it is that you forgot to install Redis, or you did not configure Redis properly.

Verify that your Redis redis-server.sock file has the right permissions, and that your www-data user is added to the redis group. E.g:

1. Setup Redis to use redis-server.sock with the right permissions. Edit your /etc/redis.conf file like this:

unixsocket /var/run/redis/redis-server.sock
unixsocketperm 775

2. (If needed), verify your Nextcloud configuration file is pointing at the Redis .sock file; Debian/Ubuntu might keep create the file in:

/var/run/redis/redis-server.sock

3. Add the www-data user to the Redis group:

usermod -a -G redis www-data

-a or --append — add the user to the group'(s).

-G or --groups — the group'(s) to add the user to.

4. Restart your server to refresh the group permissions:

sudo reboot now

Also, make sure the php-redis module is installed:

sudo apt install php8.2-redis

Surprisingly, some of the only documentation I found online about this issue were incorrectly telling people to add the redis user to the www-data user group. Don't do that. It's obviously the other way around!