Anything about running your own Lemmy instance. Including how to install it, maintain and customise it.
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Considering you are getting No such file or directory error then
The path is correct, my investigations directed me towards a docker access issue as suggested by your #2. Looking into it now, thanks!
If lemmy is actually running in docker then you should rather use network instead of socket file - while it should work I would be afraid of docker shenanigans when it comes to mounting a socket file as volume into the container (it should work, but ...).
You should be able to access postgres over network on the host thru extra_hosts settings:
extra_hosts:
- "host.docker.internal:host-gateway"
https://stackoverflow.com/a/43541732
postgres://host.docker.internal:5432
My investigations so far have led me to the conclusion that the Ansible install creates multiple docker containers, including one for Lemmy and one for Postgresql. I need now to figure out how inter-container communications work but the host itself is not used.
Ah right, I assumed you were trying to connect the lemmy container to postgres running outside of docker.
One important thing to remember with all docker compose files - the service name (the first keys in the services: configuration) is also the hostname of that container so to ping lemmy (from some other container in that docker compose) you would do ping lemmy, same for postgres ping postgres - but if the postgres service was named db0 then it would be ping db0.
You also do not have to expose ports - all containers in that compose share one network (exposing is for outside access).
All together your postgres config for lemmy should like this:
database: {
# name of the postgres database for lemmy
database: "lemmy"
# username to connect to postgres
user: "postgres"
# password to connect to postgres
password: "xxxxxxx"
# host where postgres is running
host: "postgres"
# port where postgres can be accessed
port: 5432
# maximum number of active sql connections
pool_size: 10
}
Amazingly helpful, thanks!
Ok, the good news is that it works. The bad news is that I don't understand what changed. 🤨
I don't get what you mean here. Communication over (linux) socket file and TCP/IP is very different.
After reading your comment, I went back to investigate my install. I can't remember having changed anything relevant but Lemmy started to function properly, connecting as it should the database. It's been stable since, even after reboots.
As you suggested, I am using "postgres" as the host, as the service is described in the docker-compose.yml file. The communication is then via TCP/IP and not socket.