Hi there! i'm selfhosted supabase by docker. Docker always spams error

"supabase-realtime  | 2022-03-11 16:38:34.261 [error] Postgrex.Protocol (#PID<0.232.0>) failed to connect: ** (DBConnection.ConnectionError) tcp connect (db:5432): non-existing domain - :nxdomain"

.

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The most common reason I've found for this is that the docker containers aren't on the same network. The default

bridge

network is what connects Docker to the outside, and Supabase has its own network. If they're on the same network, try assigning the hostname

db

to the postgres container and then restarting both realtime and postgres containers

How can i do that?

I install Portainer which lets me manage containers more easily (recommended), but there's a few alternative solutions at https://serverfault.com/questions/716719/how-do-i-change-docker-host-name-after-the-image-creation

so when i install it in portainer it will works?

Inside the postgres container settings, go to the bottom of the page and choose the network tab. Hostname should be

db

. If that doesn't work, try

supabase-db

@User

i'm new in portainer and i dont know how to create it

How are you setting up your docker containers?

i'm nothing changed

You haven’t outlined how you are creating your containers. Is there a guide you are following?

yeah, official supabase docker guide

I’ll have to test this out to see the results I get, I normally run the local copy using the Supabase cli so haven’t seen this error before

Supabase CLI?

I've now set this up and I'm not running into the issue you are having. Was there anything specific that you did to get that error?

Em... Nothing. I'm just created it with this tutorial. Now i will test disable firewall and create it full via portianer

Can we stick to one issue at a time in this thread? I've now run the docker-compose on a separate system and still can't duplicate the issue you are having. Is there a docker desktop on Linux? if yes can you check how many containers running postgres you have going.

It's ubuntu server, so i dont have UI (if u thinking about this). On docker container ls / docker-compose ls nothing is running (without portainer)

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oh... still not working

I will have to try spinning up a ubuntu server to see if I can replicate your issue

okay

I’m having the exact same problem. According to someone from supabase. the issue is there is no db-connection. I don’t know why that is, or how to do connect the db yet.