Compose: Error: could not translate host name "postgres" to address: Name or service not known

[mfbmina]

I'm having issues when using volumes and postgres.

The error is: could not translate host name "postgres" to address: Name or service not known
My config files: https://gist.github.com/mfbmina/5defa6f610d9818e3d4dc666ff55cc06
Docker version: Docker version 17.06.0-ce, build 02c1d87
docker-compose version: docker-compose version 1.15.0, build unknown
OS: macOS Sierra, 10.12.6

When I remove volumes from docker-compose.yml it works fine, but do not persists my data.

[shin-]

Read this: https://docs.docker.com/compose/startup-order/

[mfbmina]

Hey @shin- , I don't know how this article can help me.

[shin-]

Your app assumes that it will always be able to immediately discover and connect to the database. The article I linked explains why that's a bad assumption and what can/should be done to fix it.

[edwardoliveira]

@shin sorry for bringing this issue again one year later, but this is biting here. In our case the database starts first, the web app depends on database in docker-compose. And everything works for a while, but a few minutes after starting the webapp just cannot resolve the host name.

The webapp and DB are running on different machines via Rancher, that uses Docker-compose. We have a bunch of instances of this system but looks like only a few are showing this behavior.

[shin-]

Connection issues are not really in the realm of Compose. You probably want to report this on the Rancher repo.

[edwardoliveira]

Ops, sorry about that. Gonna do that. Thanks!