mkdir should work on /run instead of /var/run

[deinspanjer]

In debian:jessie, /var/run is a symlink to /run. The docker file creates the postgresql directory under /var/run, but the docker-entrypoint.sh file also tries to make /run/postgresql and chown that as well.

[tianon]

Since this technically works either way (given that /var/run is a symlink to /run), I think I'd prefer to stick to whichever of the paths PostgreSQL itself is trying to use -- does it use /var/run/postgres (relying on the symlink), or does it use /run directly?

(Also, this change would need to happen in Dockerfile.template and be propagated to all the versions from there. 👍)

[deinspanjer]

Okay, I ran the container and then exec'ed a bash shell and poked around with lsof. It looks like the generated config is using /var/run for the socket connection and postmaster is using it for the pid, so this should probably stay the way it is for now. :/

[tianon]

Thanks for doing the additional research! 👍 ❤️