Docker & Postgres: Failed to bind tcp 0.0.0.0:5432

Question

Problem

I'm trying to start postgres in a docker container on my Mac, but I keep getting the following error message

docker: Error response from daemon: driver failed programming external connectivity on endpoint postgres (8392b9e5cfaa28f480fe1009dee461f97e82499726f4afc4e916358dd2d2f61e): Error starting userland proxy: Failed to bind tcp 0.0.0.0:5432 address already in use.

I have postgres installed locally, but I stopped it and running

pg_ctl status

returns

pg_ctl: no server running

I've ran the following to check what's running on 5432

lsof -i tcp:5432

&

netstat -anp tcp | grep 5432

and nothing is running on the port.

Versions

Mac - OS X El Capitan Version 10.11.2

PostgreSQL - 9.5

Docker - Docker version 1.12.0-rc2, build 906eacd, experimental

Answer 1

lsof -i :5432

It seems that docker (1.12.0-rc3-beta18) is using an instance of postgres for something (I killed the service and it forced docker to restart). To fix it, I changed my docker-compose ports section from 5432:5432 to just 5432 and let docker choose the port automatically.