PostgreSQL docker image based on Alpine Linux

This repo builds a docker image that accepts the same env vars as the official postgres build but with a much smaller footprint. It achieves that by basing itself off the great alpine docker image by GliderLabs.

Why?

$ docker images
REPOSITORY          TAG         VIRTUAL SIZE
alpine-postgres     latest      27.7 MB
postgres            latest      213.9 MB

Build

$ make build