common.yml

version: '2'
services:
  zuul-base:
    build:
      context: ../
      dockerfile: docker/Dockerfile
    volumes:
      - "./etc:/etc/zuul"

docker-compose.yml

version: '2'
services:
  zuul-server:
    extends:
      file: common.yml
      service: zuul-base
    command: zuul-server -d -c /etc/zuul/zuul.conf
    expose:
      - 8001
      - 36724
    volumes:
      - "./ssh:/var/lib/zuul/.ssh"
  zuul-merger:
    extends:
      file: common.yml
      service: zuul-base
    command: zuul-merger -d -c /etc/zuul/zuul.conf
    depends_on:
      - zuul-server
    volumes:
      - "./ssh:/var/lib/zuul/.ssh"

Dockerfile

FROM ubuntu:latest
MAINTAINER Jamie Lennox <jamielennox@gmail.com>

RUN apt-get update && \
    apt-get install -y gcc git python2.7 python2.7-dev wget && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/* && \
    wget -O- https://bootstrap.pypa.io/get-pip.py | python2.7

RUN groupadd -r zuul && \
    useradd -r -g zuul -d /var/lib/zuul -m zuul && \
    mkdir /var/log/zuul /var/lib/zuul/state /var/lib/zuul/merger && \
    chown -R zuul: /var/log/zuul /var/lib/zuul/

VOLUME ["/etc/zuul"]

ADD . /opt/zuul
RUN pip install -e /opt/zuul/

USER zuul