Dockerizing CI environments blog post

docker-compose.yml

api:
  build: .
  ports:
   - "8000:80"
  expose:
  - "80"

test:
  build: test
  command: dockerize -wait http://api:80 go test -v ./...
  links:
    - api:api

Dockerfile

RUN apt-get update && apt-get install -y wget
RUN wget https://github.com/jwilder/dockerize/releases/download/v0.1.0/dockerize-linux-amd64-v0.1.0.tar.gz
RUN tar -C /usr/local/bin -xzvf dockerize-linux-amd64-v0.1.0.tar.gz

dockerize

dockerize -wait tcp://web:80 -wait http://web:80

wait-for-x.sh

    echo ">> Waiting for postgres to start"
    WAIT=0
    while ! nc -z $POSTGRES_HOST 5432; do
      sleep 1
      WAIT=$(($WAIT + 1))
      if [ "$WAIT" -gt 15 ]; then
        echo "Error: Timeout wating for Postgres to start"
        exit 1
      fi
    done