custom_docker_network.yaml

init-db:
    machine: true
    environment:
      - DATABASE_USER: "deployer"
      - RAILS_ENV: "staging"
      - DATABASE_DEPLOYMENT: "deployment/my-postgresql"
      - DATABASE_FORWARD_PORT: 5432
      - DATABASE_PORT: 5432
      - DATABASE_HOST: "postgres_db"
      - GOOGLE_PROJECT_ID: "my_proj"
      - GOOGLE_COMPUTE_ZONE: "my_zone"
      - GOOGLE_CLUSTER_NAME: "my-cluster"
      - DOCKER_NET: "db-net"
    steps:
      - checkout
      - run:
          name: Login to docker registry
          command: |
            echo "$GCLOUD_SERVICE_KEY" | docker login -u _json_key --password-stdin https://gcr.io
      - run:
          name: Create docker network
          command: |
            docker network create "$DOCKER_NET"
      - run:
          name: Launch Postgres
          command: |
            docker run --rm \
            -e GCLOUD_SERVICE_KEY="$GCLOUD_SERVICE_KEY" \
            -e GOOGLE_PROJECT_ID="$GOOGLE_PROJECT_ID" \
            -e GOOGLE_COMPUTE_ZONE="$GOOGLE_COMPUTE_ZONE" \
            -e GOOGLE_CLUSTER_NAME="$GOOGLE_CLUSTER_NAME" \
            -e DATABASE_FORWARD_PORT="$DATABASE_FORWARD_PORT" \
            -e DATABASE_PORT="$DATABASE_PORT" \
            -e DATABASE_DEPLOYMENT="$DATABASE_DEPLOYMENT" \
            --name "$DATABASE_HOST" \
            -p 5432:5432 \
            --network="$DOCKER_NET" \
            --entrypoint "/bin/bash" \
            gcr.io/my-build/deploy_machine:latest -c "/scripts/db_connect.sh && sleep infinity"
          background: true
      - run:
          name: Create DB
          command: |
            docker run \
            -e RAILS_MASTER_KEY=$RAILS_MASTER_KEY \
            -e RAILS_ENV=$RAILS_ENV \
            -e DATABASE_USER=$DATABASE_USER \
            -e DATABASE_FORWARD_PORT=$DATABASE_FORWARD_PORT \
            -e DATABASE_PORT=$DATABASE_PORT \
            -e DATABASE_HOST=$DATABASE_HOST \
            -e CIRCLE_BRANCH=$CIRCLE_BRANCH \
            -e CIRCLE_PROJECT_REPONAME=$CIRCLE_PROJECT_REPONAME \
            --network="$DOCKER_NET" \
            --link "$DATABASE_HOST" \
            --entrypoint="/bin/bash" \
            gcr.io/my-build/my_proj:latest \
            -c "cd /app && ./scripts/init_db.sh"