Blue/Green deployment (Traefik, docker)

config.env

ENVIRONMENT=dev
OTHER_CONFIG=BLAH

deploy.sh

#!/bin/bash
blue=$(docker ps -f name=blue -q)
if test -z "$blue"
then
    ENV="blue"
    OLD="green"
else
    ENV="green"
    OLD="blue"
fi

echo "Starting "$ENV" container"
docker-compose pull
docker-compose --project-name=$ENV up -d

echo "Waiting..."
sleep 30s

echo "Stopping "$OLD" container"
docker-compose --project-name=$OLD stop

docker-compose.traefik.yml

version: "3"

services: 
    traefik:
        image: "traefik:v2.1"
        restart: unless-stopped
        networks:
            - webgateway
        command:
            - "--api.insecure=true"
            - "--providers.docker=true"
            - "--providers.docker.exposedbydefault=false"
            - "--entrypoints.web.address=:80"
        ports: 
            - "80:80"
            - "8080:8080"
        volumes: 
            - "/var/run/docker.sock:/var/run/docker.sock"
networks:
    webgateway:
        driver: bridge

docker-compose.yml

version: "3"

services: 
    membership-app:
        image: my-app:latest
        labels:
            - "traefik.enable=true"
            - "traefik.http.middlewares.test-retry.retry.attempts=3"
            - "traefik.http.routers.membership.rule=Host(`my-app.com`)"
            - "traefik.http.routers.membership.entrypoints=web"
            - "traefik.http.services.membership.loadbalancer.server.port=8080"
            - "traefik.http.services.membership.loadbalancer.healthCheck.path=/status"
            - "traefik.http.services.membership.loadbalancer.healthCheck.interval=10s"
            - "traefik.http.services.membership.loadbalancer.healthCheck.timeout=1s"
        env_file:
            - config.env
        restart: unless-stopped
        networks:
            - traefik
networks:
    traefik:
        external:
            name: traefik_webgateway