Zero downtime deployment reproduction using traefik

docker-compose.yml

version: "3"

services:
  traefik:
    image: "traefik:v2.2"
    ports:
      - "80:80"
      - "8080:8080"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock:ro"
    command:
      - "--providers.docker=true"
      - "--api.insecure=true"
      - "--entryPoints.web.address=:80"
      - "--serversTransport.forwardingTimeouts.dialTimeout=1s"
      - "--serversTransport.forwardingTimeouts.responseHeaderTimeout=5s"
  nginx-blue:
    image: "nginx:alpine"
    stop_signal: SIGQUIT
    labels:
      - "traefik.http.routers.nginx-bg.rule=Host(`localhost`)"
      - "traefik.http.routers.nginx-bg.middlewares=nginx-retry"
      - "traefik.http.services.nginx-bg.loadbalancer.server.port=80"
      - "traefik.http.middlewares.nginx-retry.retry.attempts=4"
  nginx-green:
    image: "nginx:alpine"
    stop_signal: SIGQUIT
    labels:
      - "traefik.http.routers.nginx-bg.rule=Host(`localhost`)"
      - "traefik.http.routers.nginx-bg.middlewares=nginx-retry"
      - "traefik.http.services.nginx-bg.loadbalancer.server.port=80"
      - "traefik.http.middlewares.nginx-retry.retry.attempts=4"