docker-stack.support.yml

---
# support stack (private registry and visualizer services)
# $ docker stack deploy -c docker-stack.support.yml support-stack
version: '3.8'
services:
  # The registry service is only needed when running in a swarm stack
  registry:
    image: registry:2
    ports:
      - "5000:5000"
    volumes:
      - "registry-data:/var/lib/registry"
    deploy:
      placement:
        constraints: [node.labels.registry == true]

# The visualizer was useful when we first started deploying to swarms and the swarms
# had multiple nodes. Now that we've been running the swarm on a single instance
# the visualizer isn't useful. In addition it hasn't been maintained and probably is
# has some security issues. Therefore I'm commenting it out, leaving it just in case
# we want to revive running it for some scenario. - mjl 2021-04-19
#  # The visualizer service is only needed when running in a swarm stack
#  visualizer:
#    image: dockersamples/visualizer:stable
#    ports:
#      - "8080:8080"
#    stop_grace_period: 1m30s
#    volumes:
#      - "/var/run/docker.sock:/var/run/docker.sock"
#    deploy:
#      placement:
#        constraints: [node.role == manager]

volumes:
  registry-data: