Study memo of docker swarm

1. Docker swarm init 

$ docker swarm init --advertise-addr $(host -i)
docker swarm init --advertise-addr $(hostname -i)
Swarm initialized: current node (s19krjqmzoz0zozspjszjojdk) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-589slthktmh85s376jqypz4qtt8qyj7nbpjj6i840sgm0nfo2m-87sdp1mneat2kxiwo6tblag3c 192.168.0.13:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
   

2. Docker node ls

$ docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
s19krjqmzoz0zozspjszjojdk *   node1               Ready               Active              Leader              19.03.11   

3. Docker stack deploy

$ docker stack deploy --help 
Usage:  docker stack deploy [OPTIONS] STACK

Deploy a new stack or update an existing stack

Aliases:
  deploy, up

Options:
      --bundle-file string     Path to a Distributed Application Bundle file
  -c, --compose-file strings   Path to a Compose file, or "-" to read from stdin
      --orchestrator string    Orchestrator to use (swarm|kubernetes|all)
      --prune                  Prune services that are no longer referenced
      --resolve-image string   Query the registry to resolve image digest and supported platforms
                               ("always"|"changed"|"never") (default "always")
      --with-registry-auth     Send registry authentication details to Swarm agents

3. Docker stack deploy

$ docker stack deploy --help 
Usage:  docker stack deploy [OPTIONS] STACK

Deploy a new stack or update an existing stack

Aliases:
  deploy, up

Options:
      --bundle-file string     Path to a Distributed Application Bundle file
  -c, --compose-file strings   Path to a Compose file, or "-" to read from stdin
      --orchestrator string    Orchestrator to use (swarm|kubernetes|all)
      --prune                  Prune services that are no longer referenced
      --resolve-image string   Query the registry to resolve image digest and supported platforms
                               ("always"|"changed"|"never") (default "always")
      --with-registry-auth     Send registry authentication details to Swarm agents

$ docker stack deploy --compose-file=docker-stack.yml voting_stack 
Creating network voting_stack_backend
Creating network voting_stack_frontend
Creating network voting_stack_default
Creating service voting_stack_result
Creating service voting_stack_worker
Creating service voting_stack_visualizer
Creating service voting_stack_redis
Creating service voting_stack_db
Creating service voting_stack_vote

$ cat docker-stack.yml
version: "3"
# create required networks and volummes. 
# services, networks, volumes, all are duplications.
networks:
  frontend:
  backend:

volumes:
  db-data:

services:
  redis:
    image: redis:alpine
    networks:
      - frontend
    deploy:
      replicas: 1
      update_config:
        parallelism: 2
        delay: 10s
      restart_policy:
        condition: on-failure
  db:
    image: postgres:9.4
    environment:
      POSTGRES_USER: "postgres"
      POSTGRES_PASSWORD: "postgres"
    volumes:
      - db-data:/var/lib/postgresql/data
    networks:
      - backend
    deploy:
      placement:
        constraints: [node.role == manager]
  vote:
    image: dockersamples/examplevotingapp_vote:before
    ports:
      - 5000:80
    networks:
      - frontend
    depends_on:
      - redis
    deploy:
      replicas: 2
      update_config:
        parallelism: 2
      restart_policy:
        condition: on-failure
  result:
    image: dockersamples/examplevotingapp_result:before
    ports:
      - 5001:80
    networks:
      - backend
    depends_on:
      - db
    deploy:
      replicas: 1
      update_config:
        parallelism: 2
        delay: 10s
      restart_policy:
        condition: on-failure

  worker:
    image: dockersamples/examplevotingapp_worker
    networks:
      - frontend
      - backend
    depends_on:
      - db
      - redis
    deploy:
      mode: replicated
      replicas: 1
      labels: [APP=VOTING]
      restart_policy:
        condition: on-failure
        delay: 10s
        max_attempts: 3
        window: 120s
      placement:
        constraints: [node.role == manager]

  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]