Voting App

Stack file

• voting-app-stack.yml

version: "3"
services:

  redis:
    image: redis:alpine
    ports:
      - "6379"
    networks:
      - frontend
    deploy:
      replicas: 2
      update_config:
        parallelism: 2
        delay: 10s
      restart_policy:
        condition: on-failure
  db:
    image: postgres:9.4
    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
    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]

networks:
  frontend:
  backend:

volumes:
  db-data:

Output

~> docker stack deploy -c voting-app-stack.yml voteapp
Creating network voteapp_backend
Creating network voteapp_frontend
Creating network voteapp_default
Creating service voteapp_db
Creating service voteapp_vote
Creating service voteapp_result
Creating service voteapp_worker
Creating service voteapp_visualizer
Creating service voteapp_redis

~> docker stack ls
NAME                SERVICES
voteapp             6

~> docker stack ps voteapp
ID                  NAME                   IMAGE                                          NODE                DESIRED STATE       CURRENT STATE                ERROR               PORTS
b1njmmzpgcmm        voteapp_redis.1        redis:alpine                                   node1               Running             Running 7 seconds ago
x95ey2184xgp        voteapp_visualizer.1   dockersamples/visualizer:stable                node3               Running             Preparing 47 seconds ago
wgf2f30cxi1p        voteapp_worker.1       dockersamples/examplevotingapp_worker:latest   node1               Running             Running 42 seconds ago
swntnndwxd0f        voteapp_result.1       dockersamples/examplevotingapp_result:before   node2               Running             Preparing 57 seconds ago
tewhac0g3cym        voteapp_vote.1         dockersamples/examplevotingapp_vote:before     node3               Running             Running 51 seconds ago
snh51sumot29        voteapp_db.1           postgres:9.4                                   node2               Running             Running about a minute ago
uwje6shq6j12        voteapp_redis.2        redis:alpine                                   node2               Running             Preparing 4 seconds ago
wgv95v095ldz        voteapp_vote.2         dockersamples/examplevotingapp_vote:before     node1               Running             Running 51 seconds ago


~> docker stack services voteapp
ID                  NAME                 MODE                REPLICAS            IMAGE                                          PORTS
ggl399dqpbmx        voteapp_redis        replicated          2/2                 redis:alpine                                   *:30000->6379/tcp
r7cdesgag4hv        voteapp_visualizer   replicated          1/1                 dockersamples/visualizer:stable                *:8080->8080/tcp
txeqd5tns73f        voteapp_db           replicated          1/1                 postgres:9.4
ua3byn5n29ll        voteapp_vote         replicated          2/2                 dockersamples/examplevotingapp_vote:before     *:5000->80/tcp
vuv6bn3gjl12        voteapp_worker       replicated          1/1                 dockersamples/examplevotingapp_worker:latest
yvxa2jh4nunj        voteapp_result       replicated          1/1                 dockersamples/examplevotingapp_result:before   *:5001->80/tcp


~> docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
...
x80wjd8oxu44        voteapp_backend     overlay             swarm
tgh2s208273i        voteapp_default     overlay             swarm
357oak1kajm9        voteapp_frontend    overlay             swarm

• One cool feature of Stacks is that we have so called visualizer for free: