Docker Swarm setup

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There is no image named dgraph/dgraph:nightly. The image is dgraph/dgraph:master.

You can inspect the error message by running docker stack ps dgraph --no-trunc.

I changed nightly to master and removed the restart: on-failure line. docker swarm master node automatically handles the restart for you if a container goes down and it should not be part of the config file. The restart key is supported while using docker compose which is different from docker swarm. Here is the updated file.

version: "3"
networks:
  dgraph:
services:
  zero:
    image: dgraph/dgraph:master
    volumes:
      - data-volume:/dgraph
    ports:
      - 5080:5080
      - 6080:6080
    networks:
      - dgraph
    deploy:
      placement:
        constraints:
          - node.hostname == AP-GRAPH-1
    command: dgraph zero --my=zero:5080 --replicas 3
  server_1:
    image: dgraph/dgraph:master
    hostname: "server_1"
    volumes:
      - data-volume:/dgraph
    ports:
      - 8080:8080
      - 9080:9080
    networks:
      - dgraph
    deploy:
      placement:
        constraints:
          - node.hostname == AP-GRAPH-1
    command: dgraph server --my=server_1:7080 --lru_mb=17192 --zero=zero:5080
  server_2:
    image: dgraph/dgraph:master
    hostname: "server_2"
    volumes:
      - data-volume:/dgraph
    ports:
      - 8081:8081
      - 9081:9081
    networks:
      - dgraph
    deploy:
      placement:
        constraints:
          - node.hostname == AP-GRAPH-2
    command: dgraph server --my=server_2:7081 --lru_mb=17192 --zero=zero:5080 -o 1
  server_3:
    image: dgraph/dgraph:master
    hostname: "server_3"
    volumes:
      - data-volume:/dgraph
    ports:
      - 8082:8082
      - 9082:9082
    networks:
      - dgraph
    deploy:
      placement:
        constraints:
          - node.hostname == AP-GRAPH-3
    command: dgraph server --my=server_3:7082 --lru_mb=17192 --zero=zero:5080 -o 2
  ratel:
    image: dgraph/dgraph:master
    hostname: "ratel"
    ports:
      - 8000:8000
    networks:
      - dgraph
    command: dgraph-ratel
volumes:
  data-volume:

You can see all the running services using docker service ls and you can see logs from a service using something like docker logs -f <service_name>.