Docker Swarm setup

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5

Thanks Pawan. I’m not comfortable using nightly in production right now so we’ll stay on latest until the next version is available.

I’m reviewing the docker-compose file that is listed on the Deploy section. Here’s my version of it:

version: "3"
networks:
  dgraph:
services:
  zero:
    image: dgraph/dgraph:latest
    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:latest
    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 --memory_mb=17192 --zero=zero:5080
  server_2:
    image: dgraph/dgraph:latest
    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 --memory_mb=17192 --zero=zero:5080 -o 1
  server_3:
    image: dgraph/dgraph:latest
    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 --memory_mb=17192 --zero=zero:5080 -o 2
  ratel:
    image: dgraph/dgraph:latest
    hostname: "ratel"
    ports:
      - 8000:8000
    networks:
      - dgraph
    command: dgraph-ratel
volumes:
  data-volume:

I have an ELB setup to spread the requests around to each instance. I need to configure health checks from the balancer. I believe the health check is available at http://address:8080/health? Only AP-GRAPH-1 responds with that. Looks like the second and third servers are running from 8082 and 8083.

Am I taking the right approach here?