Example Docker Stack Deploy with Node/Service/Task values

docker-compose.yml

version: "3.1"
networks:
  public:

  example_net:
    internal: true
    driver_opts:
      encrypted: ""
    ipam:
      config:
        - subnet: 172.16.4.0/24

services:
  playground:
    image: node
    hostname: "{{.Service.Name}}-{{.Task.Slot}}-{{.Node.ID}}"
    environment:
      SWARM_PEERS: "tasks.{{.Service.Name}}"
      SWARM_TASK_SLOT: "{{.Task.Slot}}"
      SWARM_SERVICE_TASK: |
        { "node": "{{.Node.ID}}"
        , "service": { "id":"{{.Service.ID}}", "name": "{{.Service.Name}}", "dns_peers": "tasks.{{.Service.Name}}", "labels": "{{js .Service.Labels}}" }
        , "task": { "id": "{{.Task.ID}}", "name": "{{.Task.Name}}", "slot": {{.Task.Slot}} } }

    command: ['node', '-e', 'require("http").createServer((req,res) => {res.end([[req.method, req.httpVersion, req.url], ["On host:", require("os").hostname()], ["SWARM_SERVICE_TASK:", process.env.SWARM_SERVICE_TASK], []].map(l=>l.join(" ")).join("\n"))}).listen(3001, "0.0.0.0", ()=> {})']

    networks:
      - example_net
      - public
    ports: ["3001:3001"]

    deploy:
      replicas: 3