Autoregister your swarm nodes in Portainer

deploy.sh

# Create the password needed to login to portainer and reuse it for the portainer endpoints.
export VOLUME_DRIVER=local
export PORTAINER_PASS=mySuperSECRETPass

export PORTAINER_ENC_PASS=$(docker run --rm httpd:2.4-alpine htpasswd -nbB admin ${PORTAINER_PASS} | cut -d ":" -f 2)
echo $PORTAINER_PASS | docker secret create portainer_password.v1 --label portainer -

# Deploy the stack!
docker stack deploy --compose-file docker-compose.yml portainer

# In just a few seconds you should have your portainer service with all the cluster nodes auto-registered!

docker-compose.yml

version: "3.3"

networks:
  portainer:

volumes:
  portainer:
    driver: ${VOLUME_DRIVER}

services:
  portainer:
    image: portainer/portainer
    networks:
      - portainer
    ports:
      - "9000:9000"
    volumes:
      - portainer:/data
      - /var/run/docker.sock:/var/run/docker.sock
    command: [
        "--admin-password", "${PORTAINER_ENC_PASS}"
    ]
    deploy:
      mode: replicated
      replicas: 1
      resources:
        limits:
          cpus: '0.20'
          memory: 30M
        reservations:
          cpus: '0.10'
          memory: 25M

  portainer-endpoint:
    image: softonic/portainer-endpoint
    networks:
      - portainer
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - /etc/hostname:/etc/host_hostname
    environment:
      HOST_HOSTNAME: "/etc/host_hostname"
      PORTAINER_ADDR: "portainer:9000"
      PORTAINER_USER: "admin"
      PORTAINER_PASS: "--DOCKER-SECRET:portainer_password--"
    secrets:
      - source: "portainer_password.v1"
        target: "portainer_password"
        uid: "33"
        gid: "33"
        mode: 0400
    deploy:
      mode: global
      resources:
        limits:
          cpus: '0.10'
          memory: 20M
        reservations:
          cpus: '0.05'
          memory: 10M

secrets:
  portainer_password.v1:
    external: true