Portainer + Caddy = <3

portainer-agent-caddy.yml

version: '3.3'

services:
  agent:
    image: portainer/agent:latest
    environment:
      AGENT_CLUSTER_ADDR: tasks.agent
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - /var/lib/docker/volumes:/var/lib/docker/volumes
    networks:
      - agent-network
    deploy:
      mode: global
      placement:
        constraints:
          - node.platform.os == linux

  portainer:
    image: portainer/portainer-ce:latest
    command: -H tcp://tasks.agent:9001 --tlsskipverify
    volumes:
      - portainer-data:/data
    networks:
      - agent-network
      - caddy-public
    deploy:
      mode: global
      placement:
        constraints:
          - node.role == manager
          - node.labels.portainer.portainer-data == true
      labels:
        - caddy=${DOMAIN?Variable not set}
        - caddy.reverse_proxy={{upstreams 9000}}


  caddy:
    image: lucaslorentz/caddy-docker-proxy:ci-alpine
    ports:
      # Listen on port 80, default for HTTP, necessary to redirect to HTTPS
      - target: 80
        published: 80
        mode: host
      # Listen on port 443, default for HTTPS
      - target: 443
        published: 443
        mode: host
    deploy:
      mode: global
      placement:
        constraints:
          - node.role == manager
    networks:
      - caddy-public
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - caddy_data:/data

networks:
  # added with: docker network create --driver=overlay --attachable agent-network
  agent-network:
    external: true
  # added with: docker network create --driver=overlay --attachable caddy-public
  caddy-public:
    external: true

volumes:
  portainer-data:
  caddy_data: