docker-compose.yml

version: '2'

services:
  drone-server:
    image: drone/drone:0.8

    ports:
      - 8001:8000
      - 9000
    volumes:
      - /var/lib/drone:/var/lib/drone/
    restart: always 
    environment:
      - DRONE_OPEN=${DRONE_OPEN}
      - DRONE_HOST=${DRONE_HOST}
      - DRONE_GITHUB=${DRONE_GITHUB}
      - DRONE_GITHUB_CLIENT=${DRONE_GITHUB_CLIENT}
      - DRONE_GITHUB_SECRET=${DRONE_GITHUB_SECRET}
      - DRONE_SECRET=${DRONE_SECRET}
      - DRONE_ADMIN=${DRONE_ADMIN}
  drone-agent:
    image: drone/agent:0.8

    command: agent
    restart: always
    depends_on:
      - drone-server
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock   
    environment:
      - DRONE_SERVER=${DRONE_SERVER}
      - DRONE_SECRET=${DRONE_SECRET}

drone.service

[Unit]
Description=Drone server
After=docker.service nginx.service
[Service]
EnvironmentFile=/etc/drone/.env
Restart=always
ExecStart=/usr/local/bin/docker-compose -f /etc/drone/docker-compose.yml up
ExecStop=/usr/local/bin/docker-compose -f /etc/drone/docker-compose.yml stop
[Install]
WantedBy=multi-user.target