version: '3.8'

services:
  promtail:
    image: grafana/promtail:latest
    container_name: ${CONTAINER_NAME}
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - /var/log:/var/log:ro
      - /var/lib/docker/containers:/var/lib/docker/containers:ro
      - ${CONFIG_PATH}/promtail.yaml:/etc/promtail/config.yml:ro
      - promtail_positions:/tmp/positions
    command: -config.file=/etc/promtail/config.yml
    environment:
      - HOSTNAME=${HOSTNAME_LABEL:-$(hostname)}
    restart: unless-stopped

volumes:
  promtail_positions: