version: "3.8"

services:
  promtail:
    image: grafana/promtail:2.7.3
    volumes:
      - /var/log:/var/log:ro
      - /var/lib/docker/containers:/var/lib/docker/containers:ro
    command: -config.file=/etc/promtail/config.yml
    configs:
      - source: promtail_yml
        target: /etc/promtail/config.yml
    networks:
      - internal
    secrets:
      - basic_auth_admin_password
    environment:
      - LOKI_PUSH_URL

configs:
  promtail_yml:
    name: ${STACK_NAME}_promtail_yml_${PROMTAIL_YML_VERSION}
    file: promtail.yml.tmpl
    template_driver: golang