version: '3.2'

services:
  telegraf:
    image: telegraf:1.36
    restart: unless-stopped
    network_mode: host
    pid: host
    entrypoint: ["/scripts/telegraf-entrypoint.sh"]
    environment:
      INFLUXDB_URL: ${INFLUXDB_URL}
      INFLUXDB_DB: ${INFLUXDB_DB:-host_metrics}
      INFLUXDB_USER: ${INFLUXDB_WRITE_USER}
      INFLUXDB_PASSWORD: ${INFLUXDB_WRITE_PASSWORD}
      COLLECT_INTERVAL: ${COLLECT_INTERVAL:-10s}
      HOST_TAG: ${HOST_TAG:-}
      COLLECT_ZFS: ${COLLECT_ZFS:-false}
    volumes:
      - ../config/host-metrics/telegraf.conf.tpl:/etc/telegraf/telegraf.conf.tpl:ro
      - ../config/host-metrics/scripts/telegraf-entrypoint.sh:/scripts/telegraf-entrypoint.sh:ro
      - /proc:/hostfs/proc:ro
      - /sys:/hostfs/sys:ro
      - /:/hostfs:ro
      # /dev is needed by inputs.diskio: it enumerates devices from
      # /proc/diskstats and then opens /dev/<name> for udev/uevent lookups.
      # Without this mount telegraf logs an "error reading /dev/<name>" warning
      # per device per collection cycle.
      - /dev:/dev:ro
      # /run/udev is where modern systemd stores the udev database that
      # gopsutil consults for per-device tags. Without it telegraf falls
      # back to the legacy /dev/.udev/db/... path which doesn't exist on
      # systemd hosts, producing "stat /dev/.udev/db/block:..." warnings.
      - /run/udev:/run/udev:ro