homelab/server/config/monitoring

Monitoring Specification

Monitors are split into three types: Host, Application, and IoT All monitors use a Prometheus exporter.

Hosts

Name	IP (if static)	OS	Exporter
Router	192.168.1.1	Linux 4.14)	node_exporter
Server	192.168.1.23	Linux 5.10)	node_exporter
Seedbox	192.168.1.21	Linux 5.10)	node_exporter
NAS	192.168.1.10	FreeBSD 12.2)	???
PiHole	192.168.1.22	Linux 5.10)	node_exporter

Applications

Name	Address(es)	Exporter
Minecraft	e6.jafner.net, vanilla.jafner.net	mc-monitor
GitLab	gitlab.jafner.net	GitLab Integrated Exporter
Traefik	traefik.jafner.net	Prometheus - Traefik.io
Deluge	jafner.seedbox:52000, jafner.seedbox:52100, jafner.seedbox:52200	deluge_exporter
Plex	plex.jafner.net	Tautulli and tautulli-exporter, or plex_exporter
PeerTube	peertube.jafner.net	Add a Prometheus Exporter - GitHub Issue
WordPress	nvgm.jafner.net	wordpress-exporter
SabNZBD	sabnzbd.jafner.net	sabnzbd_exporter
Uptime Kuma	uptime.jafner.tools	Prometheus Integration - Uptime Kuma Wiki
PiHole	jafner.pi1	pihole-exporter
ZFS	nas.jafner.net	zfs_exporter

IoT

Name	Hostname	Assigned IP	Note
tasmota-1	tasmota-F6441E-1054	192.168.1.50
tasmota-2	tasmota-F6D7D3-6099	192.168.1.51
tasmota-3	tasmota-F6F062-4194	192.168.1.52

Adding Loki and Promtail

Followed this guide from Techno Tim. Non-tracked changes include:

1. docker plugin install grafana/loki-docker-driver:latest --alias loki --grant-all-permissions to install the Loki docker plugin.

Instrumenting: Daemon-Level Logging

Edit /etc/docker/daemon.json to add the following block:

{
    "log-driver": "loki",
    "log-opts": {
        "loki-url": "http://localhost:3100/loki/api/v1/push",
        "loki-batch-size": "400",
        "loki-retries": "1",
        "loki-timeout": "2s"
    }
}

NOTE: All logging will fail if the Loki container is inaccessible. This may cause the Docker daemon to lock up. These parameters are applied when a container is created, so all containers must be destroyed to resolve the issue. NOTE: The batch size here is in lines for all docker logs.

Instrumenting: Per-Container Logging

Add the following logging parameter to each main-service container within a stack.

services:
  <some-service>:
    logging:
      driver: loki
      options:
        loki-url: http://localhost:3100/loki/api/v1/push
        loki-batch-size: "50"
        loki-retries: "1"
        loki-timeout: "2s"
        keep-file: "true"

NOTE: The batch size here is in lines for only the selected container.

See loki log-opts for list of available configuration options for loki logging driver. See docker-compose logging for Docker-compose logging reference.

Instrumenting: Default Docker Logging

Per: Docker docs

The default logging driver is json-file.

The configuration options for the json-file logging driver are here.

Docker-compose adds a few labels to containers it starts. This feature is not comprehensively documented, but here: Compose Specification. And we can see what labels are added by default by simply looking at a deployed application (wg-easy):

Label Key	Value
com.docker.compose.config-hash	f75588baa1056ddc618b1741805d2600b4380e13c5114106de6c8322f79dfd3f
com.docker.compose.container-number	1
com.docker.compose.oneoff	False
com.docker.compose.project	wireguard
com.docker.compose.project.config_files	docker-compose.yml
com.docker.compose.project.working_dir	/home/joey/homelab/server/config/wireguard
com.docker.compose.service	wg-easy
com.docker.compose.version	1.29.2

These are labels on the container, which are distinct from tags in the actual json log payload. Log tags are documented here.