96 lines
4.3 KiB
Markdown
96 lines
4.3 KiB
Markdown
# Prometheus
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[Prometheus](https://prometheus.io/) is a metrics collection and alerting monitoring solution.
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## Configuration
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To enable this service, add the following configuration to your `vars.yml` file and re-run the [installation](../installing.md) process:
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```yaml
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########################################################################
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# #
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# prometheus #
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# #
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########################################################################
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prometheus_enabled: true
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########################################################################
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# #
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# /prometheus #
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# #
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########################################################################
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```
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By default, Prometheus is configured to scrape (collect metrics from) its own process. If you wish to disable this behavior, use `prometheus_self_process_scraper_enabled: false`.
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To make Prometheus useful, you'll need to make it scrape one or more hosts by adjusting the configuration.
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### Integrating with Prometheus Node Exporter
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If you've installed [Prometheus Node Exporter](prometheus-node-exporter.md) on the same host, you can make Prometheus scrape its metrics with the following **additional configuration**:
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```yaml
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prometheus_self_node_scraper_enabled: true
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prometheus_self_node_scraper_static_configs_target: "{{ prometheus_node_exporter_identifier }}:9100"
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# node-exporter runs in another container network, so we need to connect to it.
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prometheus_container_additional_networks:
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- "{{ prometheus_node_exporter_container_network }}"
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```
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To scrape a **remote** Prometheus Node Exporter instance, do not use `prometheus_self_node_scraper_*`, but rather follow the [Scraping any other exporter service](#scraping-any-other-exporter-service) guide below.
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### Scraping any other exporter service
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To inject your own scrape configuration, use the `prometheus_config_scrape_configs_additional` variable that's part of the [ansible-role-prometheus](https://github.com/mother-of-all-self-hosting/ansible-role-prometheus) Ansible role.
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Example **additional** configuration:
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```yaml
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prometheus_config_scrape_configs_additional:
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- job_name: some_job
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metrics_path: /metrics
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scrape_interval: 120s
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scrape_timeout: 120s
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static_configs:
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- targets:
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- some-host:8080
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- job_name: another_job
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metrics_path: /metrics
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scrape_interval: 120s
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scrape_timeout: 120s
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static_configs:
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- targets:
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- another-host:8080
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```
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If you're scraping others services running in containers over the container network, make sure the Prometheus container is connected to their own network by adjusting `prometheus_container_additional_networks` as demonstrated above for [Integrating with Prometheus Node Exporter](#integrating-with-prometheus-node-exporter).
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### Exposing the web interface
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By setting a hostname you will expose prometheus on this domain.
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Usually you should also set up basic_auth in this case, otherwise everyone will be able to access your metrics
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```yaml
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prometheus_hostname: prometheus.example.com
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# Uncommenting the following lines allows you to configure basic auth
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# prometheus_container_labels_metrics_middleware_basic_auth_enabled: true
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# Use `htpasswd -nb USERNAME PASSSWORD` to generate the users below.
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# prometheus_container_labels_metrics_middleware_basic_auth_users: ''
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```
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## Recommended other services
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- [Grafana](grafana.md) - a web-based tool for visualizing your Prometheus metrics (time-series)
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- [Grafana Loki](grafana-loki.md) - a log aggregation system that helps collect, store, and analyze logs in a scalable and efficient manner (like Prometheus, but for logs)
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- [prometheus-blackbox-exporter](prometheus-blackbox-exporter.md) - Blackbox probing of HTTP/HTTPS/DNS/TCP/ICMP and gRPC endpoints
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- [prometheus-node-exporter](prometheus-node-exporter.md) - an exporter for machine metrics
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- [prometheus-postgres-exporter](prometheus-postgres-exporter.md) - an exporter for monitoring a [Postgres](postgres.md) database server
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- [Healthchecks](healthchecks.md) - a simple and Effective Cron Job Monitoring solution
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