configuration.md

Configuration

Simply scraping the standard /metrics endpoint will make the exporter emit local IPMI metrics. If the exporter is running with sufficient privileges, no special configuration is required. See the privileges document for more details.

For remote metrics, the general configuration pattern is that of a multi-target exporter. Please read that guide to get the general idea about this approach.

We offer this approach as IPMI devices often provide useful information even while the supervised host is turned off. Also, you can have a single exporter instance probing many (possibly thousands of) IPMI devices, rather than one exporter per IPMI device.

NOTE: If you are using remote metrics, but still want to get the local process metrics from the instance, you must use a default module with an empty collectors list and use other modules for the remote hosts.

IPMI exporter

The exporter can read a configuration file by setting config.file (see above). To collect local metrics, you might not even need one. For remote metrics, it must contain at least user names and passwords for IPMI access to all targets to be scraped. You can additionally specify the IPMI driver type and privilege level to use (see man 5 freeipmi.conf for more details and possible values).

The config file supports the notion of "modules", so that different configurations can be re-used for groups of targets. See the section below on how to set the module parameter in Prometheus. The special module "default" is used in case the scrape does not request a specific module.

The configuration file also supports a blacklist of sensors, useful in case of OEM-specific sensors that FreeIPMI cannot deal with properly or otherwise misbehaving sensors. This applies to both local and remote metrics.

There are two commented example configuration files, see ipmi_local.yml for scraping local host metrics and ipmi_remote.yml for scraping remote IPMI interfaces.

Prometheus

Local metrics

Collecting local IPMI metrics is fairly straightforward. Simply configure your server to scrape the default metrics endpoint on the hosts running the exporter.

- job_name: ipmi
  scrape_interval: 1m
  scrape_timeout: 30s
  metrics_path: /metrics
  scheme: http
  static_configs:
  - targets:
    - 10.1.2.23:9290
    - 10.1.2.24:9290
    - 10.1.2.25:9290

Remote metrics

To add your IPMI targets to Prometheus, you can use any of the supported service discovery mechanism of your choice. The following example uses the file-based SD and should be easy to adjust to other scenarios.

Create a YAML file that contains a list of targets, e.g.:

---
- targets:
  - 10.1.2.23
  - 10.1.2.24
  - 10.1.2.25
  - 10.1.2.26
  - 10.1.2.27
  - 10.1.2.28
  - 10.1.2.29
  - 10.1.2.30
  labels:
    job: ipmi_exporter

This file needs to be stored on the Prometheus server host. Assuming that this file is called /srv/ipmi_exporter/targets.yml, and the IPMI exporter is running on a host that has the DNS name ipmi-exporter.internal.example.com, add the following to your Prometheus config:

- job_name: ipmi
  params:
    module: ['default']
  scrape_interval: 1m
  scrape_timeout: 30s
  metrics_path: /ipmi
  scheme: http
  file_sd_configs:
  - files:
    - /srv/ipmi_exporter/targets.yml
    refresh_interval: 5m
  relabel_configs:
  - source_labels: [__address__]
    separator: ;
    regex: (.*)
    target_label: __param_target
    replacement: ${1}
    action: replace
  - source_labels: [__param_target]
    separator: ;
    regex: (.*)
    target_label: instance
    replacement: ${1}
    action: replace
  - separator: ;
    regex: .*
    target_label: __address__
    replacement: ipmi-exporter.internal.example.com:9290
    action: replace

This assumes that all hosts use the default module. If you are using modules in the config file, like in the provided ipmi_remote.yml example config, you will need to specify on job for each module, using the respective group of targets.

In a more extreme case, for example if you are using different passwords on every host, a good approach is to generate an exporter config file that uses the target name as module names, which would allow you to have single job that uses label replace to set the module. Leave out the params in the job definition and instead add a relabel rule like this one:

  - source_labels: [__address__]
    separator: ;
    regex: (.*)
    target_label: __param_module
    replacement: ${1}
    action: replace

For more information, e.g. how to use mechanisms other than a file to discover the list of hosts to scrape, please refer to the Prometheus documentation.