Prometheus SNMP Exporter
This is an exporter that exposes information gathered from SNMP for use by the Prometheus monitoring system.
There are two components. An exporter that does the actual scraping, and a generator (which depends on NetSNMP) that creates the configuration for use by the exporter.
Binaries can be downloaded from the Github releases page.
Visit http://localhost:9116/snmp?target=188.8.131.52 where 184.108.40.206 is the IP of the
SNMP device to get metrics from. You can also specify a
module parameter, to
choose which module to use from the config file.
The snmp exporter reads from a
snmp.yml config file by default. This file is
not intended to be written by hand, rather use the generator to
generate it for you.
snmp.yml covers a variety of common hardware for which
MIBs are available to the public, walking them using SNMP v2 GETBULK.
You'll need to use the generator in all but the simplest of setups. It is needed to customize which objects are walked, use non-public MIBs or specify authentication parameters.
The snmp exporter needs to be passed the address as a parameter, this can be done with relabelling.
scrape_configs: - job_name: 'snmp' static_configs: - targets: - 192.168.1.2 # SNMP device. metrics_path: /snmp params: module: [if_mib] relabel_configs: - source_labels: [__address__] target_label: __param_target - source_labels: [__param_target] target_label: instance - target_label: __address__ replacement: 127.0.0.1:9116 # The SNMP exporter's real hostname:port.
This setup allows Prometheus to provide scheduling and service discovery, as unlike all other exporters running an exporter on the machine from which we are getting the metrics from is not possible.
TLS and basic authentication
The SNMP Exporter supports TLS and basic authentication. This enables better control of the various HTTP endpoints.
To use TLS and/or basic authentication, you need to pass a configuration file
--web.config.file parameter. The format of the file is described
in the exporter-toolkit repository.
Note that the TLS and basic authentication settings affect all HTTP endpoints: /metrics for scraping, /snmp for scraping SNMP devices, and the web UI.
Large counter value handling
In order to provide accurate counters for large Counter64 values, the exporter will automatically wrap the value every 2^53 to avoid 64-bit float rounding.
To disable this feature, use the command line flag