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README.md

SNMP Exporter Config Generator

This config generator uses NetSNMP to parse MIBs, and generates configs for the snmp_exporter using them.

Building

Due to the dynamic dependency on NetSNMP, you must build the generator yourself.

sudo apt-get install build-essential libsnmp-dev snmp-mibs-downloader  # Debian-based distros
go get github.com/prometheus/snmp_exporter/generator
cd ${GOPATH-$HOME/go}/src/github.com/prometheus/snmp_exporter/generator
go build

Running

./generator generate

The generator reads in from generator.yml and writes to snmp.yml.

Additional command are available for debugging, use the help command to see them.

Docker Users

If you would like to run the generator in docker to generate your snmp.yml config run the following commands.

docker build -t snmp-generator .
docker run -ti \
  -v $HOME/.snmp/mibs:/root/.snmp/mibs \
  -v $PWD/generator.yml:/opt/generator.yml:ro \
  -v $PWD/out/:/opt/ \
  snmp-generator generate

File Format

generator.yml provides a list of modules. The simplest module is just a name and a set of OIDs to walk.

modules:
  module_name:  # The module name. You can have as many modules as you want.
    walk:       # List of OIDs to walk. Can also be SNMP object names.
      - 1.3.6.1.2.1.2  # Same as "interfaces"

    version: 2  # SNMP version to use. Defaults to 2.
                # 1 will use GETNEXT, 2 and 3 use GETBULK.
    max_repetitions: 25  # How many objects to request with GETBULK, defaults to 25.
                         # May need to be reduced for buggy devices.
    retries: 3   # How many times to retry a failed request, defaults to 3.
    timeout: 10s # Timeout for each walk, defaults to 10s.

    auth:
      # Community string is used with SNMP v1 and v2. Defaults to "public".
      community: public

      # v3 has different and more complex settings.
      # Which are required depends on the security_level.
      # The equivalent options on NetSNMP commands like snmpbulkwalk
      # and snmpget are also listed. See snmpcmd(1).
      username: user  # Required, no default. -u option to NetSNMP.
      security_level: noAuthNoPriv  # Defaults to noAuthNoPriv. -l option to NetSNMP.
                                    # Can be noAuthNoPriv, authNoPriv or authPriv.
      password: pass  # Has no default. Also known as authKey, -A option to NetSNMP.
                      # Required if security_level is authNoPriv or authPriv.
      auth_protocol: SHA  # MD5 or SHA, defaults to SHA. -a option to NetSNMP.
                          # Used if security_level is authNoPriv or authPriv.
      priv_protocol: DES  # DES or AES, defaults to DES. -x option to NetSNMP.
                          # Used if security_level is authPriv.
      priv_password: otherPass # Has no default. Also known as privKey, -X option to NetSNMP.
                               # Required if security_level is authPriv.
      context_name: context # Has no default. -n option to NetSNMP.
                            # Required if context is configured on the device.

    lookups:  # Optional list of lookups to perform.
              # This must only be used when the new index is unique.

      # If the index of a table is bsnDot11EssIndex, usually that'd be the label
      # on the resulting metrics from that table. Instead, use the index to
      # lookup the bsnDot11EssSsid table entry and create a bsnDot11EssSsid label
      # with that value.
      - old_index: bsnDot11EssIndex
        new_index: bsnDot11EssSsid

     overrides: # Allows for per-module overrides of bits of MIBs
       metricName:
         regex_extracts:
           Temp: # A new metric will be created appending this to the metricName to become metricNameTemp.
             - regex: '(.*)' # Regex to extract a value from the returned SNMP walks's value.
               value: '$1' # The result will be parsed as a float64, defaults to $1.
           Status:
             - regex: '.*Example'
               value: '1'
             - regex: '.*'
               value: '0'

Where to get MIBs

Some of these are quite sluggish, so use wget to download.

Put the extracted mibs in a location NetSNMP can read them from. $HOME/.snmp/mibs is one option.

https://github.com/librenms/librenms/tree/master/mibs can also be a good source of MIBs.

http://oidref.com is recommended for browsing MIBs.