junos-exporter

This project is under development.

Overview

This is a Prometheus Exporter for Junos using PyEZ(Juniper/py-junos-eznc) Tables and Views.
PyEZ can extract information from Junos operational command output and map it to a Python data structure via yaml.
junos-exporter converts the information provided by PyEZ into the Prometheus metrics format via yaml.
So, this exporter's metrics can be flexibly configured by simply editing yaml.

Usage

usage: junos-exporter [-h] [-l LOG] [-p PORT] [-w WORKERS]

options:
  -h, --help            show this help message and exit
  -l LOG, --log LOG     logging level[default: info]
  -p PORT, --port PORT  listening port[default: 9326]
  -w WORKERS, --workers WORKERS
                        number of worker processes[default: 1]

Docker

docker run -v <config file>:/app/config.yml ghcr.io/minefuto/junos-exporter

Pip

Put the config file in "~/.junos-exporter/config.yml".

pip install junos-exporter
junos-exporter

Configuration

Please see the config.yml for configuration example.

Create Exporter Config

general:
  prefix: junos  # prefix of the metrics

Create PyEZ Operational Tables

• Parsing Structured Output
• parsing Unstructured Output
  • Using TextFSM Template

Put the yaml or textfsm file in the following directory.

• ./op/ or ~/.junos-exporter/op/ : structured & unstructured tables and views configuration file
• ./textfsm/ or ~/.junos-exporter/textfsm/ : textfsm template file

If using the following predefined operational table, you can skip this step.

• Document
  • Source Code

Create Convert Rule

optables:
  EthPortTable:  # pyez table name
    metrics:
      - name: interface_link_status  # metrics name
        value: oper  # metrics value
        type: gauge  # metrics type(gauge or count or untyped)
        help: physical interface link status(up:2, down:1)  # metrics help
        value_transform:  #(optional) if metrics value is str, can be transformed to float
          up: 2
          down: 1
          _: 0  #(optional) value_transform's fallback value(default: NaN)
      - name: interface_lastflap_seconds
        value: interface_flapped
        type: counter
        regex: (\d\d\d\d-\d\d-\d\d \d\d:\d\d:\d\d).*  #(optional) metric value can be extracted by using regexp
        to_unixtime: True  # transform to unixtime for timestamp/uptime  e.g. 2025-03-22 12:57:10, 10w3d 11:11:11
        help: physical interface link flap timestamp
    labels:
      - name: interface  # label name
        value: name  # label value
      - name: description
        value: description
        regex: (.*)  #(optional) label values can be extracted by using regexp
      - name: link_mode
        value: link_mode
      - name: mac
        value: macaddr

metrics value and label value select from fields key of PyEZ View.

EthPortView:
  groups:
    mac_stats: ethernet-mac-statistics
    flags: if-device-flags
  fields: <- !!
    oper: oper-status
    admin: admin-status
    description: description
    mtu: { mtu : int }
    link_mode: link-mode
    macaddr: current-physical-address
-snip-

PyEZ Table's key is automatically mapping to key and name.

EthPortTable:
  rpc: get-interface-information
  args:
    media: True
    interface_name: '[afgxe][et]-*'
  args_key: interface_name <- !!
  item: physical-interface
  view: EthPortView

If there are multiple keys, a number is assigned at the end such as key.0, key.1.

IsisAdjacencyTable:
  rpc: get-isis-adjacency-information
  args:
    extensive: True
  item: isis-adjacency
  key:
    - interface-name  <- key.0, name.0
    - system-name     <- key.1, name.1
  view: IsisAdjacencyView

The metrics value can be a static value.

optables:
  ArpTable:
    metrics:
      - name: arp_entry_info
        value: 1  <- !!
        type: gauge
        help: arp entry info

Create Junos Device Config

credentials:
  vjunos: # credential name
    username: admin  # junos device's username
    password: admin@123  # junos device's password

modules:
  router:  # module name
    tables:  # pyez table name(which pyez table information to retrieve in this module)
      - ArpTable
      - EthPortTable

Create Prometheus Config

scrape_configs:
  - job_name: "junos-exporter"
    static_configs:
      - targets:
          - "192.168.1.1"  # target device
          - "192.168.1.2"
        labels:
          __meta_credential: "vjunos"  # credential name
          __meta_module: "router"  # module name
      - targets:
          - "192.168.10.3"
        labels:
          __meta_credential: "vjunos"
          __meta_module: "switch"
    relabel_configs:
      - source_labels: [__meta_credential]
        target_label: __param_credential
      - source_labels: [__meta_module]
        target_label: __param_module
      - source_labels: [__address__]
        target_label: __param_target
      - source_labels: [__param_target]
        target_label: instance
      - target_label: __address__
        replacement: 127.0.0.1:9326

License

MIT