XRootD Exporter

This repository contains code for a prometheus exporter that exports metrics of XRootD dataservers and redirectors. It uses XRootD's mpxstats tool, which can optionally be enabled on servers/redirectors to send statistics to listeners via UDP. The exporter transforms mpxstats metrics into prometheus metrics, making those available for monitoring via prometheus. A optional file containing descriptions for metrics is provided seperatly.

Dependencies

• Python 3.X
• prometheus_client python package

Usage

The process can be started by

python3 /path/to/xrootd_exporter.py

Alternatively, a systemd unitfile is provided.

XRootD

Modify your xrootd configuration and point it to the host::port running the exporter

xrd.report 127.0.0.1:10024 every 10 -all

Configuration

On startup, xrootd_exporter.py looks for 4 optional environmental variables:

1. MPX_PORT defines the UDP listening port of the exporter's mpxstats process, the default is 10024
2. MPX_PATH defines the path to the mpxstats binary
3. EXPORTER_PORT defines the TCP listening port of the exporter's prometheus web server, the default is 9090
4. EXPORTER_DESCRIPTION_FILE defines the path to file containing metric descriptions

When using the systemd unitfile you can easily modify the service by adding

Environment=MPX_PATH=/usr/local/bin/mpxstats

Vagrant setup

A Vagrant/Ansible setup consisting of 2 data servers and grafana/prometheus instance is available here.

Limitations

Right now these limitations exist on the exporter:

1. The exporter can only show field descriptions for the first oss.path and cmsd.node
2. The exporter will hang until mpxstats has received information at least once

License

LGPL3 as described in the License File

Project status

As for the current scope this exporter is considered completed. It implements all summary statistics available via mpxstats. Even though, a much more advanced exporter based on the detailed monitoring data format might prove useful in the future.

Contribution

Feel free to suggest features and report bugs via issues