io-exporter

Report if a given filesystem is operating properly

Description

This little exporter checks if a filesystem is working properly by writing and reading to a specified file using direct/io. It reports the results via HTTP as prometheus metrics. Additional labels can be specified via commandline.

Usage

io-exporter [options] <file>
Options:
-t --timeout <int>          When should the operation timeout in seconds
-l --label   <label=value>  Add label to exported metric
-h --help                   Show help
-v --version                Show program version

Output

Given this command:

io-exporter -l foo=bar -l blah=blubb t/blah

You'll get such metrics:

# HELP io_exporter_io_latency how long does the operation take in seconds
# TYPE io_exporter_io_latency gauge
io_exporter_io_latency{file="/tmp/blah",maxwait="1",namespace="debug",pod="foo1"} 0.0001142815
# HELP io_exporter_io_operation whether io is working on the pvc, 1=ok, 0=fail
# TYPE io_exporter_io_operation gauge
io_exporter_io_operation{file="/tmp/blah",maxwait="1",namespace="debug",pod="foo1"} 1

Installation

There are no released binaries yet.

Installation from source

Check out the repository and execute go build, then copy the compiled binary to your $PATH.

Or, if you have GNU Make installed, just execute:

go build

Docker

To build:

docker compose build

To run locally:

mkdir t
chmod 1777 t
docker compose run -v ./t:/pvc ioexporter /pvc/blah

Report bugs

Please open an issue. Thanks!

License

This work is licensed under the terms of the General Public Licens version 3.

Author

Copyleft (c) 2025 Thomas von Dein