Disk Performance Monitor for Kubernetes

Writes a file to disk, then reads it, on a set interval and exposes metrics on a /metrics endpoint.

Local run

Prerequisites: Ruby 3.4.7

Install dependencies: bundle install.

Start the app: bundle exec puma.

Configuration

The app is configured via ENV variables.

MEGABYTES_PER_BLOCK - How many megabytes to write per block (default: 1) BLOCKS_PER_ITERATION - How many blocks to write per iteration (default: 100) INTERVAL_IN_SECONDS - How many seconds to wait per benchmark run (default: 60)

Example metrics output

# HELP disk_read_bytes_per_second Disk read bytes per second
# TYPE disk_read_bytes_per_second gauge
disk_read_bytes_per_second %<read_bytes_per_second>
# HELP disk_write_bytes_per_second Disk write bytes per second
# TYPE disk_write_bytes_per_second gauge
disk_write_bytes_per_second %<write_bytes_per_second>

Kubernetes Deployment

Prerequisites: prometheus-operator must be present in the target cluster for the ServiceMonitor to work.

See example files under /deploy and adjust to your environment.