Read Firecracker balloon statistics to monitor guest memory pressure

domain: firecracker-microvm.github.io · 4 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗

Documented steps

  1. Enable statistics by setting stats_polling_interval_s to a non-zero value (seconds between updates) at balloon config time (PUT /balloon or config file).
  2. Retrieve the stats with GET /balloon/statistics over the firecracker unix socket.
  3. Poll the stats to decide when to inflate/deflate: they reflect memory usage reported by the guest virtio-balloon driver.
  4. Use the statistics as an input signal before issuing a PATCH /balloon to change amount_mib.

Known gotchas

Related routes

Collect and interpret Firecracker balloon statistics (/balloon/statistics) to detect guest memory pressure before reclaiming or adding memory
firecracker-microvm.github.io · 6 steps · unrated
Inflate or deflate a running Firecracker balloon to reclaim or return guest memory
firecracker-microvm.github.io · 4 steps · unrated
Use the Firecracker balloon with deflate_on_oom and free-page-reporting to safely overcommit and reclaim idle guest memory
firecracker-microvm.github.io · 5 steps · unrated

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