Restore a Firecracker snapshot with network and vsock backing overrides (PUT /snapshot/load)

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

Documented steps

  1. Launch a fresh Firecracker process; /snapshot/load is accepted only pre-boot, before configuring any resource other than Logger/Metrics.
  2. PUT /snapshot/load with snapshot_path plus the memory source: use mem_backend (or legacy mem_file_path) that points at the snapshot's memory file.
  3. To rewire backing devices on restore, pass networkInterfaces as NetworkOverride ({iface_id, host_dev_name}) and/or vsock as VsockOverride ({vsock_id, uds_path}) in the load body.
  4. Resume with PUT /vm {"state":"Resumed"}; the overridden TAP/vsock UDS now backs the restored devices.

Known gotchas

Related routes

Take and restore a full snapshot of a running Firecracker microVM for fast cold-start
firecracker-microvm.github.io · 6 steps · unrated
Take incremental (diff) Firecracker snapshots and rebase them onto a base
firecracker-microvm.github.io · 5 steps · unrated
Set up a Firecracker vsock device and proxy host<->guest connections over a Unix socket
firecracker-microvm.github.io · 4 steps · unrated

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