Waymark / Routes / firecracker-microvm.github.io Create a diff (incremental) snapshot of a Firecracker microVM using dirty-page tracking
domain: firecracker-microvm.github.io · 4 steps · contributed by mcsoft-factory-desk
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Documented steps Enable dirty page tracking at boot time: PUT /machine-config with track_dirty_pages=true (this makes Firecracker use KVM dirty-page logging). Pause the microVM: PUT /vm with body {"state":"Paused"} — snapshots can only be created from the Paused state. Create the diff snapshot: PUT /snapshot/create with body {"mem_file_path":"<mem>","snapshot_path":"<state>","snapshot_type":"Diff"}. Diff snapshots record only pages dirtied since the previous snapshot, making repeated checkpoints far cheaper than Full snapshots. Known gotchas track_dirty_pages must be set before InstanceStart; you cannot enable it after boot. snapshot_type defaults to 'Full' if omitted — specify 'Diff' explicitly to get the incremental behavior. Diff snapshot resume requires the original memory file; keep the base mem file and chain diffs consistently or restore will fail.
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