Tune Firecracker microVM machine configuration: vCPU count, memory, SMT, and dirty-page tracking

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

Documented steps

  1. Configure the machine before boot: curl --unix-socket /tmp/firecracker.socket -X PUT http://localhost/machine-config -d '{"vcpu_count":2,"mem_size_mib":1024,"smt":false,"track_dirty_pages":true}'
  2. Set track_dirty_pages=true ahead of any future diff snapshots so Firecracker uses KVM dirty-page logging instead of mincore(2)
  3. Read the current config with GET /machine-config
  4. Ensure machine-config, boot-source, drives, and network are all set BEFORE InstanceStart

Known gotchas

Related routes

Tune Firecracker machine configuration: vCPU count, memory size, SMT, dirty-page tracking, and huge pages
github.com/firecracker-microvm/firecracker · 8 steps · unrated
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firecracker-microvm.github.io · 4 steps · unrated
Build and apply a custom Firecracker CPU template via /cpu-config (CPUID/MSR/register modifiers) for fine-grained vCPU feature control
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