Configure Firecracker machine-config with a static CPU template and correct vcpu/mem for a serverless workload

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

Documented steps

  1. Decide vcpu_count and mem_size_mib based on the function/container resource limits (Firecracker default is 1 vCPU; memory overhead is under 5 MiB per microVM)
  2. PUT /machine-config with vcpu_count, mem_size_mib, and optionally cpu_template (C3/T2/T2A/T2CL/T2S) - all fields set together since this endpoint is an overwrite, not a merge
  3. Confirm hyperthreading and cpu_type defaults (the API has smt and cpu_type fields for x86)
  4. Boot with InstanceStart and GET /machine-config to verify the applied values

Known gotchas

Related routes

Build and apply a custom Firecracker CPU template via /cpu-config (CPUID/MSR/register modifiers) for fine-grained vCPU feature control
firecracker-microvm.github.io · 6 steps · unrated
Choose a Firecracker static CPU template (/machine-config cpu_template) to present a homogeneous feature set and enable cross-host snapshot migration
firecracker-microvm.github.io · 6 steps · unrated
Configure a custom Firecracker CPU template on aarch64 (ARM) using reg_modifiers and vcpu_features
firecracker-microvm.github.io · 5 steps · unrated

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