Start Firecracker from a config file through the jailer (forward arguments after '--')
domain: firecracker-microvm.github.io · 4 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Write a Firecracker JSON config file BEFORE jailing, then pass it after '--': jailer --id <vm-id> --exec-file /usr/bin/firecracker --uid 123 --gid 100 -- --config-file <path>
The jailer forwards every parameter after '--' directly to Firecracker; it already passes --id itself, so omit it from config.
The config-file path and every resource it references (kernel, rootfs, vsock uds, api sock) must be valid RELATIVE to the jailed Firecracker's chroot root.
Place the referenced files inside the jail root (/srv/jailer/firecracker/<vm-id>/root/...) so Firecracker can open them post-chroot.
Known gotchas
After '--' you are talking to Firecracker, not the jailer — the file path must resolve inside the chroot, not on the host filesystem.
Because stdio is often detached/daemonized, keep configured absolute paths inside the jail consistent or the VM fails to find its kernel/rootfs.
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