Daemonize a Firecracker microVM in the background with the jailer (setsid, stdio detached)
domain: firecracker-microvm.github.io · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Use a statically linked (default musl) Firecracker and a jailer of the same version; run as root (needs capability to chroot/cgroup).
Invoke the jailer with --daemonize plus identity and privilege-dropping flags, e.g.: jailer --id <vm-id> --exec-file /usr/bin/firecracker --uid 123 --gid 100 --daemonize
Add cgroup/netns/resource-limit flags as needed before --daemonize.
--daemonize makes the jailer call setsid() and redirect STDIN, STDOUT, STDERR all to /dev/null, so the jailed Firecracker runs detached from your terminal.
Recover control through the Firecracker API socket (--api-sock forwarded after '--'), not the terminal: curl --unix-socket /path/firecracker.sock http://localhost/version
Known gotchas
--daemonize only detaches stdio via setsid(); it does NOT create a PID namespace on its own — combine with --new-pid-ns if you also need PID isolation.
Because stdio goes to /dev/null, configure --logger and --metrics (via API) to a named pipe or file before relying on any output.
Must run as root; the jailer drops to --uid/--gid only after building the chroot and cgroups.
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