Daemonize a jailer-launched Firecracker microVM so it detaches from the terminal
domain: firecracker-microvm.github.io · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Add the --daemonize flag to the jailer command line, e.g. jailer --id <id> --exec-file ./firecracker --uid 1000 --gid 1000 --daemonize -- --config-file config.json
The jailer calls setsid() to start a new session and detach from the controlling terminal.
stdin, stdout and stderr are redirected to /dev/null via dup2(), so capture logs by configuring Firecracker's Logger/metrics to a file inside the chroot instead.
Combine with --new-pid-ns if you also want the VM in its own PID namespace.
Check the process survived: ps or look for the firecracker process running as the jailed uid; then talk to it over its unix socket.
Known gotchas
Because stdio goes to /dev/null, print-based debugging inside the VM is invisible — configure Firecracker Logger to a file path relative to the chroot.
--daemonize works independently of --new-pid-ns; remember to pass parent-cgroup/id if you need to find the cgroup of the daemonized process.
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