Oct 18, 2026, 8:16 AMYou can run a jail with a single binary, but I tend to ignore ‘jails vs containers’ posts because the whole comparison is a category error.
Containers are a distribution and orchestration model that depend on:
- A snapshotting or overlay filesystem.
- A networking model with local routing and firewalling.
- An isolation mechanism.
On FreeBSD, these are typically provided by ZFS for the first, a mixture of things for the second, and jails for the third. The third could also be provided by bhyve.
Jails are a good implementation of the isolation mechanism that containers require. ZFS is a good implementation of the snapshotting filesystem that the container layers model requires. Yet no one writes ‘ZFS vs containers’ comparisons.
