Jails are just the runtime mechanism, equivalent to cgroups/namespaces/etc in Linux. What Docker provides is the tooling for repeatable container setups, so you

Jails are just the runtime mechanism, equivalent to cgroups/namespaces/etc in Linux. What Docker provides is the tooling for repeatable container setups, so you can have a single configuration file that you can deploy locally for testing and then on the server. What would you use for doing the same with jails?