Don't be a fool (like I was) when it comes to #jails on #FreeBSD. I ignored them despite using FreeBSD for decades, because I had no problem that could not be solved w/o them and thought "why learn yet another technology I barely need".

But it's not only about solving problems. It gives you a super lightweight and fast tool to test things (and trashing 🗑️ them with zfs destroy) without cluttering your configs or interfering with production services.

E.g. I hesitated to run a webserver for publishing content because I didn't want a publicly accessible Apache on my mail relays, nor on my Nextcloud instance at home.

With jails, the MX is left unmodified. If I feel like it I could move it to a different system just using tar or cpio or zfs send.

All I needed to accomplish that was a few shell scripts to initially generate a jail template and, of course, the invaluable book "FreeBSD Mastery: Jails" of @mwlMichael W Lucas .

What motivated me to get started? All the
speakers at #EuroBSDCon showing what incredible things they do with Jails. Especially >>IMUNES: A Network Emulation and Simulation Tool Built on FreeBSD<<.

If you want to watch the IMUNES talk you can find the link on my jailed webserver 😉 here https://pub.v32bis.cc/eurobsdcon.html