Morgan - Jail w/differnet version of FreeBSD

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Hi Guys!

While upgrading to 12.0 recently, a question came to mind. Part of the upgrade process calls for reinstalling all packages under the new version, which makes sense to me.

I've also heard that jails can be used to run earlier versions of FreeBSD and their associated packages. That sounds neat!

But how can both of these be true at the same time? Jails share a kernel with the host. If a package from a previous version of FreeBSD must be upgraded to run properly, how can the same package be expected to run without issue in a jail?

Keep up the good work,
Morgan
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