2026-02-12 12:17 UTC
I'm still confused on thin vs thick #jails in #FreeBSD. Even if I clone the snapshot, is it not a truly contained jail? I understand utilizing NullFS being thin. Can anyone help clarify?
Replies (1)
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@brendan@social.brendans-bits.com 2026-02-12 16:29
@drwx@mastodon.acc.sunet.se The way I think of 'thick' vs 'thin' is whether the jail has its own copy of root and how it is upgraded. A thick jail has a copy of the base system to itself. Any changes to the base system affect that jail only. You have to upgrade the base of each jail individually. A thin jail shares the base amongst multiple concurrent jails. Any changes to base affect all jails. You can upgrade the base of multiple jails simultaneously by upgrading the shared base.