Date: Fri, 24 Sep 2010 18:03:06 +0200 From: Torbjorn Granlund <tg@gmplib.org> To: freebsd-questions@freebsd.org Subject: Mount order for ZFS, jails, and nullfs Message-ID: <867hibxh6t.fsf@shell.gmplib.org>
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In jails, I'd like a local ZFS /, a read-only nullfs-mounted /usr, and a local /usr/local. (I'd also have read-only nullfs-mounted /bin, /lib, /libexec, but let's forget about that for now.) This way, I can upgrade the master /usr once, in one place, and have all jails inherit it. And my dear jail inmates can install anything in /usr/local (such as their favourite packages/ports). I.e., things should look like this: /myjail/ zfs /myjail/usr nullfs ro /myjail/usr/local zfs There is no problem to make this happen by issuing a handful of commands manually after boot, but I cannot seem to get it to work automatically, with existing boot mechanism. The problem is that the mount of /usr will be attempted before ZFS has mounted /myjail, the jail's root. ZFS maintains its own mount table. It is possible to disable the automated mounting in ZFS by specifying the pseudo mountpoint "legacy", and then--according to the FreeBSD manual--mount it with mount(8). Unfortunately, FreeBSD's mount seems unable to perform mounts of ZFS volumes. How can I achieve the result I want after a reboot? (The reply "use ezjail!" is not the right one. :-) It does not do what I want to do. I dislike its symlink forest, and that it creates just one ZFS filesystem for the entire jail.) --=20 Torbj=F6rn
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