Zdravim, od FreeBSD 11.0 je mozne remountnut root (reboot -r) (http://www.freebsd.cz/news/status/report-2015-10-2015-12.html#Root-Remount).
Trochu jsem se s tim hral - da se rerootovat na NFS root - vhodne napriklad kdyz nefunguje PXE boot - da se rerootovat na temporary memory filesystem, predelat rootfs napriklad z UFS na ZFS a rerootovat zpet (https://people.freebsd.org/~lidl/blog/re-root.html) - da se rerootovat na sifrovany filesystem, predem odemceny pres geli attach Ted zkousim ten posledny pripad. Mam nesifrovany ZFS pool (base), do ktereho nabootuju, tam pripojim sifrovany ZFS pool (private) a pak do nej rerootuju. Ale nastava problem, ze pred rerootem se ten base pool neodmontuje cely (jenom root) a nove filesystemy jsou namontovane pres ty stare: private/ROOT/default on / (zfs, local, noatime, nfsv4acls) devfs on /dev (devfs, local, multilabel) base/home on /home (zfs, local, noatime, nfsv4acls) private/home on /home (zfs, local, noatime, nfsv4acls) private/tmp on /tmp (zfs, local, noatime, nfsv4acls) base/tmp on /tmp (zfs, local, noatime, nfsv4acls) base/var/crash on /var/crash (zfs, local, noatime, nfsv4acls) private/var/crash on /var/crash (zfs, local, noatime, nfsv4acls) base/var/log on /var/log (zfs, local, noatime, nfsv4acls) private/var/log on /var/log (zfs, local, noatime, nfsv4acls) base/var/mail on /var/mail (zfs, local, noatime, nfsv4acls) private/var/mail on /var/mail (zfs, local, noatime, nfsv4acls) private/var/tmp on /var/tmp (zfs, local, noatime, nfsv4acls) base/var/tmp on /var/tmp (zfs, local, noatime, nfsv4acls) Nevite, jak lze zabezpecit, aby se to kompletne odmontovalo? U rerootu z UFS na ZFS se UFS odmontuje cele. IMHO to vypada na bug. Z manualove stranky reboot(8): -r The system kills all processes, unmounts all filesystems, mounts the new root filesystem, and begins the usual startup sequence. After changing vfs.root.mountfrom with kenv(1), reboot -r can be used to change the root filesystem while preserving kernel state. This requires the tmpfs(5) kernel module to be loaded because init(8) needs a place to store itself after the old root is unmounted, but before the new root is in place. Je tam uvedeno "unmounts all filesystems". Marian -- FreeBSD mailing list (users-l@freebsd.cz) http://www.freebsd.cz/listserv/listinfo/users-l
