unionfs pres / vrchni vrstva na vzdalenem NFS serveru

[Daniel Dvořák]

Ahoj vsichni,

muzete mi poradit zdali to co zamyslim je realne a je to mozno realizovat ?

Jde o nasledujici, mam nainstalovano fbsd-6-stable s poslednim diff-19
patchem pro unionfs a prekompilovany kernel s novym unionfs
a chtel bych nasledujici:

/dev/ad0s1a  je read only po celou dobu
v /rc.conf je zakazano vytvaret mdconfigem var a tmp oddíl
do adresare /unionfs je namoutovan vzdaleny NFS adresar s pravem
zapisovat, no_all_squash ci no_root_squash, sync atd.
unionfs ma mit vrchni vrstvu ukladanou prave na ten NFS
spodni je cely / v ro

kdyz jsem zkusil spustit po namoutovani nfs do /unionfs adresare
tento prikaz objevila se hlaseni se kterym si nevim rady asi proto ze
neco delam spatne.


The mount_unionfs utility attaches directory above uniondir in such a way
that the contents of both directory trees remain visible.  By default,
directory becomes the upper layer and uniondir becomes the lower layer.

takze directory je tu /unionfs
a spodni vrstva je tu cely /

# mount -t unionfs /unionfs /
mount_unionfs: /unionfs (/unionfs) and / (/) are not distinct paths

# mount -t unionfs /unionfs /dev/ad0s1a po vrozu s cdromkou
mount: /dev/ad0s1a: not a directory

nicmene pro /var
# mount -t unionfs /unionfs /var

# mount
/dev/ad0s1a on / (ufs, NFS exported, local)
devfs on /dev (devfs, local)
/dev/ad0s2a on /free (ufs, local, soft-updates)
procfs on /proc (procfs, local)
<above>:/unionfs on /var (unionfs, local)
NFS:/home/buffer on /unionfs (nfs)


Tak to vypada, ze postupovat takto s celym mount pointem / asi nelze co ?

S pozdravem

Dan