CentOS - Nov 2010 - Re-export an NFS mount from another machine for roaming profiles

Hi,

In my office I have a server running CentOS 5.5. I have Apache+PHP+MySQL running
on that server, and I'm exporting /var/www/html, so I can mount it on my
main
desktop with NFS. 

Server : grossebertha
Desktop : babasse

[root at babasse:~] # mount
/dev/sda3 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sda1 on /boot type ext2 (rw)
/dev/sdb1 on /Disque2 type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
grossebertha:/var/www/html on /home/kikinovak/Sites type nfs 
(rw,rsize=8192,wsize=8192,timeo=14,intr,addr=192.168.1.252)

Now I'm thinking about configuring a few roaming profiles here with NIS/NFS,
using 'babasse' as my main machine. In that case, I would export
babasse's
full /home to the local network, and then configure authentication with NIS. 

I wonder if it can be a problem when one of the directories, in that case 
/home/kikinovak/Sites, is already an NFS mount. I can't really figure it
out,
but I guess I vaguely fear some situation similar to the one displayes in 
"Being John Malkovich", where John Malkovich enters the secret
trapdoor to his
own thoughts.

Thought I'd better ask before doing something silly.

Cheers,

Niki
-- 
http://www.kikinovak.net

At Wed, 10 Nov 2010 13:46:38 +0100 CentOS mailing list <centos at
centos.org> wrote:
> 
> Hi,
> 
> In my office I have a server running CentOS 5.5. I have Apache+PHP+MySQL
running
> on that server, and I'm exporting /var/www/html, so I can mount it on
my main
> desktop with NFS. 
> 
> Server : grossebertha
> Desktop : babasse
> 
> [root at babasse:~] # mount
> /dev/sda3 on / type ext4 (rw)
> proc on /proc type proc (rw)
> sysfs on /sys type sysfs (rw)
> devpts on /dev/pts type devpts (rw,gid=5,mode=620)
> tmpfs on /dev/shm type tmpfs (rw)
> /dev/sda1 on /boot type ext2 (rw)
> /dev/sdb1 on /Disque2 type ext4 (rw)
> none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
> sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
> grossebertha:/var/www/html on /home/kikinovak/Sites type nfs 
> (rw,rsize=8192,wsize=8192,timeo=14,intr,addr=192.168.1.252)
> 
> Now I'm thinking about configuring a few roaming profiles here with
NIS/NFS,
> using 'babasse' as my main machine. In that case, I would export
babasse's
> full /home to the local network, and then configure authentication with
NIS.
> 
> I wonder if it can be a problem when one of the directories, in that case 
> /home/kikinovak/Sites, is already an NFS mount. I can't really figure
it out,
> but I guess I vaguely fear some situation similar to the one displayes in 
> "Being John Malkovich", where John Malkovich enters the secret
trapdoor to his
> own thoughts.
> 
> Thought I'd better ask before doing something silly.
NFS is not going to be happy about exporting a nfs mounted file system
-- actually it just won't do it. If some machine foo mounts
babasse:/home as /nfs/babasse/home, /nfs/babasse/home/kikinovak/Sites
will be an empty directory.  Machine foo would have to mount
grossebertha:/var/www/html on its own.

> 
> Cheers,
> 
> Niki
-- 
Robert Heller             -- 978-544-6933 / heller at deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
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