Gluster users - Mar 2009 - mounting glusterfs on /etc/mtab read only

Hi,

we running a cluster of diskless gentoo-systems. Therefore, /etc/mtab is 
linked to /proc/mounts as usual. Trying to mount a glusterfs fails 
because mtab is not writable. Is there by any chance a way to pass '-n' 
or something equivalent to the underlying mount -t fuse process?

The actual workaround we deployed is to link /etc/mtab to a local file 
on a scratch partition, which in my opinion is quite unsatisfying: The 
mount process will succeed but the mounted fs will not appear in the 
linked /etc/mtab.

Enno Lange

Hi Enno,

     Currently there is no such option, we will add it under development
roadmap.

Regards
--
Harshavardhana
"Yantra Shilpi"
Z Research Inc - http://www.zresearch.com



On Sun, Mar 8, 2009 at 6:35 PM, Enno Lange <Enno.Lange at
iem.rwth-aachen.de>wrote:
> Hi,
>
> we running a cluster of diskless gentoo-systems. Therefore, /etc/mtab is
> linked to /proc/mounts as usual. Trying to mount a glusterfs fails because
> mtab is not writable. Is there by any chance a way to pass '-n' or
something
> equivalent to the underlying mount -t fuse process?
>
> The actual workaround we deployed is to link /etc/mtab to a local file on a
> scratch partition, which in my opinion is quite unsatisfying: The mount
> process will succeed but the mounted fs will not appear in the linked
> /etc/mtab.
>
> Enno Lange
>
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://zresearch.com/cgi-bin/mailman/listinfo/gluster-users
>
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Hi,

Keith Freedman wrote:
> why not look into editing /sbin/mount.glusterfs
> if you're mounting through fstab or the mount command that seems the 
> logical place to address this.
The idea would be to copy /proc/mounts to a local filesystem, to which 
/etc/mtab points. After mount succeeded, you have to relink the link to 
/proc/mounts.....

1. /etc/mtab -> /<tmpfs>/mymtab -> /proc/mounts
2. rm /<tmpfs>/mymtab
3. cp /proc/mounts /<tmpfs>/mymtab (creating an empty file should be 
sufficient...)
4. mount glusterfs volume
5. rm /<tmpfs>/mymtab
6. ln -s /proc/mounts /<tmpfs>/mymtab

All these steps should can be implemented in a fail save way in 
/sbin/mount.glusterfs

Cheers
Enno
>
> At 12:31 AM 3/10/2009, Enno Lange wrote:
>> On Monday 09 March 2009 18:46:28 Smart Weblications GmbH - Florian 
>> Wiessner
>> wrote:
>> > why not use tmpfs and link /etc/mtab to tmpfs?
>> This would actually give the same result: You can mount any glusterfs 
>> volume
>> but they will not appear in <linkto>/mtab. Though, they will
appear
>> in /proc/mounts.
>> This is somewhat tricky, as you wont't be able to unmount the
volume
>> gracefully.
>> IMHO this is quite a disadvantage because for any (system-)diskless
>> computation cluster this tricky situation comes up.
>>
>> Another workaround might be to replace /bin/mount with a script, 
>> which keeps
>> the link <linkto>/mtab in sync with /proc/mounts. Will check on
this
>> soon.
>>
>> Enno
>>
>> -- 
>> Dipl.-Ing. Enno Lange, Wissenschaftlicher Mitarbeiter
>> Institut fuer Elektrische Maschinen
>> Lehrstuhl fuer Elektromagnetische Energiewandlung
>> RWTH Aachen, Schinkelstr. 4, D-52056 Aachen
>> Tel. +49 241 80 97644, Fax  +49 241 80 92270
>>
>> _______________________________________________
>> Gluster-users mailing list
>> Gluster-users at gluster.org
>> http://zresearch.com/cgi-bin/mailman/listinfo/gluster-users
>
>
> _______________________________________________
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> Gluster-users at gluster.org
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