Re: [Users] Can't add NFS domain
On 09/07/2012 07:03 AM, Changsen Xu wrote:
On Tue, 2012-09-04 at 08:19 +0200, Damiano Verzulli wrote:
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(so you've switched discussing on the list. Ok. Let's go this way)
Il 04/09/2012 07:45, Changsen Xu ha scritto:
[...] I just got vdsm compiled and installed on fresh FC17 (installed
with live cd), used your 3.4.9 FC16 kernel. Yes, now, engine can add
it as host, great. But engine still can't add NFS domain. Any idea
what is happening?
To correctly troubleshoot your issues, please, ensure you're following
_all_ the steps suggested here:
http://wiki.ovirt.org/wiki/Troubleshooting_NFS_Storage_Issues
In particular:
1 - confirm your node are running the 3.4 kernel (uname -a), as
installing the new kernel is not enough. Such kernel _must_ be running;
2 - confirm that your NFS server is configured:
- to default to NFSv3 (refer to above wiki page);
- with a correct export (refer to above wiki page). Please pay attention
to the need of having, on the NFS server, a USER with UID 36. Best if
related username is vdsm;
I've playing with this problem for several days, done every step
I can find on internet, just can't figure out why.
On my node/host, if I su - vdsm -s /bin/bash, I can't
never use mount. It always complained only root can use mount.
I can use root to mount nfs server manually, but just can't add
NFS domain in the engine side. I tried both ovirt 3.1 and 3.0, neither
worked.
I used /etc/hosts file on all engine, hosts, nfs server. Should I use
DNS ?
only root can use mount.
vdsm uses sudo or vdsm super process (don't remember if it was changed
already) to do the mount.
when you do it from the engine, it asks vdsm to do it.
can you share the vdsm logs from trying to add the nfs storage domain
via the engine?
3 - confirm that your FC17-nodes can see the exported mounts from the
NFS server by running, on the nodes:
# showmount -e ip_addr_of_the_NFS_server
When all of above steps are confirmed, you can start troubleshooting
file-permission issues. In detail:
4 - from the FC17-node, manually mount the NFS share with something like:
# mount -t nfs NFS_server_ip_addr:NFS_mount temp_mount_point
(in my case: mount -t nfs 10.0.49.14:/storage/NFS /tmp/test_nfs)
and then try to:
- write a file in /tmp/test_nfs:
# touch /tmp/test_nfs/test_file.txt
and rightafter check, on the NFS server, its ownership/permission. As
said in the wiki page, the test_file.txt should be owned by UID 36 user
and should have 755 file-permission
5 - when the all of this is (succesfully) completed, you can retry adding
the NFS ISO-domain from the Engine.
BTW: if a previous addition attempt failed, in my case I needed to
manually remove, on the NFS server, the file/directory structure that
previous attempts generated.
HTH
Bye,
DV
P.S.: please, let's stick discussing on the list.
- --
Damiano Verzulli
e-mail: dami...@verzulli.it
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possible?ok:while(!possible){open_mindedness++}
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Technical people tend to fall into two categories: Specialists
and Generalists. The Specialist learns more and more about a
narrower and narrower field, until he eventually, in the limit,
knows everything about nothing. The Generalist learns less and
less about a wider and wider field, until eventually he knows
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http://elists.isoc.org/mailman/private/pubsoft/2007-December/001935.html
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Re: [Users] Can't add NFS domain
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Il 07/09/2012 06:03, Changsen Xu ha scritto:
[...] 2 - confirm that your NFS server is configured: - to default to
NFSv3 (refer to above wiki page); - with a correct export (refer to
above wiki page). Please pay attention to the need of having, on the
NFS server, a USER with UID 36. Best if related username is vdsm;
I've playing with this problem for several days, done every step I
can find on internet, just can't figure out why.
On my node/host, if I su - vdsm -s /bin/bash, I can't never use
mount. It always complained only root can use mount.
You _cannot_ mount as vdsm users, as generally only root can mount.
The vdsm will do the mount as root, thanks to sudo features. In my
case, for example, the vdsm log say:
- --
Thread-694::DEBUG::2012-09-02
22:23:06,813::__init__::1164::Storage.Misc.excCmd::(_log) '/usr/bin/sudo
- -n /bin/umount -f -l /rhev/data-center/mnt/10.0.49.14:_mnt_STORAGE_NFS'
(cwd None)
- --
Even if the mount will be done as root, it will be the vdsm user that
will write to the NFS share. Hence, on the NFS-server-side, you need
write permission for user with UID-36.
That's why you have to take care, on the NFS-server side, that:
- - the NFS server is configured to map _all_ anonymous (see below) write
request as if they are made by (local to the NFS server) UID 36 = cfr.
anonuid/anongid option for /etc/exports file (see man exports).
Consider that, if I'm right, a write request is considered anonymous if
it is not possible to reverse-lookup the UID traveling inside NFS-write
request, into a username mapped within the (local to the NFS server)
/etc/passwd file.
and to avoid any potential misunderstanding:
- - the NFS server has a local user with UID 36 defined (as well as a local
gid with GID 36). This is not strictly required, but helps during
troubleshooting activities, as you see the same username both within the
client, and the server.
To add further complexity... let me add that when I had NFS problems on
my side
I can use root to mount nfs server manually, but just can't add NFS
domain in the engine side.
... I was:
- - perfectly able, with exactly the very-same sudo command, and from the
vdsm account, to manually mount the NFS-share (again: with
cut-and-paste from the log-file);
- - afterwards, to read/write to the NFS share, with vdsm user/permission.
Even during the few-seconds interval, after the ADD ISO DOMAIN click,
and before the error showed in the web-interface, I correctly saw the
NFS-remote filesystem, locally mounted on the ovirt-node. So,
technically, the node is perfectly able to mount the NFS share.
But then, unfortunatly, something goes wrong and... the web-app due to
this, take care to umount the NFS. I'm supposing this as, magically,
the previously mounted NFS-share, simply disappeared :-(
This, at least, in my case.
Bye,
DV
- --
Damiano Verzulli
e-mail: dami...@verzulli.it
- ---
possible?ok:while(!possible){open_mindedness++}
- ---
Technical people tend to fall into two categories: Specialists
and Generalists. The Specialist learns more and more about a
narrower and narrower field, until he eventually, in the limit,
knows everything about nothing. The Generalist learns less and
less about a wider and wider field, until eventually he knows
nothing about everything. - William Stucke - AfrISPA
http://elists.isoc.org/mailman/private/pubsoft/2007-December/001935.html
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