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Re: [libvirt-users] [libvirt] Libvirtd running as root tries to access oneadmin (OpenNebula) NFS mount but throws : error: can’t canonicalize path



On Mon, Apr 11, 2016 at 08:02:04PM -0400, TomK wrote:
Hey All,

Wondering if anyone had any suggestions on this topic?


The only thing I can come up with is:
'/var/lib/one//datastores/0/38/disk.1': Permission denied

... that don't have access to that file.  Could you elaborate on that?

I think it's either:

a) you are running the domain as root or

b) we don't use the domain's uid/gid to canonicalize the path.

But if read access is enough for canonicalizing that path, I think the
problem is purely with permissions.

Cheers,
Tom K.
-------------------------------------------------------------------------------------

Living on earth is expensive, but it includes a free trip around the sun.

On 4/9/2016 11:08 AM, TomK wrote:
Adding in libvir-list.

Cheers,
Tom K.
-------------------------------------------------------------------------------------

Living on earth is expensive, but it includes a free trip around the sun.

On 4/7/2016 7:32 PM, TomK wrote:
Hey All,

I've an issue where libvirtd tries to access an NFS mount but errors
out with: can't canonicalize path '/var/lib/one//datastores/0 .  The
unprevilidged user is able to read/write fine to the share.
root_squash is used and for security reasons no_root_squash cannot be
used.

On the controller and node SELinux is disabled.

[oneadmin mdskvm-p01 ~]$ virsh -d 1 --connect qemu:///system create
/var/lib/one//datastores/0/38/deployment.0
create: file(optdata): /var/lib/one//datastores/0/38/deployment.0
error: Failed to create domain from
/var/lib/one//datastores/0/38/deployment.0
error: can't canonicalize path
'/var/lib/one//datastores/0/38/disk.1': Permission denied

I added some debug flags to get more info and added -x to the deploy
script. Closest I get to more details is this:

2016-04-06 04:15:35.945+0000: 14072: debug :
virStorageFileBackendFileInit:1441 : initializing FS storage file
0x7f6aa4009000 (file:/var/lib/one//datastores/0/38/disk.1)[9869:9869]
2016-04-06 04:15:35.954+0000: 14072: error :
virStorageFileBackendFileGetUniqueIdentifier:1523 : can't
canonicalize path '/var/lib/one//datastores/0/38/disk.1':

https://www.redhat.com/archives/libvir-list/2014-May/msg00194.html

Comment is: "The current implementation works for local
storage only and returns the canonical path of the volume."

But it seems the logic is applied to NFS mounts. Perhaps it shouldn't
be?  Anyway to get around this problem?  This is CentOS 7 .

Cheers,
Tom K.
-------------------------------------------------------------------------------------

Living on earth is expensive, but it includes a free trip around the
sun.

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