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

TomK tk at mdevsys.com
Sat Apr 9 15:08:19 UTC 2016


Adding in libvir-list.

Cheers,
Tom K.
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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 at 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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