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[libvirt-users] Unable to create raw volume on netfs storage (Operation not permitted)



Hello,

 

we are trying to create a new setup with a centralized storage server. Currently we are running multiple „All-in-One“ hosts using raw volumes stored on the local disk of the server.

 

I tried it first with samba but it did not work so currently I have configured it as NFS.

 

This is my current setup:

 

For Storage:

OS: Ubuntu 16.04 beta (to match vHost version),

IP: 123.123.123.2

NFS: v1.2.8

Samba: v4.3.3

 

For vHost:

OS: Ubuntu 16.04 beta (as the Package in Ubuntu 14.04 has still a bug that prevents mounting of samba shares)

IP: 123.123.123.3

Libvirt: v2.21

Qemu: 2.5

 

Both are simply connected via switched network for testing.

 

So on the Storage server I created a user and a group called vstorage (uid:1000,gid:500)

Then created a folder /pool owned by this user, permission 777

And exported it via nfs in /etc/exports:

 

/pool   123.123.123.3(rw,async,no_subtree_check,all_squash,anonuid=1000,anongid=500)

 

 

On the vHost I defined the pool via XML:

 

<pool type='netfs'>

  <name>pool</name>

 <source>

    <host name=‘123.123.123.2'/>

    <dir path='pool'/>

    <format type='nfs'/>

  </source>

  <target>

    <path>/var/lib/virt/images</path>

  </target>

</pool>

 

 

When I try to define a volume in the pool, it will always fail if raw format (default) is used.

 

virsh vol-create-as --pool pool --name test --capacity 512M

error: Failed to create vol test

error: Failed to create file '/var/lib/virt/images/test': Operation not permitted

 

In /var/log/syslog I can find the following

libvirtd[889]: cannot chown '/var/lib/virt/images/test' to (0, 0): Operation not permitted

libvirtd[889]: Failed to create file '/var/lib/virt/images/test': Operation not permitted

 

When I try it with a different format, like qcow2 it is working fine:

 

virsh vol-create-as --pool pool --name test --capacity 512M --format qcow2

Vol test created

 

I am unable to find the reason for this problem, it also took me quite a while find out that this is a format issue as the error message is actually not really helpful.

 

I found a small guide on setting up KVM from IBM and they are using NFS with raw images, so I’m not sure where the error is

https://www.ibm.com/developerworks/library/l-using-kvm/

 

Maybe someone could shed some light on this? The same error message happens btw. with Samba.

 

Best regards,

 

Benjamin Weik


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