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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