<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <meta name="Generator" content="Microsoft Word 15 (filtered medium)"> <style></style> </head> <body lang="DE" link="#0563C1" vlink="#954F72"> <div class="WordSection1"> Hello,<o:p></o:p> <o:p> </o:p> 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.<o:p></o:p> <o:p> </o:p> I tried it first with samba but it did not work so currently I have configured it as NFS.<o:p></o:p> <o:p> </o:p> This is my current setup:<o:p></o:p> <o:p> </o:p> For Storage: <o:p></o:p> OS: Ubuntu 16.04 beta (to match vHost version), <o:p></o:p> IP: 123.123.123.2<o:p></o:p> NFS: v1.2.8<o:p></o:p> Samba: v4.3.3<o:p></o:p> <o:p> </o:p> For vHost: <o:p></o:p> OS: Ubuntu 16.04 beta (as the Package in Ubuntu 14.04 has still a bug that prevents mounting of samba shares)<o:p></o:p> IP: 123.123.123.3<o:p></o:p> Libvirt: v2.21<o:p></o:p> Qemu: 2.5<o:p></o:p> <o:p> </o:p> Both are simply connected via switched network for testing.<o:p></o:p> <o:p> </o:p> So on the Storage server I created a user and a group called vstorage (uid:1000,gid:500)<o:p></o:p> Then created a folder /pool owned by this user, permission 777<o:p></o:p> And exported it via nfs in /etc/exports:<o:p></o:p> <o:p> </o:p> /pool 123.123.123.3(rw,async,no_subtree_check,all_squash,anonuid=1000,anongid=500)<o:p></o:p> <o:p> </o:p> <o:p> </o:p> On the vHost I defined the pool via XML:<o:p></o:p> <o:p> </o:p> <pool type='netfs'><o:p></o:p> <name>pool</name><o:p></o:p> <source><o:p></o:p> <host name=‘123.123.123.2'/><o:p></o:p> <dir path='pool'/><o:p></o:p> <format type='nfs'/><o:p></o:p> </source><o:p></o:p> <target><o:p></o:p> <path>/var/lib/virt/images</path><o:p></o:p> </target><o:p></o:p> </pool><o:p></o:p> <o:p> </o:p> <o:p> </o:p> When I try to define a volume in the pool, it will always fail if raw format (default) is used.<o:p></o:p> <o:p> </o:p> virsh vol-create-as --pool pool --name test --capacity 512M<o:p></o:p> error: Failed to create vol test<o:p></o:p> error: Failed to create file '/var/lib/virt/images/test': Operation not permitted <o:p></o:p> <o:p> </o:p> In /var/log/syslog I can find the following<o:p></o:p> libvirtd[889]: cannot chown '/var/lib/virt/images/test' to (0, 0): Operation not permitted<o:p></o:p> libvirtd[889]: Failed to create file '/var/lib/virt/images/test': Operation not permitted<o:p></o:p> <o:p> </o:p> When I try it with a different format, like qcow2 it is working fine:<o:p></o:p> <o:p> </o:p> virsh vol-create-as --pool pool --name test --capacity 512M --format qcow2<o:p></o:p> Vol test created<o:p></o:p> <o:p> </o:p> 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.<o:p></o:p> <o:p> </o:p> 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<o:p></o:p> <a href="https://www.ibm.com/developerworks/library/l-using-kvm/">https://www.ibm.com/developerworks/library/l-using-kvm/</a><o:p></o:p> <o:p> </o:p> Maybe someone could shed some light on this? The same error message happens btw. with Samba.<o:p></o:p> <o:p> </o:p> Best regards,<o:p></o:p> <o:p> </o:p> Benjamin Weik<o:p></o:p> </div> </body> </html>