Re: [Openstack] KVM cannot start vm when the disk is on NFS

[Yong Sheng Gong]

Thanks for the reply.

I have figured it out.

I am running nova control node with root account on the side of nfs4 server side (redhat6.1), while on the side of compute node is ubuntu.

So on ubuntu side, I have executed:
$sudo bash,
#nova-compute

In fact what I need to do is to let kvm binary run under root user id.
I found the solution from http://libvirt.org/drvqemu.html.

Here are what I did on ubuntu side:
#chown root:root /var/run/libvirt/qemu  /var/lib/libvirt/qemu  /var/cache/libvirt/qemu

edit /etc/libvirt/qemu.conf

# The user ID for QEMU processes run by the system instance.
user = "root"

# The group ID for QEMU processes run by the system instance.
group = "root"

after restarting libvirt-bin, nova-compute can provision vm from the images on NFS share dir now.

-----Razique Mahroua <razique.mahr...@gmail.com> wrote: -----

To: Yong Sheng Gong/China/IBM@IBMCN
From: Razique Mahroua <razique.mahr...@gmail.com>
Date: 03/29/2012 06:00PM
Cc: "openstack@lists.launchpad.net (openstack@lists.launchpad.net)" <openstack@lists.launchpad.net>
Subject: Re: [Openstack] KVM cannot start vm when the disk is on NFS

Hello Yong,

as you may understand, the chmod 777 is not the best thing to do.

it looks like the files belong to the user root, while it's the user nova which runs the cloud.

The first thing to do is to give the rights to the user nova of the directory (755) to nova:nova.

Thanks!

Nuage & Co - Razique Mahroua 

razique.mahr...@gmail.com

Le 29 mars 2012 à 09:50, Yong Sheng Gong a écrit :

I have to run chmod 777 /var/lib/nova/instances/instance-00000007 to start the vm on kvm. Appreciate any help from stackers.

• HostA ( 192.168.1.90): redhat 6.1 nfs4

/etc/exports:

/var/lib/nova/instances 192.168.1.0/24(rw,sync,fsid=0,no_root_squash)

/etc/idmapd:

[General]
Domain = openstack

#service nfs restart
#service rpcidmapd restart

• HostB ( 192.168.1.94): ubuntu 11.10

#sudo bash

/etc/idmapd:

[General]

Verbosity = 0
Pipefs-Directory = /var/lib/nfs/rpc_pipefs
Domain = openstack

/etc/fstab:

192.168.1.90:/ /var/lib/nova/instances nfs4 defaults 0 0

#mount -a -v
root@openubuntu:/var/lib/nova/instances/instance-00000007# ll
total 14168
drwxr-xr-x 2 root   root       4096 2012-03-29 14:23 ./
drwxr-xr-x 9 nobody nogroup    4096 2012-03-29 14:21 ../
-rw-rw---- 1 root   root          0 2012-03-29 14:17 console.log
-rw-r--r-- 1 root   root    6291968 2012-03-29 14:18 disk
-rw-r--r-- 1 root   root    4404752 2012-03-29 14:18 kernel
-rw-r--r-- 1 root   root       1619 2012-03-29 14:17 libvirt.xml
-rw-r--r-- 1 root   root    5882349 2012-03-29 14:18 ramdisk
root@openubuntu:/var/lib/nova/instances/instance-00000007# virsh start instance-00000007
error: Failed to start domain instance-00000007
error: internal error Process exited while reading console log output: chardev: opening backend "file" failed

root@openubuntu:/var/lib/nova/instances/instance-00000007# chmod 777 console.log
root@openubuntu:/var/lib/nova/instances/instance-00000007# virsh start instance-00000007
error: Failed to start domain instance-00000007
error: internal error Process exited while reading console log output: char device redirected to /dev/pts/3
kvm: -drive file=/var/lib/nova/instances/instance-00000007/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none: could not open disk image /var/lib/nova/instances/instance-00000007/disk: Permission denied

root@openubuntu:/var/lib/nova/instances/instance-00000007# chmod 777 *
root@openubuntu:/var/lib/nova/instances/instance-00000007# virsh start instance-00000007
Domain instance-00000007 started


Thanks
Yong Sheng Gong

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