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

[Yong Sheng Gong]

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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