On Tue, Jul 23, 2013 at 06:19:06PM +0800, Indra Pramana wrote: > Dear Prasanna and all, > > I have tried to remove the host from CloudStack, uninstall and reinstall > cloudstack-agent and added the host back into CloudStack. The "cloud" > user-id is still not yet created. I then tried to add the "cloud" user > manually, using exactly the same credentials as the "cloud" user on the > other host. > > >From the host, I tried to do a virsh connect qemu+ssh to the other host > using the "cloud" user (instead of root), and getting this error: > > cloud@hv-kvm-01:~$ virsh --connect qemu+ssh://cloud@10.237.3.22/system list > cloud@10.237.3.22's password: > error: failed to connect to the hypervisor > error: no valid connection > error: End of file while reading data: : Input/output error > > If you notice, the error is the same exact error message I see on the > management-server.log when I tried to do a live migration of VM. So I tried > to follow this lead and implement this instruction to allow the "cloud" > user to have access to the hypervisor on the other host: > > http://wiki.libvirt.org/page/SSHSetup > > usermod -G libvirtd -a cloud > > Enabled these on /etc/libvirt/libvirtd.conf: > > unix_sock_group = "libvirtd" > unix_sock_rw_perms = "0770" > > I also copied the SSH keys of the cloud user to the other host, so that it > will not prompt for password. > > And I am now able to do a virsh connect using the "cloud" user: > > cloud@hv-kvm-01:~$ virsh --connect qemu+ssh://cloud@10.237.3.22/system list > Id Name State > ---------------------------------------------------- > 2 i-2-275-VM running > 3 i-2-276-VM running > 4 i-2-293-VM running > > But I am still not able to perform live migration of VM. > > May I know how CloudStack connects to the hypervisors when it performs live > migration, after finding a suitable target host? Does it request the source > host to perform a qemu+ssh connect to the target host? >
I'm not sure about the specifics here. Perhaps someone else will chime in - But from looking at the resource for KVM in cloudstack it appears the libvirt XML contains a qemu+tcp:// connection on migrate. Can you tell us if the KVM hosts share the same management subnet? Are they in the same cluster as CloudStack denotes a cluster? Is there a way to trap the XMLs sent to the KVM resource in the libvirt logs? I'd try to enable that if so. -- Prasanna., ------------------------ Powered by BigRock.com
