Ubuntu 16.04
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Live Migration
2016/05/17
 
This is the example to use Live Migration function for virtual machines.
This requires 2 KVM host server and a storage server like follows.
Please set DNS or hosts to resolve names or IP addresses normally, first.
                      +----------------------+
                      |   [  NFS Servver  ]  |
                      |     nfs.srv.world    |
                      |                      |
                      +-----------+----------+
                                  |10.0.0.30
                                  |
+----------------------+          |          +----------------------+
|  [   KVM Host #1  ]  |10.0.0.21 | 10.0.0.22|  [  KVM Host #2   ]  |
|                      +----------+----------+                      |
|   kvm01.srv.world    |                     |    kvm02.srv.world   |
+----------------------+                     +----------------------+

[1]
Configure Storage server which has virtual machine images. For Storage server, it's OK to use NFS, iSCSI, GlusterFS and so on. This example uses NFS Storage server.
[2]
Configure 2 KVM host server and mount a directory provided from Storage server on the same mount point on both KVM server. This example mounts on [/var/kvm/images]. And also, 2 servers need to be resolv hostname or IP address each other via DNS or local hosts file.
[3]
Create and start a virtual machine on a KVM host server.
[4] It's OK all, execute Live Migration like follows on server which virtual machine is running. After finishing it, virtual machine is migrated on another KVM host like follows.
root@kvm01:~#
virsh list

 Id    Name             State
--------------------------------------
 2     ubuntu           running

root@kvm01:~#
virsh migrate --live centos qemu+ssh://10.0.0.22/system

root@10.0.0.22's password:    
# root password
root@kvm01:~#
virsh list

 Id    Name             State
--------------------------------------
# just migrated
### on another KVM Host ###

root@kvm02:~#
virsh list

 Id    Name              State
---------------------------------------
 1     ubuntu            running

# back to the KVM Host again like follows

root@kvm02:~#
virsh migrate --live centos qemu+ssh://10.0.0.21/system

root@10.0.0.21's password:
root@kvm02:~#
virsh list

 Id    Name             State
--------------------------------------

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