This is the example to use Live Migration function

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.server.world | | | +-----------+----------+ |10.0.0.30 | +----------------------+ | +----------------------+ | [ KVM Host #1 ] |10.0.0.21 | 10.0.0.22| [ KVM Host #2 ] | | +----------+----------+ | | kvm01.server.world | | kvm02.server.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].
[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 -------------------------------------- 3 centos7 running [root@kvm01 ~]#  virsh migrate --live centos7 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 centos7 running # back to the KVM Host again like follows [root@kvm02 ~]#  virsh migrate --live centos7 qemu+ssh://10.0.0.21/system  root@10.0.0.21's password: [root@kvm02 ~]#  virsh list  Id Name State --------------------------------------