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Live Migration
2014/08/12 |
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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 |
+----------------------+ +----------------------+
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| [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.
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| [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].
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| [3] |
Create and start a virtual machine on a KVM host server.
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| [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. |
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[root@kvm01 ~]# virsh list Id Name State -------------------------------------- 3 centos7 running
[root@kvm01 ~]#
[root@kvm01 ~]# virsh migrate --live centos7 qemu+ssh://10.0.0.22/system root@10.0.0.22's password: # root password 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: virsh list Id Name State -------------------------------------- |