KVM : Live Migration2021/08/27 |
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This is the example to use Live Migration feature for Virtual Machines.
It requires 2 KVM host server and also a storage server like follows.
Configure DNS or hosts to resolve names or IP addresses normally, first.
+----------------------+
| [ NFS Servver ] |
| nfs.srv.world |
| |
+-----------+----------+
|10.0.0.35
|
+----------------------+ | +----------------------+
| [ 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] | |
| [2] |
Configure 2 KVM host server and mount a directory provided from Storage server on the same mount point on both KVM server.
It uses [/var/kvm/images] for mount point on this example. |
| [3] | Create and Start a Virtual Machine on a KVM Host and run Live Migration like follows. For connection between KVM Hosts, they connects to others with SSH, so it had better to set SSH key-pair with root account before running live migration. |
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# edit the setting of a VM you'd like to run live migration root@kvm01:~# virsh edit debian11
<disk type='file' device='disk'>
# add : change cache mode to [none]
<driver name='qemu' type='qcow2' cache='none'/>
<source file='/var/kvm/images/debian11.img'/>
root@kvm01:~# virsh start debian11 root@kvm01:~# virsh list Id Name State -------------------------- 1 debian11 running
root@kvm01:~#
root@kvm01:~# virsh migrate --live debian11 qemu+ssh://10.0.0.22/system virsh list Id Name State -------------------------- # just migrated
### on another KVM Host ### root@kvm02:~# virsh list Id Name State -------------------------- 1 debian11 running # back to the KVM Host again like follows root@kvm02:~# virsh migrate --live debian11 qemu+ssh://10.0.0.21/system virsh list Id Name State -------------------------- |
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