KVM : Live Migration2014/08/12 |
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This is the example to use Live Migration feature for Virtual Machines.
This requires 2 KVM host server and a storage server like follows.
Configure DNS or hosts to resolve names or IP addresses normally, first.
+----------------------+
| [ NFS Servver ] |
| nfs.srv.world |
| |
+-----------+----------+
|10.0.0.30
|
+----------------------+ | +----------------------+
| [ 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. |
| [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] | On KVM Hosts, if SELinux is enabled and also uses NFS shared directory, change rules like follows. |
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[root@kvm01 ~]# setsebool -P virt_use_nfs on
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| [4] | On KVM Hosts, if Firewalld is running, allow ports. |
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[root@kvm01 ~]# firewall-cmd --add-service={libvirt,libvirt-tls} --permanent [root@kvm01 ~]# firewall-cmd --add-port=49152-49215/tcp --permanent [root@kvm01 ~]# firewall-cmd --reload |
| [5] | Create and Start a Virtual Machine on a KVM Host and run Live Migration. |
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# edit setting of a VM root@kvm01:~# virsh edit centos7
<disk type='file' device='disk'>
# add: change cache mode to [none]
<driver name='qemu' type='qcow2' cache='none'/>
<source file='/var/kvm/images/centos7.img'/>
root@kvm01:~# virsh start centos7 root@kvm01:~# virsh list Id Name State ---------------------------------------------------- 1 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 -------------------------------------- |
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