KVM : Storage Migration2019/10/08 |
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This is the example to use Storage Migration feature for Virtual Machines.
The different point of Storage Migration from Common Live Migration is
that Storage Migration does not need a Storage server that has Virtual Machine images, when executing Storage Migration,
Virtual Machine image on a KVM host is migrated on another KVM host like follows.
Storage Migration
<------------------->
+----------------------+ +----------------------+
| [ KVM Host #1 ] |10.0.0.21 10.0.0.22| [ KVM Host #2 ] |
| +---------------------+ |
| kvm01.srv.world | | kvm02.srv.world |
+----------------------+ +----------------------+
|
| [1] |
Configure 2 KVM Host Server and Create a Virtual Machine on a KVM Host.
Configure DNS or hosts to resolve names or IP addresses normally, first. |
| [2] | On KVM Hosts, if Firewalld is running, allow ports. |
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[root ~]# firewall-cmd --add-service={libvirt,libvirt-tls} --permanent [root ~]# firewall-cmd --add-port=49152-49215/tcp --permanent [root ~]# firewall-cmd --reload |
| [3] | Show the file size of a Virtual Machine image like follows on a KVM host and next, move to another KVM host to create an empty disk like follows. |
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# show the size of Virtual machine root@kvm01:~# ll /var/kvm/images total 7950652 -rw-------. 1 root root 32217432064 Oct 7 20:54 centos8.img ### on another KVM host ### # create a disk which is the same size of a Virtual Machine root@kvm02:~# qemu-img create -f qcow2 /var/kvm/images/centos8.img 32217432064 root@kvm02:~# ll /var/kvm/images total 196 -rw-r--r--. 1 root root 197096 Oct 8 19:33 centos8.img |
| [4] | That's OK, Run Storage Migration like follows. |
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root@kvm01:~# virsh list Id Name State ---------------------------------------------------- 1 centos8 running
root@kvm01:~#
root@kvm01:~# virsh migrate --live --copy-storage-all centos8 qemu+ssh://kvm02.srv.world/system root@kvm02.srv.world's password: virsh list Id Name State -------------------------------------- # just migrated
### on another KVM host ### root@kvm02:~# virsh list Id Name State ---------------------------------------------------- 1 centos8 running |
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