KVM : Storage Migration2018/05/18 |
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This is the example to use Storage Migration function for virtual machines.
The different point of Storage Migration from Live Migration is that
Storage Migration does not need a Storage server which 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 |
+----------------------+ +----------------------+
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| [1] |
Configure 2 KVM Host Server and Create a Virtual Machine on a KVM Host.
2 KVM Host Servers need to be resolv hostname or IP address each other via DNS or local hosts file. |
| [2] | Show the file size of a Virtual Machine image like follows on a KVM host and move to another KVM host, create a empty disk like follows. |
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# show the size of Virtual machine root@kvm01:~# ll /var/kvm/images total 5201608 drwxr-xr-x 2 root root 4096 May 16 20:48 ./ drwxr-xr-x 3 root root 4096 May 16 20:21 ../ -rw------- 1 root root 32217432064 May 17 20:12 ubuntu1804.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/ubuntu1804.img 32217432064 root@kvm02:~# ll /var/kvm/images total 204 drwxr-xr-x 2 root root 4096 May 19 20:43 ./ drwxr-xr-x 3 root root 4096 May 19 19:18 ../ -rw-r--r-- 1 root root 197096 May 19 20:43 ubuntu1804.img |
| [3] | It's OK all, execute Storage Migration like follows. |
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root@kvm01:~# virsh list Id Name State ---------------------------------------------------- 1 ubuntu1804 running
root@kvm01:~#
root@kvm01:~# virsh migrate --live --copy-storage-all ubuntu1804 qemu+ssh://10.0.0.22/system root@10.0.0.22's password: virsh list Id Name State -------------------------------------- # just migrated
### on another KVM host ### root@kvm02:~# virsh list Id Name State ---------------------------------------------------- 2 ubuntu1804 running # back to another host, it's OK to execute normal Live Migration root@kvm02:~# virsh migrate --live ubuntu1804 qemu+ssh://10.0.0.21/system root@10.0.0.21's password: virsh list Id Name State -------------------------------------- |
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