KVM : Storage Migration2023/02/28 |
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This is the example to use Storage Migration feature for Virtual Machines.
The different point of Storage Migration from the 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 ] |10.0.0.30 10.0.0.51| [ 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.
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@kvm01 ~]# firewall-cmd --add-service={libvirt,libvirt-tls} [root@kvm01 ~]# firewall-cmd --add-port=49152-49215/tcp [root@kvm01 ~]# firewall-cmd --runtime-to-permanent |
| [3] | Confirm 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 image like follows. |
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# show the size of Virtual machine [root@kvm01 ~]# qemu-img info /var/kvm/images/almalinux9.img
image: /var/kvm/images/almalinux9.img
file format: qcow2
virtual size: 20 GiB (21474836480 bytes)
disk size: 5.15 GiB
cluster_size: 65536
Format specific information:
compat: 1.1
compression type: zlib
lazy refcounts: true
refcount bits: 16
corrupt: false
extended l2: false
### on another KVM host ### # create a disk which is the same size of a Virtual Machine [root@kvm02 ~]# qemu-img create -f qcow2 -o preallocation=falloc /var/kvm/images/almalinux9.img 21474836480 |
| [4] | That's OK, Run Storage 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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[root@kvm01 ~]# virsh start almalinux9 [root@kvm01 ~]# virsh list Id Name State ---------------------------- 1 almalinux9 running
[root@kvm01 ~]#
[root@kvm01 ~]# virsh migrate --live --copy-storage-all almalinux9 qemu+ssh://kvm02.srv.world/system virsh list Id Name State -------------------- # just migrated
### on another KVM host ### [root@kvm02 ~]# virsh list Id Name State ---------------------------- 1 almalinux9 running |
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