KVM : Storage Migration2022/01/20 |
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 | +----------------------+ +----------------------+ |
[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. |
[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. |
# show the size of Virtual machine [root@kvm01 ~]# qemu-img info /var/kvm/images/centos-st9.img image: /var/kvm/images/centos-st9.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/centos-st9.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. |
[root@kvm01 ~]# virsh start centos-st9 [root@kvm01 ~]# virsh list Id Name State ---------------------------- 1 centos-st9 running
[root@kvm01 ~]#
[root@kvm01 ~]# virsh migrate --live --copy-storage-all centos-st9 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 centos-st9 running |
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