KVM : Storage Migration2018/05/19 |
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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] | Update QEMU on KVM Host. |
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[root@kvm01 ~]#
/usr/libexec/qemu-kvm -version QEMU emulator version 1.5.3 (qemu-kvm-1.5.3-156.el7), Copyright (c) 2003-2008 Fabrice Bellard
[root@kvm01 ~]#
yum -y install centos-release-qemu-ev # disable on default [root@kvm01 ~]# sed -i -e "s/enabled=1/enabled=0/g" /etc/yum.repos.d/CentOS-QEMU-EV.repo
# for this installing, [qemu-kvm] package is replaced to [qemu-kvm-ev] package [root@kvm01 ~]# yum --enablerepo=centos-qemu-ev -y install qemu-kvm-ev systemctl restart libvirtd [root@kvm01 ~]# /usr/libexec/qemu-kvm -version QEMU emulator version 2.10.0(qemu-kvm-ev-2.10.0-21.el7_5.2.1) Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers |
| [3] | 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 |
| [4] | 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 1344456 -rw-------. 1 root root 32217432064 May 19 23:44 centos7.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/centos7.img 32217432064 root@kvm02:~# ll /var/kvm/images total 196 -rw-r--r--. 1 root root 197120 May 20 00:19 centos7.img |
| [5] | It's OK all, Run Storage Migration like follows. |
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root@kvm01:~# virsh list Id Name State ---------------------------------------------------- 1 centos7 running
root@kvm01:~#
root@kvm01:~# virsh migrate --live --copy-storage-all centos7 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 ---------------------------------------------------- 1 centos7 running # back to another host, it's OK to execute normal Live Migration 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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