KVM Live Migration

KVM Live Migration -----

Prerequisites -----

> Minimum 2 KVM Virtulization configured servers
> One Sharetd storage ( NFS / ISCASI / SAN )
> Both the servers are on same network

Note :- I have taken NFS Shared storage for live migration.

Steps to configure KVM live Migration -----

> Configured KVM Virtulization on server.
Follow the follwoing URL to configure KVM Virtulization on Linux server.
http://sappyit.blogspot.in/2015/01/kvm-virtulization-installation-and.html

> Configured NFS Server on network.
Follow the follwoing URL to configure NFS share on Linux server.
http://sappyit.blogspot.in/2015/01/nfs-server-installation-and.html 

>  Make sure Confgured Brige network on both the KVM Servers.
 Follow the follwoing URL to configure KVM Virtulization on Linux server.
http://sappyit.blogspot.in/2015/01/kvm-virtulization-installation-and.html

> Confgure DNS entries for both the KVM host serves.
Command :- #vi /etc/hosts ----- Edit the hosts file on both the KVM host servers and put the following entry.

192.168.116.33 kvm1                       ------ Host Server IP and Hostname
192.168.116.35 kvm2

:wq ----- Save file and exit.

Note :- I have used 192.168.116.X IP series to my KVM host servers.

> Restart Network
Command :- #service network restart

> Configured NFS share directory on both KVM servers.
Command :- #mkdir -p /var/kvm/images     ----- Create images directory on /var/kvm directory on both the servers.
                      #mount <NFS-Share-Directory>:/storage /var/kvm/images  ----- Mount NFS Server /storage directory on /var/kvm/images local server directory of both KVM servers.

> Create and start a virtual machine on a KVM host server.
 Command :- #virt-install --name test1 --ram 1024 --disk path=/var/kvm/images/test1.img,size=10 --vcpu 2 --os-type linux --os-variant rhel6 --network bridge-br0 --graphics none --console pty,target_type=serial --location cdrom /var/kvm/images/rhel6.5.iso       

Note :- I have created Virtual machine on KVM Host server IP:- 192.168.116.35(Hostname :- kvm2 )

The example of options above means like below 


--name         ----- Virtual Machine name
--ram           ----- Memeory for the Virtual Machine 1024 = 1 GB
--disk           ----- Virtual machine disk path and size
--vcpu          ----- No of Virtual CPU for Virtual machine
--os-type      ----- Type of OS line linux / windows
--os-variant  ---- OS version
--network     ---- Type of Network
--graphics     ---- Type of installation
--console       ---- Specify the console type
--location      ---- Specify installation media location to install os in Virtual Machine.

After pressing the Enter key, OS installation process will start on Virtual Machine.

> To check the runing Virtual Machine on KVM Host
Command :- #virsh list    ----- List the runing machine "test1" is runing machine showing in the following screen.

> Migrate runing Virtual Machine to another KVM Host server now.
Command :-#virsh migrate --live test1 qemu+ssh://192.168.116.33/system

192.168.116.33  ( Hostname :- kvm1 ) ----- This is my Target KVM Host server where I am migrating runing Virtual Machine. 
EG :- Source KVM Host server IP is 192.168.116.35 and Target Host server IP is 192.168.116.33

Enter the remote server password to connect.

> Now check the VM list on source server after migarting to destination server.
Command :- #virsh list

Id    Name             State
--------------------------------------
 
No VM is avalable on source KVM Host and VM is successfuly migrated to second host server. 
 
EOF

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