installation and administration Vms on centos

installation and administration Vms on centos
1.Compile qemu
wget http://wiki.qemu.org/download/qemu-0.15.1.tar.gz tar zxf qemu-0.15.1.tar.gz
cd qemu-0.15.1
./configure --prefix=/opt/qemu-0.15.1
make
make install
ln -s /opt/qemu-0.15.1/bin/qemu-nbd /usr/local/bin/
2.Installvirtualization tools
yum install libvirt
yum install virt-manger
3.Install template OS(using "virt-manage" seems easy)
I don't decribe it.you can install any OS step by step by virt-manager.
we assume that the name of disk is ubuntu12.04.img.
I
suggest you rather use raw format for virtual disk as a template image
file.I think "qemu-img" also is a good tool to create an image,like
this:
qemu-img create -f raw ubuntu12.04.img 20G
4.dump VMs and create new
virsh dumpxml ubuntu12.04 >ubuntu2.xml
virsh undefine ubuntu12.04
create a new disk image for the other OS
qemu-img create -f qcow2 -o\ cluster_size=2M,backing_file=ubuntu12.04.img ubuntu2.qcow2 30G
5. mount ubuntu2.qcow2 to change OS settings
yum install kmod-nbd
qemu-nbd -c /dev/nbd0 ubuntu2.qcow2
partprobe /dev/nbd0
fdisk -l /dev/nbd0


mount /dev/nbd0p1 /mnt
Now you should do some work for the new OS
1)change hostname
sed -i "s,127.0.1.1.*,127.0.1.1 ubuntu2,g" /mnt/etc/hosts
sed -i "s,ubuntu,ubuntu2,g" /mnt/etc/hostname

MAC="52:54:$(dd if=/dev/urandom count=1 2>/dev/null \
| md5sum | sed 's/^\(..\)\(..\)\(..\)\(..\).*$/\1:\2:\3:\4/')"

vim /mnt/etc/udev/rules.d/70-persistent-net.rules
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="%MAC%", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
REMEMBER：PLEASE USE MAC TO REPLACE %MAC%
2) set network
vim /mnt/etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 192.168.122.222
netmask 255.255.255.0
broadcast 192.168.122.255
gateway 192.168.122.1
6.umount nbd device
umount /mnt
qemu-nbd -d /dev/nbd0
7.create vm's xml file
cp template.xml ubuntu2.xml
modify "%VM_NAME","%UUID%","%MAC%","%IMAGE_PATH%"
sed -i "s,%VM_NAME,ubuntu2,g" ubuntu2.xml
UUID=`uuidgen`
sed -i "s,%UUID%,$UUID,g" ubuntu2.xml
OK,please refer Section 5 to modify MAC.change "%IMAGE_PATH%" to the path where your image is in.

8.define VM via virsh command
virsh define ubuntu2.xml
virsh start ubuntu2
attention:if you installed kvm by yum,the emulator path is "/usr/libexec/qemu-kvm" not "/usr/bin/kvm" in ubuntu2.xml file.
check the vnc port
virsh vncdisplay ubuntu2

Ok,That's all.you have already been able to create new Vms quickly now.

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