A kvm image can be created on any linux system. The page describes how to install a kvm image using the virt-manager gui. Alternatively, the command line tool virsh could be used.
The following packages are needed:
It is recommanded to use a CPU with virtualization support:
egrep '^flags.*(vmx|svm)' /proc/cpuinfo
Make sure libvirtd is running:
Prepare a network bridge:
RedHat (CentOS, Fedora)
DEVICE=br0 TYPE=Bridge BOOTPROTO=dhcp ONBOOT=yes NM_CONTROLLED=no
DEVICE=eth0 HWADDR=00:11:22:33:44:55 ONBOOT=yes NM_CONTROLLED=no BRIDGE=br0
brctl addbr br0 brctl addif br0 eth0 brctl show bridge name bridge id STP enabled interfaces br0 0080.000000000000 no eth0 ifup br0
Note that the NetworkManager does not support bridges.
Installation of Image
- Start virt-manager (as superuser) and click on 'Create a new virtual machine' button:
- Enter a name for your VM and choose the type of installation of the OS. This example will show how to install CentOS6 with an netinstall iso image. Choose Local install media and click forward.
- Enter the local path to the netinstall iso image and choose the OS type and version.
- Choose the memory and number of CPUs for your VM.
- Choose the size of your virtal hard disk:
- Click Finish to create your image file and to boot the VM from the netinstall iso image.
- Follow the OS installation instructions
- CentOS installation method: URL
- Enable IPv4 support and get a dynamic or manual IP (depends on your network environment)
- Enter URL of CentOS packages.
- It is recommanded to create a physical volume as last partition on the virtual dist, because this allows to extend the image size later. Example partition layout:
-first partition: ext4, 2 GB, mount point /
-second partition: lvm, free space
-logical volumes: /usr, swap, /tmp, /home, /var
Converting an Image
- Converting a raw image to qcow2:
qemu-img convert -O qcow2 myraw.img myqcow2.qcow2