We have a Windows 7 VM running on Ubuntu KVM. I needed to give the Windows 7 machine more disk space. This turns out to be really easy (when you know how). Step 1 – Shutdown the VM Step 2 – Increase the qcow2 image Find the qcow2 file of the VM and take a … Read more
If you are creating a KVM host you can sometimes get the error such XML error: expected unicast mac address. Basically, you if you have manually entered a mac address which meets the Unicast standard then it will cause problems. Here is a quick way of generating a proper MAC Address:
I just started to install an Ubuntu 13.10 KVM guest – however the build process failed. The command that I was using was: However, I got this error message: Basically, you just need ensure the the linux-image-generic package (i.e. a kernel which supports non-PAE CPU’s) is installed by setting the addpkg flag like so: I … Read more
We’ve had a problem with some of our KVM Virtual machines where the network connection just disappears. The vm is still running but essentially it’s unreachable over the network (just like if you have pulled out the network cable of real computer). Until, I found the fix, I had to connect to the VM using … Read more
It is very easy to convert a VirtualBox .vdi disk images to KVM qcow2 file. You have to use the RAW file format as an intermediate. 1 – Make sure the VirtualBox machine is shutdown. 2 – Convert the vdi to a raw disk images. Note: vdi are compressed and raw images are not and … Read more
This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running. Step 1 – Enable NBD on the Host You will need to enable the nbd (network block device) kernel module on the host. This … Read more
I just upgrade Ubuntu on one of my virtual machines and for some reason the file system was corrupted after I rebooted the server. I got errors like: ext4-fs error ext4_lookup deleted inode referenced Great. Here is how I fixed the problem. I found the solution was to attach the qcow2 file as a device … Read more
I just exported / copied a virtual machine from one of our servers (a HP Proliant) to my laptop so that I could to mess around with it offline. I used the following commands to export the domain. On the server: On the laptop: However, I got this error on the laptop: error: unsupported configuration: … Read more
I was trying to setup a KVM host with some KVM virtual machines on Ubuntu 13.04 Server. It was a fresh install on a HP DL360. However, there seemed to be a fundamental problem with KVM / virsh / virt-install. When trying to install a virtual machine using virt-install with this command. I get this … Read more