Send Magic SysRq to a KVM guest using virsh
When a linux computer is "hung" or "frozen" you can use a Magic SysRq key sequence to send various low level requests to the kernel in order to try to recover from or investigate the problem. This is...
View ArticleShare a Folder Between KVM Host and Guest
I often find myself in situations where I need to share information or files between a KVM host and KVM guest. With libvirt version 0.8.5 and newer there is support for mounting a shared folder...
View ArticleGuest Discard/FSTRIM On Thin LVs
In my last post I showed how to recover space from disk images backed by sparse files. As a small addition I'd like to also show how to do the same with a guest disk image that is backed by a thinly...
View ArticleEnabling QEMU Guest Agent anddddd FSTRIM (AGAIN)
In an earlier post I walked through reclaiming disk space from guests using FSTRIM and in a follow up I showed how to do the same thing with thin Logical Volumes as the sparse backing storage for the...
View ArticleFind Guest IP address using QEMU Guest Agent
Ever needed to find the IP address of a particular guest? Of course, the answer is "yes". For the most part I have either resorted to going in through the console of the VM to find this information or...
View ArticleNested Virt and Fedora 20 Virt Test Day
Introduction I decided this year to take part in the Fedora Virtualization Test Day on October 8th. In order to take part I needed a system with Fedora 20 installed so that I could then create VMs on...
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