Changing the default connect URI in libvirt

All the libvirt related commands, like virsh, virt-viewer or virt-install take a connect URI as parameter. The connect URI can be thought as specifying which set of virtual machines you want to control with that command, which physical machine to control, and how.

For example, I can use a command like:

virsh -c "xen+ssh://admin@corp.myoffice.net" start web-server

to start the web-server virtual machine on the xen cluster running at myoffice.net, by connecting as admin via ssh to the corresponding server.

If you don't specify any connect URI to virsh (or any other libvirt related command), by default libvirt will try to start a VM running as your username on your local machine (eg, qemu:///session). This unless you are running as root, in which case libvirt will try to run the image as a system image, not tied to any specific user (eg, qemu:///system).

I generally run most of my VMs as system VMs, and systematically forget to specify which connect URI to use to commands like virsh or virt-install. What is more annoying is that some of those commands take the URI as -c while others as -C.

However, turns out that most of those commands rely on libvirt, and that libvirt itself looks at LIBVIRT_DEFAULT_URI to pick the default connect URI.

All I had to do to have all of those commands use qemu:///system as default was to edit my .bahsrc to have:

export LIBVIRT_DEFAULT_URI="qemu:///system"

logout, login again, and enjoy!


Other posts

  • From PDF to interactive map Let's say you are thinking about moving to Rome in the near future. Let's say you have family, and you want to find all daycares within 30 mins by pu...
  • Flying with babies, how we survived A bit more than a year ago I became the proud parent of the cutest little girl in the world. By living abroad and traveling often, the little one had...
  • When cardboard boxes are better than suitcases Have you ever had to pay extra fees to carry oversize luggage? Flown somewhere, ended up buying so many things that they did not fit your suitcase any...
  • Hanging clothes in windy weather Some say that clothes smell and look better when dried with sunlight in the summer breeze. I can certainly state that if you have to pay to use a dr...
Life