Creating a new libvirt Virtual Machine from the command line with virt-install

Scenario: a remote Linux server with many CPUs and lots of RAM is your virtual host. You want to create a new guest virtual machine and you want access via VNC to the installation process. In my case, I was using KVM as the hypervisor, but libvirt should work seamlessly with Xen and LXC too.

First thing, I created the disk image for my VM, then I started the installation with virt-install:

# qemu-img create -f qcow2 /var/lib/libvirt/images/my-virt-machine.img 100G
# virt-install --name "MyVirtMachine" --vcpus 1 --ram 512 \
--disk /var/lib/libvirt/images/my-virt-image.img \
--cdrom /var/lib/libvirt/images/ubuntu-12.04.1-server-amd64.iso 
--os-type linux --network network=default \
--graphics=vnc,password=trustworthypass,listen=0.0.0.0,port=5903

Let’s see what’s happening:

  • –name “MyVirtMachine”: your virtual machine’s name
  • –vcpus 1: number of CPUs available to the VM
  • –ram 512: megabytes of memory available to the VM
  • –disk /var/[…].img: the path to the disk image
  • –cdrom /var/[…].iso: the path to the ISO image of the installation disk
  • –os-type linux: the OS we will install on the VM
  • –network network=default: configure the VM to use the default network provided by libvirt
  • –graphics=vnc,password=trustworthypass,listen=0.0.0.0,port=5903: connect the VM to a VNC server listening on every interface (0.0.0.0) on port 5903 with password trustworthypass

Now you can connect to the IP address of your hypervisor on port 5903 with a VNC client to complete the installation.

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