get rid of a guest,
virsh undefine virtinstall rm -f /data/kvm/virtinstall.qcow2
to rename a guest,
virsh domrename ... ...
but you might also want to rename the vdisk and change the pointer to it in the same run,
virsh shutdown guest virsh dumpxml guest > lala virsh undefine guest vi lala virsh define lala rm lala
shutdown works only when the guest system is truly up and running. When it’s stuck somewhere or at boot-loader time, you won’t be able to turn it off that way.
How to find the IP address of a KVM Virtual Machine, that I can SSH into it? https://unix.stackexchange.com/questions/33191/how-to-find-the-ip-address-of-a-kvm-virtual-machine-that-i-can-ssh-into-it
How to find ip address of Linux KVM guest virtual machine https://www.cyberciti.biz/faq/find-ip-address-of-linux-kvm-guest-virtual-machine/