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
Note 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.
https://help.ubuntu.com/community/KVM/Virsh
https://www.cyberciti.biz/faq/how-to-rename-kvm-virtual-machine-vm-domain-with-virsh-command/
https://serverfault.com/questions/203311/how-to-rename-a-vm-using-libvirtkvm
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/