$ sudo su -
$ class-number 21
$ reboot
$ sudo su -
$ dnf install virt-manager
$ ssh-keygen
$ ssh-copy-id root@10.6.21.11
$ dnf install -y cockpit cockpit-ws cockpit-machines
$ reboot
$ curl -OJL http://mirror01.idc.hinet.net/centos/7/isos/x86_64/CentOS-7-x86_64-Minimal-2003.iso
$ cp CentOS-7-x86_64-Minimal-2003.iso /var/lib/libvirt/images
$ nmtui
10.6.21.70
$ ip a
$ ping 10.6.21.5
$ ping 10.6.21.11