KVM

Enable administration of VMs as non root user

Edit file /etc/libvirt/libvirtd.conf.

Uncomment the following lines:

unix_sock_group = "libvirt"
unix_sock_rw_perms = "0770"

Add current user to the libvirt group.

sudo usermod -a -G libvirt $USER

Log out and log in again.

By default the libvirt firewalld zone is used in the host machine for the virtual NIC connected to the VMs' network.