What are the effects for using sudo for libvirt commands such as virt-manager/virsh? Will it affect something later when using the created VMs and regret not using it before?
I'm trying to use them without sudo (don't use root when you can ) and everything is fine. (Except for using bridged network - BTW not sure whether the problem is indeed sudo related at all)
But many articles such as this use sudo in many cases, why?
For all general virsh operations, sudo shouldn't be necessary. (As long as the user is in the libvirt group).
Certain configuration will require sudo - for example, the configuration files in /etc/libvirt is "rw" for root, while permissions are "r" for other users.
Some operations will also require sudo, like PCI passthrough and USB - since hardware access control will require direct control to physical devices, which libvirt does not have.
