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Synopsis:
The virt-manager tool is a graphical frontend to manage KVM, Xen or QEMU virtual machines, running either locally or remotely. It also works with lxc containers. While it may not win any prizes for its graphical design, it's a very useful and powerful piece of software.
For hypervisors and alternative manager, see Virtualisation.


Installation

/bin/su -c "dnf install virt-manager"

or

/bin/su -c "urpmi virt-manager"

It will automatically pull all dependencies such as qemu-kvm

After that you have to enable the libvirt daemon at boot time:

systemctl enable libvirtd

Start this daemon with:

systemctl start libvirtd

Permissions

As a normal user you don't have the right permissions to do anything, and it's difficult to get them. First add yourself to the kvm group:

/bin/su -c "usermod -aG kvm $USER"

and create a file /etc/polkit-1/rules.d/50-libvirt.rules with the following content:

/* Allow users in kvm group to manage the libvirt
daemon without authentication */
polkit.addRule(function(action, subject) {
    if (action.id == "org.libvirt.unix.manage" &&
        subject.isInGroup("kvm")) {
            return polkit.Result.YES;
    }
});


Logout, and you are ready to create virtual machines

Virtual Machines in Home

If you want to create a storage pool in your home directory, you have to add permissions on your home directory for the kvm group

/bin/su -c "setfacl -m g:kvm:rwx $HOME"

Shorewall

If you have enabled the Shorewall firewall, traffic from the virtual machine will be blocked.

Edit /etc/shorewall/interfaces and add the following lines:

virt	     	virbr1  	detect			dhcp,routeback
virt		vnet+		detect			destonly

Edit /etc/shorewall/zones and add the following line:

virt	ipv4

Edit /etc/shorewall/policy and add the following line:

virt	all	ACCEPT  info
fw      virt    ACCEPT

Restart Shorewall:

/bin/su -c "shorewall restart"