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# Restart your c7host virtual machine. If you fail to do this, you may experience virtualization network problems.
{| width="40%" align="right" cellpadding="10"|- valign="top"|{{Admon/notesnote|About KVMThere are actually several key programs installed for virtualization using KVM:<ul><li>'''kvm/qemu''' - the hypervisor and other hardware emulation systems.</li><li>A system service named '''libvirtd''' that manages the VMs.</li><li>A graphical tool for managing virtual machines ('''virt-manager''') and the '''virsh''' command-line tool.</li></ul>}}|}
<ol><li value="6">Start the virtualization service: <b><code><span style="color:#3366CC;font-size:1.2em;">systemctl start libvirtd</span></code></b><br><br><br>'''NOTE:''' The most recent variants of Centos and Fedora are using a service called '''firewalld''' that is intended to replace '''iptables''', however the ''iptables'' service is still in relatively common usage. In this course we will concentrate on ''iptables''.<br><br></li>
