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How do I setup and manage a virtualized environment with Kernel based Virtual Machine (KVM) in CentOS or Red Hat Enterpise Linux version 6 server on IBM server? Can you provide step-by-step commands of how to install and manage Virtual Machines (VMs) on a physical server using KVM for RHEL/CentOS version 6.4?

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I am a new CentOS Linux user and installed it on HP server. I updated /etc/sysconfig/iptables firewall config file. How do I restart a firewall on CentOS Linux version 5/6? How can I use command line to restart iptables on a CentOS server?

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