Linux & Unix Virtualization Guides

Linux and Unix Virtualization tutorials for creating a virtual machines (VMS), installing guest operating system (OS), storage device, and computer network resources. The main focus is on KVM, Vmware, LXC, FreeBSD Jails, Xen and related technologies ( rss).

The virtual network (virbr0) used for Network address translation (NAT) which allows guests to access to network services. However, NAT slows down things and only recommended for desktop installations. To disable Network address translation (NAT) forwarding type the following commands:


KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions Intel VT or AMD-V. How do I install KVM under CentOS or Red Hat Enterprise Linux version 5.5?

This FAQ entry is part 1 of 7 in the series Redhat KVM Virtulization:


I‘m using KVM to run multiple virtual machines under Redhat Enterprise Linux server 5.5. I’ve installed FreeBSD 7.x 64 bit as guest operating systems. How do I redirect the FreeBSD version 6, 7 or 8 virtual machine console to a serial port using virsh console command for management purpose from host itself?


How do I find out if my system support Intel – VT / AMD -V hardware virtualization extensions for host CPU using the command line options?


The virsh command can be used to mange local or remote guest operating systems. The program can be used to create, pause, and shutdown domains. It can also be used to list current domains.


virt-manager requires GUI locally and it is slow. On other hand virt-install is a command line tool for provisioning new virtual machines using the “libvirt” hypervisor management library. The tool supports both text based & graphical installations, using serial console, SDL graphics or a VNC client/server pair. The guest can be configured to use one or more virtual disks, network interfaces, audio devices, and physical host devices (USB, PCI). You can use the virt-install to create virtualized guests as follows to install FreeBSD or CentOS.

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There are various log files stored on the host system to assist with debugging KVM related problems. In this tutorial, I will cover log file locations and tools used to track down KVM problems.