Quick copy & paste how-to: Install KVM on CentOS 6

CentOS 6.7 64bit
ISO: ftp://ftp.hosteurope.de/mirror/centos.org/6.7/isos/x86_64/CentOS-6.7-x86_64-netinstall.iso

URL for netinstall: ftp://ftp.hosteurope.de/mirror/centos.org/6.7/os/x86_64

LVM vg: 100%

Host: lv_root / 200 GB

vi /etc/sysconfig/selinux
SELINUX=disabled

yum install wget screen lynx vim kvm libvirt python-virtinst qemu-kvm ncftp tigervnc tigervnc-server system-config-firewall-tui xterm twm bridge-utils virt-manager openssh-askpass openssh-clients dbus-python dbus

yum groupinstall Desktop

yum update

/etc/init.d/messagebus start

system-config-firewall-tui
-> disable firewall

vi /etc/sysconfig/vncservers
VNCSERVERS=”10:root”
VNCSERVERARGS[10]=”-geometry 1024×768″

vi /etc/ssh/sshd_config
Port 450
PermitRootLogin without-password

adduser admin
passwd admin

chkconfig rpcidmapd off
chkconfig rpcgssd off
chkconfig nfslock off
chkconfig netfs off
chkconfig rpcbind off
chkconfig dnsmasq off
chkconfig NetworkManager off
chkconfig messagebus off

vncpasswd

vi /root/.vnc/xstartup

#!/bin/sh
[ -r /etc/sysconfig/i18n ] && . /etc/sysconfig/i18n
export LANG
export SYSFONT
vncconfig -iconic &
unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
OS=`uname -s`
if [ $OS = ‘Linux’ ]; then
case “$WINDOWMANAGER” in
*gnome*)
if [ -e /etc/SuSE-release ]; then
PATH=$PATH:/opt/gnome/bin
export PATH
fi
;;
esac
fi
if [ -x /etc/X11/xinit/xinitrc ]; then
exec /etc/X11/xinit/xinitrc
fi
if [ -f /etc/X11/xinit/xinitrc ]; then
exec sh /etc/X11/xinit/xinitrc
fi
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
xterm -geometry 80×24+10+10 -ls -title “$VNCDESKTOP Desktop” &
twm &

chmod 755 /root/.vnc/xstartup

vi /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
# BROADCAST=x.x.x.x
# DNS1=x.x.x.x
# GATEWAY=x.x.x.x
HWADDR=00:25:90:38:66:c6
# IPADDR=x.x.x.x
# NETMASK=x.x.x.x
NM_CONTROLLED=yes
ONBOOT=yes
TYPE=Ethernet
# DNS2=x.x.x.x
IPV6INIT=no
USERCTL=no
BRIDGE=br0

vi /etc/sysconfig/network-scripts/ifcfg-br0
DEVICE=br0
TYPE=Bridge
BOOTPROTO=none
ONBOOT=yes
DELAY=0
NM_CONTROLLED=no
BROADCAST=x.x.x.x
DNS1=x.x.x.x
GATEWAY=x.x.x.x
IPADDR=x.x.x.x
NETMASK=x.x.x.x
DNS2=x.x.x.x
IPV6INIT=no
USERCTL=no

vi /etc/sysctl.conf
net.ipv4.ip_forward = 1
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1

In /etc/postfix/main.cf:
inet_protocols = ipv4

reboot

Add hostname to /etc/hosts

/etc/init.d/vncserver start


VNC connect to host:10

virt-manager:

localhost ->

1. Virtual Networks -> default -> Basic details: device: (or virbr0), Autostart: unchecked -> Apply

2. Storage -> + (add) -> logical, Name “vm-lvm” -> Build Pool: unchecked -> Source Name: name of existing LVM volume group -> Finish

Done!