1. Check QEMU version
[root@pqsfc018 ~]# /usr/bin/qemu-system-x86_64 -version
QEMU emulator version 1.6.0, Copyright (c) 2003-2008 Fabrice Bellard
2. Check if the KVM modules are loaded
[root@pqsfc018 ~]# lsmod | grep kvm kvm_intel
134476 10 kvm
418302 1 kvm_intel
If not, run commands below to load
#modprobe kvm
#modprobe kvm_intel
3. Configure storage for kvm guest
#qemu-img create -f raw /var/lib/libvirt/images/pqsfc083.img 16G
4. Configure network for kvm guest
4.1 Use network instead of NetworkManager to control networks
#chkconfig NetworkManager off
#chkconfig --levels 35 network on
#service NetworkManager stop
4.2. Create net bridge on host new a ifconfig file named ifcfg-br0
#vi /etc/sysconfig/network-scripts/ifcfg-br0
DEVICE=br0
ONBOOT=yes
BOOTPROTO=static
IPADDR=15.xx.xx.xx
NETMASK=255.255.248.0
GATEWAY=15.xx.xx.xx
TYPE=Bridge
Add one line:
BRIDGE=br0
to ifconfig file ifcfg-eth0
[root@pqsfc070 network-scripts]# cat ifcfg-eth0
DEVICE=eth0
ONBOOT=yes
HWADDR=00:1A:4B:A5:69:B4
TYPE=Ethernet
BOOTPROTO=static
IPADDR=15.xx.xx.xx
NETMASK=255.255.248.0
BRIDGE=br0
#service network restart
4.3 Create a vnic for kvm guest(mapping to br0)
#yum install -y bridge-utils tunctl
#tunctl -u root -b -t vnet12
#ifconfig vnet12 up
#brctl addif br0 vnet12
<command to remove vnic>
#brctl delif br0 vnet12
#ifconfig vnet12 down
#tunctl -d vnet12
5. Create kvm guest by QEMU command
#/usr/bin/qemu-system-x86_64 -name pqsfc085 -enable-kvm -m 2048 -smp 2,sockets=2,cores=1,threads=1 \
-boot order=nc,once=d \
-hda /var/lib/pqsfc085.img \
-cdrom /root/RHEL6.4-20130130.0-Server-x86_64-DVD1.iso \
-net nic,model=virtio,macaddr=00:16:3e:3a:c0:99 \
-net tap,ifname=vnet12,script=no,downscript=no \
-vnc 127.0.0.1:66
Note:
1.-enable-kvm option is must, otherwise the system performance will be poor.
2.-boot order option specify the boot orders. n stands for boot from network, c stands for boot from HDD, d stand for boot from CN-ROM or ISO image
3.specify -net nic and -net tap to use bidege networks, if you don't specify these two options, the guest will use NAT as default.
4.We specify -vnc 127.0.0.1:66 here, you can login host with GUI and connect to guest by VNC viewer or ohter VNC tools
5.Specify a Mac address for the guest. Do not be duplicated to others.
6. Boot guest
#/usr/bin/qemu-system-x86_64 -name pqsfc085 -enable-kvm -m 2048 -smp 8,sockets=8,cores=8,threads=8 \
-hda /var/lib/pqsfc085.img \
-net nic,model=virtio,macaddr=00:16:3e:3a:c0:99 \
-net tap,ifname=vnet12,script=no,downscript=no \
-vnc 127.0.0.1:66