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virt-install是一个使用libvirt库构建新虚拟机的命令行工具，此工具使用串行控制台，SDL（Simple DirectMedia Layer）图形或者VNC客户端/服务器，来支持命令行和图形安装。
# apt-get install virtinst Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: adwaita-icon-theme at-spi2-core colord colord-data dconf-gsettings-backend dconf-service fontconfig fontconfig-config fonts-dejavu-core glib-networking glib-networking-common glib-networking-services gsettings-desktop-schemas hicolor-icon-theme ... libxinerama1 libxkbcommon0 libxpm4 libxrandr2 libxrender1 libxtst6 python-libxml2 python-pycurl python-urlgrabber ubuntu-mono virt-viewer x11-common Suggested packages: colord-sensor-argyll cups-common libgd-tools gphoto2 gvfs liblcms2-utils librsvg2-bin avahi-daemon hplip libsane-extras sane-utils python-pycurl-dbg python-pycurl-doc ...
Use the virt-installtool to boot the virtual machine through libvirt and connect to the graphical console from a VNC client installed on your local machine.
# virsh net-list Name State Autostart Persistent ---------------------------------------------------------- default active yes yesIf the network is not active, start it by doing:
查看default网络的配置
root@zhaicompute# brctl show
bridge name bridge id STP enabled interfaces
virbr0 8000.5254000f5c96 yes virbr0-nic
root@zhaicompute# ifconfig virbr0
virbr0 Link encap:Ethernet HWaddr 52:54:00:0f:5c:96
inet addr:192.168.22.1 Bcast:192.168.22.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
root@zhaicompute# cat /etc/libvirt/qemu/networks/default.xml
<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
virsh net-edit default
or other application using the libvirt API.
-->
<network>
<name>default</name>
<uuid>6acb-ed0a-4ad1-b8dc-527168a2</uuid>
<forward mode='nat'/>
<bridge name='virbr0' stp='on' delay='0'/>
<mac address='52:33:00:0f:5c:96'/>
<ip address='192.168.22.1' netmask='255.255.255.0'>
<dhcp>
<range start='192.168.22.2' end='192.168.22.254'/>
</dhcp>
</ip>
</network>default网络设置保存在/etc/libvirt/qemu/networks目录下，从配置中可看出具体的网桥virbr0.qemu-img command to create an empty image file
root@zhaicompute# qemu-img create -f qcow2 zhai-ubuntu14.04.4.qcow2 10G
Formatting 'zhai-ubuntu14.04.4.qcow2', fmt=qcow2 size=10737418240 encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16
root@zhaicompute# ls
ubuntu-14.04.3-server-ppc64el.iso zhai-ubuntu14.04.4.qcow2
root@zhaicompute# qemu-img info zhai-ubuntu14.04.4.qcow2
image: zhai-ubuntu14.04.4.qcow2
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 196K
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
refcount bits: 16
corrupt: false
virt-install command to start up a virtual machine using that image file.
命令行：
virt-install --virt-type kvm --name zhai-ubuntu --ram 1024 > --cdrom=/var/lib/libvirt/images/zhaipool/ubuntu-14.04.4-server-ppc64el.iso > --disk /var/lib/libvirt/images/zhaipool/zhai-ubuntu14.04.4.qcow2,format=qcow2 > --network network=default > --graphics vnc,listen=0.0.0.0 --noautoconsole > --os-type=linux --os-variant=ubuntutrusty
root@zhaicompute# virt-install --os-variant list win2k8 : Microsoft Windows Server 2008 (or later) win2k3 : Microsoft Windows Server 2003 win7 : Microsoft Windows 7 (or later) vista : Microsoft Windows Vista winxp64 : Microsoft Windows XP (x86_64) winxp : Microsoft Windows XP win2k : Microsoft Windows 2000 openbsd4 : OpenBSD 4.x (or later) freebsd9 : FreeBSD 9.x freebsd8 : FreeBSD 8.x freebsd7 : FreeBSD 7.x freebsd6 : FreeBSD 6.x freebsd10 : FreeBSD 10.x (or later) solaris9 : Sun Solaris 9 solaris11 : Sun Solaris 11 (or later) solaris10 : Sun Solaris 10 opensolaris : Sun OpenSolaris (or later) netware6 : Novell Netware 6 (or later) netware5 : Novell Netware 5 netware4 : Novell Netware 4 msdos : MS-DOS generic : Generic altlinux : ALT Linux (or later) debianwheezy : Debian Wheezy (or later) debiansqueeze : Debian Squeeze debianlenny : Debian Lenny debianetch : Debian Etch fedora20 : Fedora 20 (or later) fedora19 : Fedora 19 fedora18 : Fedora 18 fedora17 : Fedora 17 fedora16 : Fedora 16 fedora15 : Fedora 15 fedora14 : Fedora 14 fedora13 : Fedora 13 fedora12 : Fedora 12 fedora11 : Fedora 11 fedora10 : Fedora 10 fedora9 : Fedora 9 fedora8 : Fedora 8 fedora7 : Fedora 7 fedora6 : Fedora Core 6 fedora5 : Fedora Core 5 mes5.1 : Mandriva Enterprise Server 5.1 (or later) mes5 : Mandriva Enterprise Server 5.0 mandriva2010 : Mandriva Linux 2010 (or later) mandriva2009 : Mandriva Linux 2009 and earlier mageia1 : Mageia 1 (or later) rhel7 : Red Hat Enterprise Linux 7 (or later) rhel6 : Red Hat Enterprise Linux 6 rhel5.4 : Red Hat Enterprise Linux 5.4 or later rhel5 : Red Hat Enterprise Linux 5 rhel4 : Red Hat Enterprise Linux 4 rhel3 : Red Hat Enterprise Linux 3 rhel2.1 : Red Hat Enterprise Linux 2.1 sles11 : Suse Linux Enterprise Server 11 (or later) sles10 : Suse Linux Enterprise Server opensuse12 : openSuse 12 (or later) opensuse11 : openSuse 11 ubuntuutopic : Ubuntu 14.10 (Utopic Unicorn) (or later) ubuntutrusty : Ubuntu 14.04 LTS (Trusty Tahr) ubuntusaucy : Ubuntu 13.10 (Saucy Salamander) ubunturaring : Ubuntu 13.04 (Raring Ringtail) ubuntuquantal : Ubuntu 12.10 (Quantal Quetzal) ubuntuprecise : Ubuntu 12.04 LTS (Precise Pangolin) ubuntuoneiric : Ubuntu 11.10 (Oneiric Ocelot) ubuntunatty : Ubuntu 11.04 (Natty Narwhal) ubuntumaverick : Ubuntu 10.10 (Maverick Meerkat) ubuntulucid : Ubuntu 10.04 LTS (Lucid Lynx) ubuntukarmic : Ubuntu 9.10 (Karmic Koala) ubuntujaunty : Ubuntu 9.04 (Jaunty Jackalope) ubuntuintrepid : Ubuntu 8.10 (Intrepid Ibex) ubuntuhardy : Ubuntu 8.04 LTS (Hardy Heron) mbs1 : Mandriva Business Server 1 (or later) virtio26 : Generic 2.6.25 or later kernel with virtio generic26 : Generic 2.6.x kernel generic24 : Generic 2.4.x kernel
root@zhaicompute# virt-install --virt-type kvm --name zhai-ubuntu --ram 1024 > --cdrom=/var/lib/libvirt/images/zhaipool/ubuntu-14.04.4-server-ppc64el.iso > --disk /var/lib/libvirt/images/zhaipool/zhai-ubuntu14.04.4.qcow2,format=qcow2 > --network network=default > --graphics vnc,listen=0.0.0.0 --noautoconsole > --os-type=linux --os-variant=ubuntutrusty Starting install... Creating domain... | 0 B 00:00 Domain installation still in progress. You can reconnect to the console to complete the installation process. root@zhaicompute# ps -ef | grep zhai libvirt+ 27531 1 99 03:39 ? 00:00:22 qemu-system-ppc64 -enable-kvm -name zhai-ubuntu -S -machine pseries-2.3,accel=kvm,usb=off -m 1024 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid de480a35-4ab5-42e5-b3b6-a47c8b05d9c8 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/zhai-ubuntu.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-reboot -boot strict=on -device pci-ohci,id=usb,bus=pci.0,addr=0x2 -device spapr-vscsi,id=scsi0,reg=0x2000 -drive file=/var/lib/libvirt/images/zhaipool/zhai-ubuntu14.04.4.qcow2,if=none,id=drive-scsi0-0-0-0,format=qcow2 -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=2 -drive file=/var/lib/libvirt/images/zhaipool/ubuntu-14.04.4-server-ppc64el.iso,if=none,id=drive-scsi0-0-0-1,readonly=on,format=raw -device scsi-cd,bus=scsi0.0,channel=0,scsi-id=0,lun=1,drive=drive-scsi0-0-0-1,id=scsi0-0-0-1,bootindex=1 -netdev tap,fd=29,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:cb:ad:fa,bus=pci.0,addr=0x1 -chardev pty,id=charserial0 -device spapr-vty,chardev=charserial0,reg=0x30000000 -device usb-kbd,id=input0 -device usb-mouse,id=input1 -vnc 0.0.0.0:2 -device VGA,id=video0,vgamem_mb=16,bus=pci.0,addr=0x4 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 -msg timestamp=on root 27540 23850 0 03:40 pts/8 00:00:00 grep --color=auto zhai从上看出：virt-install执行后，最终调用的是qemu-system-ppc64命令来创建vm。
一个虚拟机占用一个进程，可以通过进程管理和控制虚拟机。
log日志：
root@zhaicompute# ls /var/log/libvirt/qemu/ zhai-ubuntu.log
创建后，查看网络：
root@zhaicompute# brctl show
bridge name bridge id STP enabled interfaces
virbr0 8000.5254000f5c96 yes virbr0-nic
vnet0可看出virbr0上多了一下端口vnet0.virbr0 Link encap:Ethernet HWaddr 52:54:00:0f:5c:96
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:10646 errors:0 dropped:0 overruns:0 frame:0
TX packets:14645 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:617571 (617.5 KB) TX bytes:20396983 (20.3 MB)
virbr0-nic Link encap:Ethernet HWaddr 52:54:00:0f:5c:96
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
vnet0 Link encap:Ethernet HWaddr fe:54:00:7e:60:d0
inet6 addr: fe80::fc54:ff:fe7e:60d0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:10646 errors:0 dropped:0 overruns:0 frame:0
TX packets:17480 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:766615 (766.6 KB) TX bytes:20544635 (20.5 MB)查看生成的xml配置文件 ：
# ls -lrt /etc/libvirt/qemu -rw------- 1 root root 2511 Apr 15 11:25 zhai-ubuntu.xml
zhai-ubuntu.xml内容：
# cat /etc/libvirt/qemu/zhai-ubuntu.xml
<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
virsh edit zhai-ubuntu
or other application using the libvirt API.
-->
<domain type='kvm'>
<name>zhai-ubuntu</name>
<uuid>0e5684f5-23aa-8568-ed10-52c844b4d85d</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>2</vcpu>
<os>
<type arch='ppc64le' machine='pseries-2.3'>hvm</type>
<boot dev='cdrom'/>
<boot dev='hd'/>
<bootmenu enable='yes'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/bin/kvm</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source file='/var/lib/libvirt/images/zhaipool/zhai-ubuntu14.04.4.qcow2'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'/>
<source file='/var/lib/libvirt/images/zhaipool/ubuntu-14.04.4-server-ppc64el.iso'/>
<target dev='sda' bus='usb'/>
</disk>
<controller type='usb' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<interface type='network'>
<mac address='52:54:00:7e:60:d0'/>
<source network='default'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
</interface>
<serial type='pty'>
<target port='0'/>
<address type='spapr-vio' reg='0x30000000'/>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
<address type='spapr-vio' reg='0x30000000'/>
</console>
<input type='tablet' bus='usb'/>
<input type='keyboard' bus='usb'/>
<input type='mouse' bus='usb'/>
<graphics type='vnc' port='-1' autoport='yes'/>
<video>
<model type='vga' vram='16384' heads='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</video>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</memballoon>
</devices>
</domain>
基于KVM建立的虚拟机相关文件默认存放位置
kvm虚拟机配置文件位置/etc/libvirt/qemu/ <---都是xml文件
kvm虚拟机文件位置：/var/lib/libvirt/images/ <---可以在建立虚拟机时指定
建立的虚拟机在运行时相关文件及存放位置
在虚拟机运行时，会在/var/run/libvirt/qemu目录下存放虚拟机的pid文件和配置文件，配置文件与/etc/libvirt/qemu目录下对应的虚拟机文件相同，pid文件保存有此虚拟机进程号。虚拟机的日志文件存放在/var/log/libvirt/qemu目录下，每个虚拟机一个，文件名称为：虚拟机名称(或UUID)+“.log”
Use the virsh vncdisplay vm-name command to get the VNC port number.
root@zhaicompute# virsh vncdisplay zhai-ubuntu :2 root@zhaicompute# ps -ef | grep vnc libvirt+ 27531 1 99 03:39 ? 00:09:35 qemu-system-ppc64 -enable-kvm -name zhai-ubuntu -S -machine pseries-2.3,accel=kvm,usb=off -m 1024 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid de480a35-4ab5-42e5-b3b6-a47c8b05d9c8 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/zhai-ubuntu.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-reboot -boot strict=on -device pci-ohci,id=usb,bus=pci.0,addr=0x2 -device spapr-vscsi,id=scsi0,reg=0x2000 -drive file=/var/lib/libvirt/images/zhaipool/zhai-ubuntu14.04.4.qcow2,if=none,id=drive-scsi0-0-0-0,format=qcow2 -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=2 -drive file=/var/lib/libvirt/images/zhaipool/ubuntu-14.04.4-server-ppc64el.iso,if=none,id=drive-scsi0-0-0-1,readonly=on,format=raw -device scsi-cd,bus=scsi0.0,channel=0,scsi-id=0,lun=1,drive=drive-scsi0-0-0-1,id=scsi0-0-0-1,bootindex=1 -netdev tap,fd=29,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:cb:ad:fa,bus=pci.0,addr=0x1 -chardev pty,id=charserial0 -device spapr-vty,chardev=charserial0,reg=0x30000000 -device usb-kbd,id=input0 -device usb-mouse,id=input1 -vnc 0.0.0.0:2 -device VGA,id=video0,vgamem_mb=16,bus=pci.0,addr=0x4 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 -msg timestamp=on
qemu不使用linux下的vncserver提供vnc服务，因此在此服务没有启动的情况下，也能通过vnc客户端连接到虚拟机。
安装完成后，登录虚机，查看IP
给guest主机划分物理机分区
lvcreate -L20G -n host.demo.com kvm-storage
下载镜像并loop到本地：
wget http://mirrors.manchester.icecolo.com/centos/5.5/isos/x86_64/CentOS-5.5-x86_64-bin-1of8.iso
mkdir /mnt/centos55
mount -o loop CentOS-5.5-x86_64-bin-1of8.iso /mnt/centos55/
通过location本地安装，并通过console管理：
virt-install
-n host.demo.com
-r 512
--vcpus=1
--os-variant=rhel5.4
--accelerate
--nographics
-v
-l /mnt/centos55/
-w bridge:br1
--disk path=/dev/kvm-storage/host.demo.com
-x "console=ttyS0"
管理时可以通过
#查看guest id、name 及状态
virsh list --all
#通过console连接查看
virsh console id或name
#连接完成后会要求输入用户名和密码
参考：
1 virt-install 使用说明: http://blog.csdn.net/starshine/article/details/6998189
2 kvm, qemu-kvm以及libvirt之间的关系图：http://blog.csdn.net/zhaihaifei/article/details/51018113
3 kvm虚拟化之virt-install: http://www.361way.com/virt-install/2721.html
4 kvm显示VM的IP:http://www.chengxuyuans.com/Unix/83251.html
5 virbr0: http://blog.chinaunix.net/uid-26000137-id-3723948.html
使用virt-install手动创建qcow2镜像并安装ISO
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原文地址：http://blog.csdn.net/zhaihaifei/article/details/51153402
