（1） 查看正在运行的虚拟机
root@kvm:~# virsh list
Id Name State
----------------------------------------------------
11 kvm1 running
（2）把配置文件输出到标准输出
root@kvm:~# virsh dumpxml kvm1
<domain type='kvm' id='11'>
<name>kvm1</name>
<uuid>9eb9a2e9-abb2-54c5-5cb3-dc86728e70fc</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64' machine='pc-i440fx-trusty'>hvm</type>
<boot dev='hd'/>
</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/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/tmp/debian.img'/>
<target dev='hda' bus='ide'/>
<alias name='ide0-0-0'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='usb' index='0'>
<alias name='usb0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'>
<alias name='pci.0'/>
</controller>
<controller type='ide' index='0'>
<alias name='ide0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<interface type='network'>
<mac address='52:54:00:d1:70:df'/>
<source network='default'/>
<target dev='vnet0'/>
<model type='rtl8139'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<source path='/dev/pts/0'/>
<target port='0'/>
<alias name='serial0'/>
</serial>
<console type='pty' tty='/dev/pts/0'>
<source path='/dev/pts/0'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='vnc' port='5900' autoport='yes' listen='146.20.141.158'>
<listen type='address' address='146.20.141.158'/>
</graphics>
<video>
<model type='cirrus' vram='9216' heads='1'/>
<alias name='video0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<alias name='balloon0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</memballoon>
</devices>
<seclabel type='none'/>
</domain>
（3）保存配置到新的文件
root@kvm:~# virsh dumpxml kvm1 > kvm1.xml
root@kvm:~# head kvm1.xml
<domain type='kvm' id='11'>
<name>kvm1</name>
<uuid>9eb9a2e9-abb2-54c5-5cb3-dc86728e70fc</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
（4）编辑配置文件
root@kvm:~# virsh edit kvm1
Domain kvm1 XML configuration edited.
二. virt-install安装kvm且使用console方式
去构建KVM实例并用console口连接它，执行以下步骤：
（1）使用官方Debian库安装KVM虚拟机
root@kvm:~# virt-install --name kvm1 --ram 1024 --extra-args="text console=tty0 utf8 console=ttyS0,115200" --graphics vnc,listen=146.20.141.158 --hvm --location=http://ftp.us.debian.org/debian/dists/stable/main/installer-amd64/ --disk path=/tmp/kvm1.img,size=8
Retrieving file MANIFEST... | 3.3 kB 00:00 ...
Retrieving file linux... | 6.0 MB 00:00 ...
Retrieving file initrd.gz... | 29 MB 00:00 ...
Creating storage file kvm1.img | 8.0 GB 00:00
WARNING Unable to connect to graphical console: virt-viewer not installed. Please install the 'virt-viewer' package.
Domain installation still in progress. You can reconnect to
the console to complete the installation process.
（2）运行以下的代码去和console口关联
root@kvm:~# virsh console kvm1
Connected to domain kvm1
Escape character is ^]
（3）关联上console口后，应该看到如下画面。
（4）根据提示的菜单栏完成安装
（5）然后启动虚拟机
root@kvm:~# virsh start kvm1
Domain kvm1 started
（6）使用vnc连接然后开启Serial 控制台访问
root@debian:~# systemctl enable serial-getty@ttyS0.service
root@debian:~# systemctl start serial-getty@ttyS0.service
（7）关闭vnc的连接，然后使用virsh console去连接它。
root@kvm:~# virsh console kvm1
Connected to domain kvm1
Escape character is ^]
Debian GNU/Linux 8 debian ttyS0
debian login: root
Password:
Last login: Wed Mar 22 16:38:10 CDT 2017 on tty1
Linux debian 3.16.0-4-amd64 #1 SMP Debian 3.16.39-1+deb8u2 (2017-03-07) x86_64
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
root@debian:~# free -m
total used free shared buffers cached
Mem: 1000 98 902 4 9 43
-/+ buffers/cache: 44 956
Swap: 382 0 382
