Qemu&KVM第二篇之（3）使用virsh xml file 创建VM

Before you start a new VM for the first time, you must define it from its xml file (located in the /etc/libvirt/qemu/ directory):

define /etc/libvirt/qemu/vm1.xml

Please note that whenever you modify the VM’s xml file in/etc/libvirt/qemu/, you must run the define command again!在/etc/libvirt/qemu/可以找到已生成好的xml 文件， 在/var/lib/libvirt/images 可以找到 image

s199425@s199425-OptiPlex-780:~/vm$ cat ubuntutest.xml
<domain type='kvm'>
<name>ubuntutest</name>
<uuid>0f0806ab-531d-6134-5def-c5b4955292aa</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>1</vcpu>
<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='qcow2'/>
<source file='/home/s199425/vm/ubuntutest.qcow2'/>
<target dev='vda' bus='virtio'/>
</disk>
<controller type='pci' index='0' model='pci-root'/>
<interface type='bridge'>
<mac address='fa:16:3e:6e:89:ce'/>
<source bridge='br0'/>
<target dev='tap1'/>
<model type='virtio'/>
<alias name='net0'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'>
<listen type='address' address='0.0.0.0'/>
</graphics>
<video>
<model type='cirrus' vram='9216' heads='1'/>
<alias name='video0'/>
</video>
<memballoon model='virtio'>
<alias name='balloon0'/>
</memballoon>
</devices>
</domain>

virsh define *.xml
virsh startConverting from QEMU args to domain XMLhttp://libvirt.org/drvqemu.html

$ cat > demo.args <<EOF
LC_ALL=C PATH=/bin HOME=/home/test USER=test
LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1
-nographic -monitor pty -no-acpi -boot c -hda
/dev/HostVG/QEMUGuest1 -net none -serial none
-parallel none -usb
EOF

$ virsh domxml-from-native qemu-argv demo.args

Converting from domain XML to QEMU args

$ cat > demo.xml <<EOF
<domain type='qemu'>
<name>QEMUGuest1</name>
<uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
<memory>219200</memory>
<currentMemory>219200</currentMemory>
<vcpu>1</vcpu>
<os>
<type arch='i686' machine='pc'>hvm</type>
<boot dev='hd'/>
</os>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu</emulator>
<disk type='block' device='disk'>
<source dev='/dev/HostVG/QEMUGuest1'/>
<target dev='hda' bus='ide'/>
</disk>
</devices>
</domain>
EOF

$ virsh domxml-to-native qemu-argv demo.xml

再测试一次 成功
先拷贝prebuild img ，
创建 xml 文件
然后 virsh create <VM name>
记得要 看看网卡设置

root@ubuntu:/home/s199425/VM# qemu-img convert -O qcow2 -c ubuntu.12-04.x86.20141001.raw.img ubuntu.12-04.x86.20141001.raw.img.qcow2
root@ubuntu:/home/s199425/VM# nano ubunturaw.xml

root@ubuntu:/home/s199425/VM# virsh create ubunturaw.xml
Domain ubuntutraw created from ubunturaw.xml
~~

http://libvirt.org/drvqemu.html

Example domain XML config

QEMU emulated guest on x86_64

<domain type='qemu'>
<name>QEmu-fedora-i686</name>
<uuid>c7a5fdbd-cdaf-9455-926a-d65c16db1809</uuid>

KVM hardware accelerated guest on i686

<domain type='kvm'>
<name>demo2</name>
<uuid>4dea24b3-1d52-d8f3-2516-782e98a23fa0</uuid>