[背景]最近事情特别多，前段时间搞搞openstack，发现过与复杂，就想把KVM先好好学学，再过来搞它．因为工作关系，又用twisted开发了一个c/s的监控程序，但因还没有写完，所以暂时没有发出来．如果不是强逼自己，我想我这个工具，也可能需要再等几日才能发布吧．扯远了，先不说这些，就说我这款工具能干嘛吧．简单的说就像openstack的镜像功能一般，不过，人家是提供Web Gui，点两下就OK了，我这需要修改下配置文件vm.ini，不过它那个点两下，不一定OK噢，反正我试过，没那么灵光．我的配置文件很简单，就是告诉我是添加还是删除虚拟机，如果添加则需要告诉模板镜像文件在哪？模板xml文件在哪．当然这些都是要定义好的．也就是提前将镜像文件做好嘛．openstack的glance也是需要的嘛．

[过程]

(1)安装模板系统

略

(2)将模板img文件和xml文件分别copy到/template/img,/template/xml下，当然，你也可以更改，不过，程序也需要做修改.

(3)修改vm.ini文件

参考

模板xml文件

more /template/xml/Template_Centos55x64_LAMP.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 Template_Centos55x64_LAMP
or other application using the libvirt API.
-->
<domain type='kvm'><name>Template_Centos55x64_LAMP</name><uuid>e7bbc1b0-e9b1-a0f2-bd1e-dd9f3fd48823</uuid><memory unit='KiB'>524288</memory><currentMemory unit='KiB'>524288</currentMemory><vcpu placement='static'>2</vcpu><os><type arch='x86_64' machine='rhel6.3.0'>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/libexec/qemu-kvm</emulator><disk type='file' device='disk'><driver name='qemu' type='raw'/><source file='/var/lib/libvirt/images/Template_Centos55x64_LAMP.img'/><target dev='hda' bus='ide'/><address type='drive' controller='0' bus='0' target='0' unit='0'/></disk><interface type='bridge'><mac address='52:54:00:88:d0:51'/><source bridge='br0'/><model type='virtio'/></interface><serial type='pty'><target port='0'/></serial><console type='pty'><target type='serial' port='0'/></console><input type='mouse' bus='ps2'/><graphics type='vnc' port='-1' autoport='yes'/><video><model type='cirrus' vram='9216' heads='1'/></video></devices>
</domain>

[root@localhost xml]# more /template/scripts/vm.ini
#Action,Vm_name,Template_img_file,Template_xml_file
add,web01,Template_Centos55x64_LAMP.img,Template_Centos55x64_LAMP.xml

delete,web01,none,none

现在我来做一个工作，就是添加两个虚拟机，一个叫web01,一个叫web02

[root@localhost xml]# more /template/scripts/vm.ini
#Action,Vm_name,Template_img_file,Template_xml_file
add,web01,Template_Centos55x64_LAMP.img,Template_Centos55x64_LAMP.xml

add,web02,Template_Centos55x64_LAMP.img,Template_Centos55x64_LAMP.xml

执行脚本，结果:

[提供代码]

#!/usr/bin/env python
###################################################################
#Auth:Zhuzhengjun
#LastModified:2013/05/27
#Version 0.1
#Function Description:
#Batch automatically generated/delete VM
#1.Generated VM
##1.1.Copy VM img file
##1.2.Create VM XML file
###1.2.1.Update UUID
###1.2.2.Update MAC
###1.2.3.Update img path
###1.2.4.Update VM Name
#2.Start VM
#3.Delete VM
####################################################################
#import module
import shutil
import os,sys
from virtinst.util import *
import libvirt
import re
if sys.version_info < (2,5):import lxml.etree as ET
else:import xml.etree.ElementTree as ET
#Define variables
template_img_path="/template/img"
template_xml_path="/template/xml"
vm_img_path="/var/lib/libvirt/images"
vm_xml_path="/etc/libvirt/qemu"
vm_file="/template/scripts/vm.ini"
uri="qemu:///system"
def file_exists(file):if os.path.exists(file):return 1else:return 0
def copy_vm_img_file(src_img_file,dst_img_file):print "Start Copy",src_img_file,"to",dst_img_fileif file_exists(dst_img_file):print "File %s exists, abort" % dst_img_filesys.exit(1)shutil.copyfile(src_img_file,dst_img_file)print "Done!"
def start_vm(vm_xml_file,vm_name):try: conn = libvirt.open(uri)except Exception,e:print 'Faild to open connection to the hypervisor'sys.exit(1)create = Trueif create:xmlfile=open(vm_xml_file)xmldesc=xmlfile.read()xmlfile.close()try:vmname = conn.defineXML(xmldesc)except Exception,e:print "Failed to define %s:%s" %(vm_name,e)sys.exit(1)if vmname is None:print 'whoops this shouldnt happen!'try:vmname.create()except Exception,e:print "Failed to create %s:%s" %(vm_name,e)sys.exit(1)try:print "Domain 0:id %d running %s" %(vmname.ID(),vmname.name())except Exception,e:print etry:conn.close()except:print "Faild to close the connection!"sys.exit(1)print "Done!"print "="*100
def create_vm_xml_file(src_xml_file,vm_name,dst_img_file):config = ET.parse(src_xml_file)name = config.find('name')name.text = vm_name.strip()uuid = config.find('uuid')uuid.text = uuidToString(randomUUID())mac = config.find('devices/interface/mac')mac.attrib['address'] = randomMAC(type='qemu')disk = config.find('devices/disk/source')disk.attrib['file']=dst_img_filevm_xml_name=vm_name.strip() + '.xml'vm_xml_file=os.path.join(vm_xml_path,vm_xml_name)if file_exists(vm_xml_file):print "File %s exists, abort" % vm_xml_filesys.exit(1)config.write(vm_xml_file)print "Created vm config file %s" % vm_xml_file#print "Use disk image %s, you must create it from the template disk: %s" % (disk_image, disk_old)print "Done!"#Function 2 Start VMprint "Start VM"start_vm(vm_xml_file,vm_name)
def delete_file(file_name):if file_exists(file_name):os.unlink(file_name)
def delete_vm(vm_name):vmimg=vm_name+".img"vmxml=vm_name+".xml"img_file=os.path.join(vm_img_path,vmimg)xml_file=os.path.join(vm_xml_path,vmxml)try:conn = libvirt.open(uri)except Exception,e:print 'Faild to open connection to the hypervisor'sys.exit(1)try:server=conn.lookupByName(vm_name)except Exception,e:print esys.exit(1)if server.isActive():print "VM %s will be shutdown!" %vm_nametry:#server.shutdown()#VM need install acpidserver.destroy()except Exception,e:print esys.exit(1)print "VM %s will be delete!" %vm_nametry:server.undefine()except Exception,e:print esys.exit(1)delete_file(img_file)delete_file(xml_file)try:conn.close()except:print "Faild to close the connection!"sys.exit(1)else:print "VM %s will be delete!" %vm_nametry:server.undefine()except Exception,e:print esys.exit(1)delete_file(img_file)delete_file(xml_file)print "Done"print "="*100
#Open config file
fh=open(vm_file)
vm_config=fh.readlines()
fh.close()
for line in vm_config:passline=re.compile("#.*")if re.search(passline,line)!=None:continue(action,vm_name,src_file,xml_file)=line.strip().split(",")if action=='add':src_img_file=os.path.join(template_img_path,src_file)dst_img_file=os.path.join(vm_img_path,vm_name.strip()+".img")src_xml_file=os.path.join(template_xml_path,xml_file)if not (file_exists(src_img_file) and file_exists(src_xml_file)):print "File %s or %s not exists,abort!" %(src_img_file,src_xml_file)sys.exit(1)#Function1.1 Copy VM img fileprint "Copy Template VM image file"copy_vm_img_file(src_img_file,dst_img_file)#Function1.2 Create VM XML fileprint "Create VM Xml file"create_vm_xml_file(src_xml_file,vm_name,dst_img_file)elif action=="delete":#Function3 Delete VMprint "Delete VM"delete_vm(vm_name)

后期，将提供通过脚本修改些虚拟机配置的脚本．先写这些吧．

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