KVM指令碼大量新增刪除虛擬機器

[背景]最近事情特別多，前段時間搞搞openstack，發現過與複雜，就想把KVM先好好學學，再過來搞它．因為工作關係，又用twisted開發了一個c/s的監控程式，但因還沒有寫完，所以暫時沒有發出來．如果不是強逼自己，我想我這個工具，也可能需要再等幾日才能發布吧．扯遠了，先不說這些，就說我這款工具能幹嘛吧．簡單的說就像openstack的鏡像功能一般，不過，人家是提供Web Gui，點兩下就OK了，我這需要修改下設定檔vm.ini，不過它那個點兩下，不一定OK噢，反正我試過，沒那麼靈光．我的設定檔很簡單，就是告訴我是添加還是刪除虛擬機器，如果添加則需要告訴模板鏡像檔案在哪？模板xml檔案在哪．當然這些都是要定義好的．也就是提前將鏡像檔案做好嘛．openstack的glance也是需要的嘛．

[過程]

(1)安裝模板系統

略

(2)將模板img檔案和xml檔案分別copy到/template/img,/template/xml下，當然，你也可以更改，不過，程式也需要做修改.

(3)修改vm.ini檔案

參考

模板xml檔案

more /template/xml/Template_Centos55x64_LAMP.xml

<!--WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BEOVERWRITTEN AND LOST. Changes to this xml configuration should be made using:  virsh edit Template_Centos55x64_LAMPor 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

現在我來做一個工作，就是添加兩個虛擬機器，一個叫web01,一個叫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

執行指令碼，結果:

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650) this.width=650;" src="http://www.bkjia.com/uploads/allimg/131227/1Q6413351-1.jpg" style="float:none;" title="result2.jpg" />

[提供代碼]

#!/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 moduleimport shutilimport os,sysfrom virtinst.util import *import libvirtimport reif sys.version_info < (2,5):        import lxml.etree as ETelse:        import xml.etree.ElementTree as ET#Define variablestemplate_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 1    else:        return 0def copy_vm_img_file(src_img_file,dst_img_file):    print "Start Copy",src_img_file,"to",dst_img_file    if file_exists(dst_img_file):        print "File %s exists, abort" % dst_img_file        sys.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 = True    if 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 e    try:        conn.close()    except:        print "Faild to close the connection!"        sys.exit(1)    print "Done!"    print "="*100def 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_file    vm_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_file        sys.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 VM    print "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 e        sys.exit(1)    if server.isActive():        print "VM %s will be shutdown!" %vm_name        try:            #server.shutdown()#VM need install acpid            server.destroy()        except Exception,e:            print e            sys.exit(1)        print "VM %s will be delete!" %vm_name        try:            server.undefine()        except Exception,e:            print e            sys.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_name        try:            server.undefine()        except Exception,e:            print e            sys.exit(1)                                              delete_file(img_file)        delete_file(xml_file)    print "Done"    print "="*100#Open config filefh=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 file        print "Copy Template VM image file"        copy_vm_img_file(src_img_file,dst_img_file)        #Function1.2 Create VM XML file        print "Create VM Xml file"        create_vm_xml_file(src_xml_file,vm_name,dst_img_file)    elif action=="delete":        #Function3 Delete VM        print "Delete VM"        delete_vm(vm_name)

後期，將提供通過指令碼修改些虛擬機器設定的指令碼．先寫這些吧．

本文出自 “壞男孩” 部落格，請務必保留此出處http://5ydycm.blog.51cto.com/115934/1211630