Linux 快速生成虚拟机 shell脚本

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Xuenqlve 2018-01-03 17:11:16 ©著作权

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通过COW写时复制原理实现快速生成虚拟机脚本

#!/bin/bash
#IMG 为镜像文件目录
#YUAN 为模版虚拟机镜像文件
#NAME 为生成虚拟机镜像文件名头
#XML 为xml文件存放位置
#IP 为当前用户的IP 我取来是为了生成mac地址用的
XML=/etc/libvirt/qemu/
IMG=/var/lib/libvirt/images/
YUAN=rh7_template
NAME=test
UUID=`uuidgen`
#IP=`ifconfig | sed -rn "2p" | sed -r 's/(inet)(.*)(netmask)(.*)/\2/'`
IP=`ifconfig |sed -n '2p' | awk '{print $2}'`
#将IP4,IP3设置为mac地址第三四位
#IP4=`echo $IP | sed -r 's/(.*)([0-9]*)[.]([0-9]*$)/\3/'` 这是我没有学awk的时候写的
IP4=`echo $IP | awk  -F. '{print $4}'`
if [ $IP4 -ge 100 ];then
	IP4=$[IP4%100]
elif [ $IP4 -le 9 ];then
	IP4=0$IP4
fi
#IP3=`echo $IP | sed -r 's/(.*)[.]([0-9]*)[.]([0-9]*$)/\2/'`这也是我没有学awk的时候写的
IP3=`echo $IP | awk  -F. '{print $3}'`
if [ $IP3 -ge 100 ];then
	IP3=$[IP3%100]
elif [ $IP3 -le 9 ];then
	IP3=0$IP3
fi

read -p '请输入要创建的数字: ' NUM
if [ -z $NUM ];then
	echo '输入不能为空'
	exit
elif [ -z `echo $NUM | sed 's/[^0-9]*//'` ];then
	echo '请输入数字'
	exit
elif [ $NUM -ge 100 -o $NUM -lt 1 ];then
	echo '请输入在1-100以内的数字' 
	exit
fi

if [ $NUM -le 9 ];then
	NUM=0$NUM
fi
NAME=${NAME}${NUM}
if [ -z $1 ];then
	if [ -e ${IMG}${NAME}.img ];then
		echo '你要创建的号码已经存在'
		exit
	fi
	echo -en "正在创建虚拟机镜像文件和......\t"
	#通过镜像文件，快速生成相应镜像文件
	qemu-img create -f qcow2 -b ${IMG}.${YUAN}.img ${IMG}${NAME}.img &>/dev/null
	echo -e "\e[32;1m[OK]\e[0m"
	echo -en "正在生成XML配置文件......\t"
	#MYXML 为生成的xml配置文件目录
	MYXML=${XML}${NAME}.xml
	cp $IMG.rhel7.xml ${MYXML}
	#使用sed对镜像文件进行修改
	sed -i "/<name>${YUAN}/s/${YUAN}/${NAME}/" ${MYXML}
	sed -i "/<uuid>/s/<uuid>.*</<uuid>$UUID</" ${MYXML}
	sed -i "/${YUAN}\.img/s/${YUAN}/${NAME}/" ${MYXML}
	for i in {a..d}
	do
		sed -i "/mac/s/${i}1/${IP3}/" ${MYXML}
		sed -i "/mac/s/${i}2/${IP4}/" ${MYXML}
		sed -i "/mac/s/${i}3/${NUM}/" ${MYXML}	
	done 
	echo -e "\e[32;1m[OK]\e[0m"
	echo -en "正在生成虚拟机......\t\t" 
	#通过XML文件生成虚拟机
	virsh define ${MYXML} &> /dev/null
	if [ $? -eq 0 ];then
		echo -e "\e[32;1m[OK]\e[0m"
	else
		rm -rf ${MYXML}
		rm -rf ${IMG}${NAME}.img
		echo -e "\e[31;1m[Failed]\e[0m"
	fi
#-d将用次方法生成的虚拟机删除 当时是为了测试方便写的
elif [ $1 == "-d" ];then
	rm -rf ${MYXML}	
	rm -rf ${IMG}${NAME}.img
	virsh undefine ${NAME} &> /dev/null 
	echo "成功删除${NAME}虚拟机"
fi

这里我会提供模版XML 文件模版虚拟机镜像文件使用KVM生成一个新的rhel7虚拟机做为原始盘可以参考 (http://blog.51cto.com/13558754/2057088)

XML 模版

<domain type='kvm'>
	<name>rh7_template</name>
	<uuid>e783146f-d26f-448d-951f-5c739b136d2f</uuid>
	<memory unit='KiB'>1048576</memory>
	<currentMemory unit='KiB'>1048576</currentMemory>
	<vcpu placement='static'>1</vcpu>
	<os>
		<type arch='x86_64' machine='pc-i440fx-rhel7.0.0'>hvm</type>
	</os>
	<features>
		<acpi/>
		<apic/>
	</features>
		<cpu mode='host-model'>
			<model fallback='allow'/>
	</cpu>
	<clock offset='utc'>
		<timer name='rtc' tickpolicy='catchup'/>
		<timer name='pit' tickpolicy='delay'/>
		<timer name='hpet' present='no'/>
	</clock>
	<on_poweroff>destroy</on_poweroff>
	<on_reboot>restart</on_reboot>
	<on_crash>restart</on_crash>
	<pm>
		<suspend-to-mem enabled='no'/>
		<suspend-to-disk enabled='no'/>
	</pm>
	<devices>
		<emulator>/usr/libexec/qemu-kvm</emulator>
		<disk type='file' device='disk'>
			<driver name='qemu' type='qcow2'/>
			<source file='/var/lib/libvirt/images/rh7_template.img'/>
			<target dev='vda' bus='virtio'/>
			<boot order='1'/>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
		</disk>
		<disk type='file' device='cdrom'>
			<driver name='qemu' type='raw'/>
			<target dev='hda' bus='ide'/>
			<readonly/>
			<address type='drive' controller='0' bus='0' target='0' unit='0'/>
		</disk>
		<controller type='usb' index='0' model='ich9-ehci1'>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x7'/>
		</controller>
		<controller type='usb' index='0' model='ich9-uhci1'>
			<master startport='0'/>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0' multifunction='on'/>
		</controller>
		<controller type='usb' index='0' model='ich9-uhci2'>
			<master startport='2'/>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x1'/>
		</controller>
		<controller type='usb' index='0' model='ich9-uhci3'>
			<master startport='4'/>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x2'/>
		</controller>
		<controller type='pci' index='0' model='pci-root'/>
		<controller type='ide' index='0'>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
		</controller>
		<controller type='virtio-serial' index='0'>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
		</controller>
		<interface type='network'>
			<mac address='74:52:a1:a2:a3:01'/>
			<source network='private1'/>
			<model type='virtio'/>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
		</interface>
		<interface type='network'>
			<mac address='74:52:b1:b2:b3:02'/>
			<source network='private2'/>
			<model type='virtio'/>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
		</interface>
		<interface type='network'>
			<mac address='74:52:c1:c2:c3:03'/>
			<source network='public1'/>
			<model type='virtio'/>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x0a' function='0x0'/>
		</interface>
		<interface type='network'>
			<mac address='74:52:d1:d2:d3:04'/>
			<source network='public2'/>
			<model type='virtio'/>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x0b' function='0x0'/>
		</interface>
		<serial type='pty'>
			<target port='0'/>
		</serial>
		<console type='pty'>
			<target type='serial' port='0'/>
		</console>
		<input type='tablet' bus='usb'/>
		<input type='mouse' bus='ps2'/>
		<input type='keyboard' bus='ps2'/>
		<graphics type='spice' autoport='yes'>
			<image compression='off'/>
		</graphics>
		<sound model='ich6'>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
		</sound>
		<video>
			<model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'/>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
		</video>
		<redirdev bus='usb' type='spicevmc'>
		</redirdev>
		<redirdev bus='usb' type='spicevmc'>
		</redirdev>
		<memballoon model='virtio'>
			<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
		</memballoon>
	</devices>
</domain>