备份一个通过拷贝来创建虚拟机镜像的脚本

最新推荐文章于 2021-04-19 09:13:43 发布

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本文介绍了一个用于克隆指定虚拟机磁盘并更新相应配置文件的shell脚本。该脚本首先获取源逻辑卷大小，创建相同大小的新逻辑卷，并将数据从源逻辑卷复制到新创建的逻辑卷中。随后进行挂载、VG扫描、VG重命名、挂载分区等操作，并更新fstab和网络配置文件。

#!/bin/sh

machine=$1
mac=$2
ip=$3

if [ -z "$machine" ]; then
	echo "usage: sh $0 machine mac ip"
	exit
fi

source_bytes=`fdisk -ucl /dev/vbd/test00|grep test00|grep -Eo "[0-9]+ bytes"|cut -d" " -f1`
source_M=$(($source_bytes/1024/1024))

echo "creating new logic volumn $machine"
lvcreate -L ${source_M}M -n $machine vbd

echo "copy data from lv test00"
dd if=/dev/vbd/test00 of=/dev/vbd/$machine bs=1M count=$source_M

echo "mount new created logic volumn"
kpartx -av /dev/vbd/$machine

echo "scan volumn group"
vgscan

echo "rename volumn group to $machine"
vgrename test00 $machine

echo "load volumn group $machine"
vgchange -ay $machine

echo "mount logic volumn lv_root"
mount /dev/$machine/lv_root /mnt

echo "modify fstab to new volumn group name $machine"
sed -i "s/test00/$machine/g" /mnt/etc/fstab 
sed -i "s/test00/$machine/g" /mnt/etc/sysconfig/network

if [ -n "$mac" ]; then
	sed -i "s/00:16:3E:38:01:E6/$mac/g" /mnt/etc/sysconfig/network-scripts/ifcfg-eth0
fi

if [ -n "$ip" ]; then
	sed -i "s/192.168.1.230/$ip/g" /mnt/etc/sysconfig/network-scripts/ifcfg-eth0
fi

echo "umount lv_root"
umount /mnt

echo "mount first partition of vbd-$machine"
mount /dev/mapper/vbd-${machine}p1 /mnt

echo "change menu.lst to $machine"
sed -i "s/test00/$machine/g" /mnt/grub/menu.lst

echo "umount vbd-$machine"
umount /mnt

echo "disable vg"
vgchange -an $machine

echo "disable $machine"
kpartx -d /dev/vbd/$machine