ubuntu虚拟机上定制文件系统

1. 定制文件系统前期准备

将rootfs.img文件准备好，并创建target文件夹

2. 编写chroot.sh

#!/bin/bash

ARCH=`uname -m`
	if [ $# -eq 0 ]; then
	echo "Usage : $0 <chrootdir>"
	exit
fi

if [ $1 = "mount" ]; then
	sudo mount *.img $2
	if [ "$ARCH" = "x86_64" ]; then
		if [ ! -e $2/usr/bin/qemu-aarch64-static ]; then
			echo "please cp /usr/bin/qemu-aarch64-static $2/usr/bin/qemu-aarch64-static"
			cp -a /usr/bin/qemu-aarch64-static $2/usr/bin/qemu-aarch64-static
		fi
	fi
	if [ ! -d $2 ]; then
		echo "$2 is not a directory"
		exit
	fi
	[ -z "`ls $2/proc`" ] && mount --bind /proc $2/proc
	[ -z "`mount |grep $2 |grep -v nodev |grep dev`" ] && mount --bind /dev $2/dev
	[ -z "`mount |grep $2 |grep pts`" ] && mount --bind /dev/pts $2/dev/pts
	[ -z "`ls $2/dev/shm`" ] && mount --bind /dev/shm $2/dev/shm
	[ -z "`ls $2/sys`" ] && mount --bind /sys $2/sys
	sudo chroot $2
else
	umount $2/proc
	umount $2/sys
	umount $2/dev/pts
	umount $2/dev/shm
	umount $2/dev
	umount $2
fi

3. chroot.sh脚本用法

sudo ./chroot.sh mount target 	挂载文件系统，再进行定制化增删操作
sudo ./chroot.sh umount target 	解除文件系统挂载

4. 常见问题

问题1：安装软件提示no space left on device

解决方法：

sudo fsck.ext4 -f rootfs.img		 检查img镜像文件
sudo resize2fs rootfs.img 1250000 		扩容img镜像文件

问题2：无法联网

解决方法：

sudo cp /etc/resolv.conf ./target/etc/   将虚拟机resolv.conf文件拷贝到文件系统目录