制作ubuntu rootfs

下载base镜像：

http://cdimage.ubuntu.com/ubuntu-base/releases/16.04.1/release/

解压：

tar -zxf ubuntu-xx-base-amd64.tar.gz -C ./ubuntu-rootfs/

apt-get install qemu-user-static

cp /usr/bin/qemu-amd64-static usr/bin

cp -b /etc/resolv.conf etc/

#!/bin/bash

#

function mnt() {

echo "MOUNTING"

sudo mount -t proc /proc ${2}proc

sudo mount -t sysfs /sys ${2}sys

sudo mount -o bind /dev ${2}dev

sudo mount -o bind /dev/pts ${2}dev/pts

sudo chroot ${2}

}

function umnt() {

echo "UNMOUNTING"

sudo umount ${2}proc

sudo umount ${2}sys

sudo umount ${2}dev/pts

sudo umount ${2}dev

}

if [ "$1" == "-m" ] && [ -n "$2" ] ;

then

mnt $1 $2

elif [ "$1" == "-u" ] && [ -n "$2" ];

then

umnt $1 $2

else

echo ""

echo "Either 1'st, 2'nd or both parameters were missing"

echo ""

echo "1'st parameter can be one of these: -m(mount) OR -u(umount)"

echo "2'nd parameter is the full path of rootfs directory(with trailing '/')"

echo ""

echo "For example: ch-mount -m /media/sdcard/"

echo ""

echo 1st parameter : ${1}

echo 2nd parameter : ${2}

fi

sudo bash ./ch_mount.sh -m ./ubuntu-rootfs

挂载到根文件系统中去

先设置下用户名密码：

useradd -s '/bin/bash' -m -G adm,sudo yourusername

echo "Set password for yourusername:"

passwd yourusername

echo "Set password for root:"

passwd root

设置主机名：

echo 'ubuntu.yourusername' > /etc/hostname

设置自动更新dns

dpkg-reconfigure resolvconf

安装各种常用的包

apt-get install \

language-pack-en-base \

sudo \

ssh \

net-tools \

network-manager \

iputils-ping \

rsyslog \

bash-completion

apt install gcc gdb tmux wget curl vim kmod -y

打包生成镜像

#!/bin/bash

image_name=$1

set -x

rm -rf tmpfs ${image_name}.img ${image_name}.img.tar.gz

dd if=/dev/zero of=${image_name}.img bs=1G count=4

mkfs.ext4 ${image_name}.img

mkdir -p tmpfs

mount ${image_name}.img tmpfs

cp -rfp ./ubuntu-amd64/* ./tmpfs/

umount tmpfs

e2fsck -p -f ${image_name}.img

resize2fs -M ${image_name}.img

tar zcf ${image_name}.img.tar.gz ${image_name}.img