linux裁剪--實現啓動和簡單網絡功能

        裁剪linux,在宿主機上安裝一個硬盤;創建/mnt/boot和/mnt/sysroot兩個目錄,通過grub-install安裝引導到指定的磁盤,編輯grub.conf,然後將bash和一些命令和庫文件移動到目標磁盤,將網卡模塊加載到目標系統,這樣可以實現啓動和簡單的網絡功能.

         1.創建/mnt/boot和/mnt/sysroot

mkdir /mnt/boot/ /mnt/sysroot/ -pv

         2.操作vmware添加一塊新硬盤,然後對其分區格式化和掛載

分區,格式和掛載

echo -e "n\np\n1\n\n+100M\nn\np\n2\n\n+512M\nw" |fdisk /dev/sdb

[root@localhost ~]# mkfs -t ext4 /dev/sdb1
[root@localhost ~]# mkfs -t ext4 /dev/sdb2

[root@localhost ~]# mount /dev/sdb1 /mnt/boot
[root@localhost ~]# mount /dev/sdb2 /mnt/sysroot

         3.通過腳本將bash,ls.cat,ps,vi,modinfo,insmod,cd,ifconfig,ip,route,lsmod,cp,ping 等命令複製到指定的命令

scripts

#!/bin/bash
#
target=/mnt/sysroot
clearCmd() {
  if which $cmd &> /dev/null; then
        cmdPath=`which --skip-alias $cmd`
  else
        echo "No such command"
        return 5
  fi
}
cmdCopy() {
        cmdDir=`dirname $1`
        [ -d ${target}${cmdDir} ] || mkdir -p ${target}${cmdDir}
        [ -f ${target}${1} ] || cp $1 ${target}${cmdDir}
}
libCopy() {
        for lib in `ldd $1 | grep -o "/[^[:space:]]\{1,\}"`; do
                libDir=`dirname $lib`
                [ -d ${target}${libDir} ] || mkdir -p ${target}${libDir}
                [ -f ${target}${lib} ] || cp $lib ${target}${libDir}
        done
}
while true; do
  read -p "Enter a command: " cmd
  if [ "$cmd" == 'quit' ] ;then
        echo "quit"
        exit 0
  fi
  clearCmd $cmd
  [ $? -eq 5 ] && continue
  cmdCopy $cmdPath
  libCopy $cmdPath
done

         4.複製內核和initrd文件到/mnt/boot目錄下創建根文件系統

cp /boot/initramfs-2.6.32-431.el6.x86_64.img /mnt/boot/initramfs.img
cp /boot/vmlinuz-2.6.32-431.el6.x86_64 /mnt/boot/vmlinuz

         5.通過grub-install安裝移動到指定的分區,這樣可以用來引導

grub-install --root-directory=/mnt /dev/sdb

         6.配置grub.conf文件和init文件實現引導

        grub.conf的配置

[root@localhost ~]# cat /mnt/boot/grub/grub.conf
default=0
timeout=5
title limeizhi Mini Linux
      root (hd0,0)
      kernel /vnlinuz ro root=/dev/sda2 quiet selinux=0 init=/sbin/init
      initrd /initramfs.img

        init的配置

#!/bin/sh
echo -e "Welcome to \033[32limeizhi\033[0m Linux"
mount -n -t proc /proc /proc
mount -n -t sysfs /sysfs /sys
insmod /lib/modules/e1000.ko
ifconfig lo 127.0.0.1/8
ifconfig eth0 192.168.11.240/24
route add -net 0.0.0.0 gw 192.168.11.1
/bin/bash
~

     7.目標機上啓動linux