利用BusyBox ~私人定制 My LINUX~

# tar xf linux-3.13.6.tar.xz -C /usr/src/
# cd /usr/src
# ln -sv linux-3.13.6 linux
# cd linux
# make allnoconfig
# make menuconfig 把我们所需要的内容整合进来

[*]64-bit kernel ：64位操作系统的内核
General setup --> Local version --> -MyLinux: 给内核定一个自己的版本
Processor type and features --> Processor family --> (X)Generic-x86-64：这里是CPU类型、这个是通用x86-64
[*]Symmetric multi-processing support：选择CPU支持多核心处理
[*]Enable loadable module support:选择内核动态模块加载
Bus options (PCI etc.) --> [*]PCI suppor：支持PCI总线
Device Drivers --> <*>SCSI device support -->[*]SCSI disk support要支持SCSI硬盘
Device Drivers -->Fusion MPT device support (NEW) --> <*>Fusion MPT ScsiHost drivers for SPI、<*>Fusion MPT misc device (ioctl) driver、[*]Fusion MPT logging facility：支持对硬盘的驱动
File systems --> <*>The Extended 4 (ext4) filesystem：支持文件系统
Executable file formats / Emulations --> [*]Kernel support for ELF binaries、[*]Write ELF core dumps with partial segments (NEW)、 <*>Kernel support for scripts starting with #!:可执行文件的格式
Device Drivers -->Input device support --> [*]Keyboards -> <*>AT keyboard (NEW) [*]Mice：支持输入输出设备、比如健盘
Device Drivers > USB support  > <*>UHCI HCD (most Intel and VIA) support、<*>OHCI HCD (USB 1.1) support、<*>EHCI HCD (USB 2.0) support:USB设备驱动
Device Drivers > Generic Driver Options > [*] Maintain a devtmpfs filesystem to mount at /dev [*]Automount devtmpfs at /dev, after the kernel mounted the rootfs
Networking support > Networking options[*] TCP/IP networking [*]IP:multicasting [*]IP: advanced router[*]IP: policy routing [*]IP: verbose route monitoring[*]   IP: kernel level autoconfiguration[*]IP: DHCP support[*]IP: BOOTP support[*]     IP: RARP support<*>IP: tunneling <*>Unix domain sockets<*>   UNIX: socket monitoring interface：支持协议
Device Drivers > Network device support > Ethernet driver support[*]Intel devices (NEW)<*>Intel(R) PRO/1000 Gigabit Ethernet support<*>Intel(R) PRO/1000 PCI-Express Gigabit Ethernet support：只要Intel的、其他的他都去掉、这是选择网卡设备的驱动程序
[ ]Wireless：这个无线网、我们去掉去、用不着

# cp .config /root/config-3.13.6-x86_64
# make bzImage
# cp arch/x86/boot/bzImage /mnt/boot/
# grub-install --root-directory=/mnt /dev/sdb

$ make allyesconfig
$ make

# yum -y install libmcrypt-devel
# rpm --install glibc-static-2.12-1.132.el6.x86_64.rpm
# tar xf busybox-1.22.1.tar.bz2
# cd busybox-1.22.1
# make menuconfig
# make
# make install

# vim /mnt/sysroot/etc/fstab
/dev/sda1       /boot   ext4    defaults        0 0
proc            /proc   proc    defaults        0 0
sysfs           /sys    sysfs   defaults        0 0
/dev/sda2       /       ext4    defaults        0 0
/dev/sda3       swap    swap    defaults        0 0

#!/bin/sh
#
打印系统启动时的欢迎信息
echo -e "\tWecome to \033[34mMini\033[0m Linux"
判断/etc/sysroot/network是否存在并且可读、条件成立就source进来
[ -r /etc/sysconfig/network ] && . /etc/sysconfig/network
判断$HOSTNAME是否为空并且$HOSTNAME==NONE、如果为空就给个默认值
[ -z "$HOSTNAME" -o "$HOSTNAME" == "(none)" ] && HOSTNAME=localhost
给HOSTNAME赋值为定义好的HOSTNAME的值
/bin/hostname $HOSTNAME
挂载文件系统
echo "mounting proc filesystem..."
mount -t proc proc /proc
echo "mounting sysfs filesystem..."
mount -t sysfs sysfs /sys
自动探测各硬件设备、并且能够探测到的都装载设备文件
mdev -s
给系统配置一个IP地址
ifconfig lo 127.0.0.1
ifconfig eth0 172.16.254.188
mount -a
mkdir /dev/pts
mount -t devpts devpts /dev/pts

::sysinit:/etc/rc.d/rc.sysinit 明确指定要找/etc/rc.d/rc.sysinit文件
::respawn:/sbin/getty 19200 tty1
::respawn:/sbin/getty 19200 tty2
::respawn:/sbin/getty 19200 tty3
::respawn:/sbin/getty 19200 tty4
::respawn:/sbin/getty 19200 tty5
::respawn:/sbin/getty 19200 tty6 ：19200表示每秒钟传输的速率、getty是一个串型终端、他会调用一个登录界面让用户输入登录信息进行验证
tty6::askfirst:/bin/sh 启用6个虚拟终端
console::respawn:-/bin/sh 启用一个终端，如果出错重新启动respawn、-表示敲一回车才可以启用sh
::ctrlaltdel:/sbin/reboot 定义组合键、按ctrl+alt+del就reboot
::shutdown:/bin/umount -a -r 如果要要关机就卸载已挂载的设备、然后关机

# useradd busybox
# passwd busybox
密码也设置为：busybox
# head -1 /etc/passwd > /mnt/sysroot/etc/passwd
# tail -1 /etc/passwd >> /mnt/sysroot/etc/passwd
# vim /mnt/sysroot/etc/passwd
root:x:0:0:root:/root:/bin/sh
busybox:x:502:503::/home/busybox:/bin/sh
# head -1 /etc/group > /mnt/sysroot/etc/group
# tail -1 /etc/group >> /mnt/sysroot/etc/group
# head -1 /etc/shadow > /mnt/sysroot/etc/shadow
# tail -1 /etc/shadow >> /mnt/sysroot/etc/shadow
# cat /mnt/sysroot/etc/shadow
提供一个登录欢迎信息、创建一个issue文件
# vim /mnt/sysroot/etc/issue
MyLinux is CentOS release 6.5
Kernel \r on an \m
提供主机名
# mkdir /mnt/sysroot/etc/sysconfig
 # vim /mnt/sysroot/etc/sysconfig/network
HOSTNAME=mylinux.tanxw.com
提供命令提示符和环境变量
# vim /mnt/sysroot/etc/profile
export PS1=‘[\u@\h \A \W]\$ ‘
PATH="/usr/local/sbin:/usr/local/bin:/sbin/:/bin:/usr/sbin:/usr/bin:$PATH"
# chmod +x /mnt/sysroot/etc/rc.d/rc.sysinit
# sync  同步数据到磁盘中去

#!/bin/bash
#
# description: dropbear ssh daemon
# chkconfig: 2345 66 33
#
dsskey=/etc/dropbear/dropbear_dss_host_key
rsakey=/etc/dropbear/dropbear_rsa_host_key
lockfile=/var/lock/subsys/dropbear
pidfile=/var/run/dropbear.pid
dropbear=/usr/local/sbin/dropbear
dropbearkey=/usr/local/bin/dropbearkey
[ -r /etc/rc.d/init.d/functions ] && . /etc/rc.d/init.d/functions
[ -r /etc/sysconfig/dropbear ] && . /etc/sysconfig/dropbear
keysize=${keysize:-1024}
port=${port:-22}
gendsskey() {
    [ -d /etc/dropbear ] || mkdir /etc/dropbear
    echo -n "Starting generate the dss key: "
    $dropbearkey -t dss -f $dsskey &> /dev/null
    RETVAL=$?
    if [ $RETVAL -eq 0 ]; then
        success
        echo
        return 0
    else
        failure
        echo
        return 1
    fi 
}
genrsakey() {
    [ -d /etc/dropbear ] || mkdir /etc/dropbear
    echo -n "Starting generate the rsa key: "
    $dropbearkey -t rsa -s $keysize -f $rsakey &> /dev/null
    RETVAL=$?
    if [ $RETVAL -eq 0 ]; then
        success
        echo
        return 0
    else
        failure
        echo
        return 1
    fi 
}
start() {
    [ -e $dsskey ] || gendsskey
    [ -e $rsakey ] || genrsakey
    if [ -e $lockfile ]; then
        echo -n "dropbear daemon is already running: "
        success
        echo
        exit 0
    fi
    echo -n "Starting dropbear: "
    daemon --pidfile="$pidfile" $dropbear -p $port -d $dsskey -r $rsakey
    RETVAL=$?
    echo
    if [ $RETVAL -eq 0 ]; then
         touch $lockfile
         return 0
     else
          rm -f $lockfile $pidfile
          return 1
      fi
}
stop() {
       if [ ! -e $lockfile ]; then
           echo -n "dropbear service is stopped: "
           success
           echo
           exit 1
        fi
            echo -n "Stopping dropbear daemon: "
            killproc dropbear
            RETVAL=$?
            echo
        if [ $RETVAL -eq 0 ]; then
            rm -f $lockfile $pidfile
            return 0
        else
            return 1
        fi
}
status() {
      if [ -e $lockfile ]; then
          echo "dropbear is running..."
      else
          echo "dropbear is stopped..."
      fi
}
usage() {
            echo "Usage: dropbear {start|stop|restart|status|gendsskey|genrsakey}"
}
case $1 in
start)
      start ;;
stop)
      stop ;;
restart)
      stop
      start
      ;;
status)
      status
      ;;
gendsskey)
      gendsskey
      ;;
genrsakey)
      genrsakey
      ;;
*)
      usage
      ;;
esac

# mkdir /mnt/sysroot/etc/dropbear
# dropbearkey -t rsa -s 1024 -f /mnt/sysroot/etc/dropbear/dropbear_rsa_host_key
# dropbearkey -t dss -f /mnt/sysroot/etc/dropbear/dropbear_dss_host_key

# cp -d /lib64/libnss_files* /mnt/sysroot/lib64
# cp -d /usr/lib64/libnss3.so /mnt/sysroot/usr/lib64/
# cp -d /usr/lib64/libnss_files.so /mnt/sysroot/usr/lib64/
# cp /etc/nsswitch.conf /mnt/sysroot/etc/
# vim /mnt/sysroot/etc/nsswitch.conf
只保留以下几项、其他的都不需要：
    passwd:     files
    shadow:     files
    group:      files 
    hosts:      files dns

# vim /etc/shells
/bin/sh
/bin/hush
/bin/ash
/sbin/nologin
/bin/bash

# yum -y install pcre-devel
# tar xf nginx-1.4.2.tar.bz
# cd nginx-1.4.2
# ./configure --prefix=/usr/local --conf-path=/etc/nginx/nginx.cnf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --user=nginx --group=nginx --without-pcre --without-http_rewrite_module --without-http_geo_module --without-http_uwsgi_module --without-http_fastcgi_module --without-http_scgi_module --without-http_memcached_module
--prefix=/usr/local:指定第三方软件安装目录
--conf-path=/etc/nginx/nginx.cnf：指定主配置文件的路径
 --error-log-path=/var/log/nginx/error.log：指定错误日志存放路径
--http-log-path=/var/log/nginx/access.log：指定访问日志
--group=nginx：以nginx用户身份运行、反正不要以管理员的身份去运行
--group=nginx：nginx用户组
其他的选项都是nginx默认选项、我们都去掉
# make
# make install
# useradd nginx
# cd /usr/local/sbin
# ./nginx
# ss -tnl 查看80端口是否已经处于监听状态

# mkdir /mnt/sysroot/var/log/nginx
# mkdir /mnt/sysroot/usr/local/logs
# mkdir -pv /mnt/sysroot/var/lock/subsys
# chmod +x /mnt/sysroot/var/log/nginx
# chmod +x /mnt/sysroot/tmp/
# sync