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Linux01-BASH脚本编程之系统裁剪51
上接(BASH脚本编程之拷贝系统库文件50)
重新编辑grub为静默模式:
1.vim /mnt/boot/grub/grub.conf
default=0
timeout=3
title Nick Linux(2.6.18)
kernel /vmlinuz ro root/dev/hda2 quiet
initrd /initrd.gz
如何实现终端提示信息:
2.复制宿主机文件:
cp /etc/issue /mnt/sysroot/etc/
3.重新编辑issue信息:
vim /mnt/sysroot/etc/issue
Nick release 5.9 (Final)
Kernel \r on an \m
http://www.mageedu.com
如何挂载/etc/fstab中定义的其他文件系统:
rc.sysinit:挂载/etc/fstab中定义的其它文件系统
a)怎么判断设备是否挂载:
awk ‘{print $1}‘ /proc/mounts | grep "/dev/hda2"
b)swap设备不能使用mount直接挂载:
grep -v "\<swap\>" /etc/fstab | awk ‘{print $1}‘
grep -E -v "\<swap|proc|sysfs\>" /etc/fstab | awk ‘{print $1}‘
grep -E -v "\<swap|proc|sysfs\>" /etc/fstab | awk ‘{print $1}‘ | while read LINE;do awk ‘{print $1}‘ /proc/mounts | grep "^$LINE";done
4.cd /mnt/sysroot/
5.vim etc/rc.d/rc.sysinit修改添加:
#!/bin/bash
#
. /etc/rc.d/init.d/functions
echo -e "\tWelcome to\033[34mNick Team\033[0m Linux."
echo "Remount rootfs ..."
mount -n -o remount,rw /
[ $? -eq 0 ] && success "Remount rootfs" || failure "Remount rootfs"
mount -a
[ $? -eq 0 ] && success "Mount others filesystem" || failure "Mount others filesystem"
echo "Set the hostname ..."
[ -f /etc/sysconfig/network ] && . /etc/sysconfig/network
[ -z $HOSTNAME -o "$HOSTNAME" == ‘(none)‘ ] && HOSTNAME=localhost
/bin/hostname $HOSTNAME
[ $? -eq 0 ] && success "Set the hostname" || failure "Set the hostname"
echo "Initialization network device ..."
/sbin/insmod /lib/modules/mii.ko
/sbin/insmod /lib/modules/pcnet32.ko
[ $? -eq 0 ] && success "Initialization network device" || failure "Initialization network device"
ifconfig lo 127.0.0.1/8
[ $? -eq 0 ] && success "Activating loopback network device" || failure "Activating loopback network device"
如何设定内核参数/etc/sysctl.conf:
6.运行binary.sh移植sysctl命令;
7.创建/etc/sysctl.conf配置文件:
cd /mnt/sysroot/
vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
8.开机自动生效:
vim /etc/rc.d/rc.sysinit最后行添加:
sysctl -p &> /dev/null
[ &? -eq 0 ] && success "Set kernel parameter" || failure "Set kernel parameter"
9.启动新主机,测试:
cat /proc/sys/net/ipv4/ip_forward
如何实现用户运行:
PAM:Pluggable Authentication Module(可插入式配置文件);
RHEL5 通过/etc/pam.d/*来实现用户的登录、认证等等;
绕过PAM,RHEL的登录显示通过/bin/login打印显示:
login程序如何实现用户登录和认证:
a)nsswitch(作为login的中间层):Network Service Switch
b)框架:/etc/passwd,/etc/shadow,/etc/group,/etc/gshadow
库:libnss_file.so,libnss_nis.so,libnsss_ldap.so ...
配置文件:/etc/nsswitch.conf
库文件:/lib/libnss*;/usr/lib/libnss*
10.复制用户验证库文件到/lib:
cp -d /lib/libnss_files* /mnt/sysroot/lib/ --->-d选项,保留文件链接
ls -l /mnt/sysroot/lib/
11.复制用户验证库文件到/usr/lib:
cp -d /usr/lib/libnss_files.so /mnt/sysroot/usr/lib/
cp -d /usr/lib/libnss3.so /usr/lib/libnssckbi.so /usr/lib/libnssutil3.so /mnt/sysroot/usr/lib/
ls -l /mnt/sysroot/usr/lib/
12、编辑配置文件:
cp /etc/nsswitch.conf /mnt/sysroot/etc/
vim /mnt/sysroot/etc/nsswitch.conf
passwd:files
shadow:files
group:files
hosts:filesdns
13、创建用户:
添加hadoop用户
grep -E "^(root|hadoop)\>" /etc/passwd > /mnt/sysroot/etc/passwd
grep -E "^(root|hadoop)\>" /etc/shadow > /mnt/sysroot/etc/shadow
grep -E "^(root|hadoop)\>" /etc/group > /mnt/sysroot/etc/group
14、移植mingetty,passwd,useradd,userdel,usermod,groupadd命令;
15、修改inittab文件:
cd /mnt/sysroot/
vim etc/inittab修改:
1:2345:respawn:/sbin/mingetty tty1
2:2345:respawn:/sbin/mingetty tty2
16.下载login到/mnt/sysroot/bin
17.添加执行权限:chmod +x /mnt/sysroot/bin/login
18.启动新主机,init 3 看是否提示用户登录;
创建用户配置文件:
19.创建用户命令提示符配置文件:
cd /mnt/sysroot/
vim root/.bash_profile
PS1=‘[\u@\h \W]\$‘
export PS1
单用户模式:
20.修改root目录权限:
cd /mnt/sysroot/
chmod -R og=--- root/
21.定义inittab文件的1级别:
vim etc/inittab添加一行:
l1:1:wait:/etc/rc.d/rc 1
22.创建1级别服务链接:
cd /mnt/sysroot/etc/rc.d
mkdir rc1.d
cd rc1.d
ln -sv ../init.d/network K90network
ln -sv ../init.d/tserver K33tserver
23.创建单用户singer文件:
vim etc/rc.d/init.d/single
#!/bin/bash
#
case $1 in
start)
;;
*)
echo "Usage:Single start"
;;
esac
exec /sbin/init S
添加执行权限:chmod +x etc/rc.d/init.d/single
24、创建单用户服务链接:
cd rc1.d
ln -sv ../init.d/single S98single
25、开始测试新主机的单用户模式:
init 6
e
选择kernel /vmlinuz ro root/dev/hda2 quiet输入e
输入1--> 回车
b键开始引导.
本文出自 “Nick Liu的博文” 博客,请务必保留此出处http://zkhylt.blog.51cto.com/3638719/1430050