Linux01-bash script programming System cropping 51

Up (BASH script Programming copy system library file )

To re-edit grub as silent mode:

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

How to implement terminal prompt information:

2. Copy the host file:

cp/etc/issue/mnt/sysroot/etc/

3. Re-edit issue information:

Vim/mnt/sysroot/etc/issue

Nick release 5.9 (Final)

Kernel \ r on an \m

Http://www.mageedu.com

How to mount additional file systems defined in/etc/fstab:

• Rc.sysinit: Mount other file systems defined in the/etc/fstab

A) How to determine if the device is mounted:

awk ' {print '} '/proc/mounts | grep "/dev/hda2"

b) Swap devices cannot be mounted directly with mount:

Grep-v "\<swap\>"/etc/fstab | awk ' {print '} '

Grep-e-V "\<swap|proc|sysfs\>"/etc/fstab | awk ' {print '} '

Grep-e-V "\<swap|proc|sysfs\>"/etc/fstab | awk ' {print '} ' | While read Line;do awk ' {print '} '/proc/mounts | grep "^ $LINE";d One

4.cd/mnt/sysroot/

5.vim Etc/rc.d/rc.sysinit Modified add:

#!/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"

How to set the kernel parameter/etc/sysctl.conf:

6. Run the binary.sh transplant sysctl command;

7. Create the/etc/sysctl.conf configuration file:

cd/mnt/sysroot/

Vim/etc/sysctl.conf

Net.ipv4.ip_forward = 1

8. The power-on automatically takes effect:

Vim/etc/rc.d/rc.sysinit last line add:

Sysctl-p &>/dev/null

[&-eq 0] && Success "Set kernel parameter" | | Failure "Set Kernel parameter"

9. Start the new host and test:

Cat/proc/sys/net/ipv4/ip_forward

How to implement a user run:

• Pam:pluggable Authentication Module (pluggable configuration file);

• RHEL5 through the/etc/pam.d/* to achieve user login, authentication and so on;

• The login that bypasses the Pam,rhel display is printed by/bin/login:
  

• How the login program implements user login and authentication:

A)Nsswitch (as the middle tier of login): Network Service Switch

b) Frame:/etc/passwd,/etc/shadow,/etc/group,/etc/gshadow

Library: Libnss_file.so,libnss_nis.so,libnsss_ldap.so ...

Configuration file:/etc/nsswitch.conf

Library files:/lib/libnss*;/usr/lib/libnss*

10. Copy the user authentication library file to/lib:

cp-d/lib/libnss_files*/mnt/sysroot/lib/--->-d option, keep file links

Ls-l/mnt/sysroot/lib/

11. Copy the user authentication library file to/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. Edit the configuration file:

cp/etc/nsswitch.conf/mnt/sysroot/etc/

Vim/mnt/sysroot/etc/nsswitch.conf

passwd:files

Shadow:files

Group:files

Hosts:filesDNS

13. Create User:

Add a Hadoop user

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, Transplant Mingetty,passwd,useradd,userdel,usermod,groupadd command;

15. Modify the Inittab file:

cd/mnt/sysroot/

Vim Etc/inittab Modification:

1:2345:respawn:/sbin/mingetty tty1

2:2345:respawn:/sbin/mingetty Tty2

16. Download Login to/mnt/sysroot/bin

17. Add Execute Permissions: chmod +x/mnt/sysroot/bin/login

18. Start the new host, Init 3 to see if the user is prompted to log in;

To create a user profile:

19. Create a user command prompt configuration file:

cd/mnt/sysroot/

Vim Root/.bash_profile

Ps1= ' [\[email protected]\h \w]\$ '

Export PS1

Single-User mode:

20. Modify the root directory permissions:

cd/mnt/sysroot/

Chmod-r og=---root/

21. Define level 1 of the Inittab file:

Vim Etc/inittab Add a line:

L1:1:WAIT:/ETC/RC.D/RC 1

22. Create a 1-level service link:

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. Create a single-user singer file:

Vim Etc/rc.d/init.d/single

#!/bin/bash

#

Case $ in

Start

;;

*)

echo "Usage:single start"

;;

Esac

Exec/sbin/init S

Add Execute permission: chmod +x Etc/rc.d/init.d/single

24. Create a single-User Service link:

CD RC1.D

Ln-sv. /init.d/single S98single

25. Start testing the single-user mode for the new host:

Init 6

E

Select Kernel/vmlinuz ro root/dev/hda2 quiet input E

Enter 1--> carriage return

The B key starts booting.

This article is from "Nick Liu's blog," Please make sure to keep this source http://zkhylt.blog.51cto.com/3638719/1430050