Centos6 anf Centos7 system_init

#! / bin/bash

# this script is mainly aimed at tuning the parameters of the system that has just been installed.

# check id root #

If [$(id-u)! = "0"]; then

Echo "You must be root to run this script..."

Exit 1

Fi

# set function #

CentOS6 ()

{

Yum install-y wget

/ usr/bin/wget-qO / etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

/ usr/bin/wget-qO / etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo

Yum install-y tree screen make cmake vim ntpdate telnet nc lrzsz gcc gcc-c++

/ etc/init.d/iptables stop & & chkconfig iptables off

}

CentOS7 ()

{

Yum install-y wget

/ usr/bin/wget-qO / etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

/ usr/bin/wget-qO / etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

Yum install-y tree screen make cmake vim ntpdate telnet nc lrzsz gcc gcc-c++

Systemctl stop firewalld.service & & systemctl disable firewalld.service

}

# get system Edition #

Edition= `grep-o'[[: digit:]]'/ etc/redhat-release | head-1`

If [$Edition = ='6']; then

Echo-e "\ n\ 033 [34mStart CentOS6 installation.\ 033 [0m\ n"

CentOS6

Elif [$Edition = ='7']; then

Echo-e "\ n\ 033 [34mStart CentOS7 installation.\ 033 [0m\ n"

CentOS7

Else

Echo "This system is not CentOS 6, script execution failed..."

Exit 2

Fi

# the gorgeous split line 6 is different from the command 7, and the same command is written below # #

# disable selinux & & iptables #

Sed-I'/ SELINUX/s/enforcing/disabled/' / etc/selinux/config

Setenforce 0

# set vim #

Sed-I "7a alias vi='vim'" / root/.bashrc

Sed-I "8a alias grep='grep-- color'" / root/.bashrc

# set ssh #

Ssh_cf= "/ etc/ssh/sshd_config"

Sed-I 's/#GSSAPIAuthentication no/GSSAPIAuthentication no/g' $ssh_cf

Sed-I 's/GSSAPIAuthentication yes/#GSSAPIAuthentication yes/g' $ssh_cf

Sed-I "s/#UseDNS yes/UseDNS no/" $ssh_cf

# set ntpdate #

Echo'* / 4 * / usr/sbin/ntpdate time.windows.com > / dev/null 2 > & 1'> > / var/spool/cron/root

\ cp / usr/share/zoneinfo/Asia/Shanghai / etc/localtime

#\ cp / usr/share/zoneinfo/America/New_York / etc/localtime New York (West 5)

#\ cp / usr/share/zoneinfo/Asia/Shanghai / etc/localtime China (East 8)

#\ cp / usr/share/zoneinfo/Asia/Bangkok / etc/localtime Thailand (East 7)

#\ cp / usr/share/zoneinfo/Asia/Korea / etc/localtime Korea (East 9)

#\ cp / usr/share/zoneinfo/Asia/Tokyo / etc/localtime Japan (East 9)

# set limits #

Echo-e "* soft nofile 65535\ n * hard nofile 65535" > > / etc/security/limits.conf

# set kernel #

> / etc/sysctl.conf

Cat > > / etc/sysctl.conf