Linux系统初始化脚本

#查看centos的版本号 
CentOS_version=`cut -d" " -f 4 /etc/centos-release | cut -d"." -f 1`
#改变PS3格式
PS3="Please enter the option you need to optimize: "
#网卡名称
network_name=`ip a|sed -r -n ‘s/.. (e.*):.*/\1/p‘`
#网卡的个数
network_card_sum=`echo $network_name | wc -w`


######################判断是否root用户######################
Judge_root() {
if [[ `id | sed -r -n "s/uid=([0-9]{1,4}).*/\1/p"` != 0 ]];then
　　echo -e "\e[1;31mYou are not a root user and you are not allowed to set this optimization.\e[0m\n"
　　break
fi 
}

######################关闭防火墙和selinux######################
close_firewalld_selinux() {
　　Judge_root
　　if [ $CentOS_version == 7 ];then
   　　 systemctl stop firewalld && systemctl disable firewalld &> /dev/null
   　　 systemctl stop NetworkManager && systemctl disable NetworkManager &> /dev/null
   　　 sed -i "s/SELINUX=enforcing/SELINUX=disabled/" /etc/selinux/config
   　　 setenforce 0
　　elif [ $CentOS_version == 6 ];then
  　　  service firewalld stop &> /dev/null && chkconfig firewalld off &> /dev/null
   　　 service NetworkManager stop &> /dev/null && chkconfig NetworkManager off &> /dev/null
   　　 sed -i "s/SELINUX=enforcing/SELINUX=disabled/" /etc/selinux/config
   　　 setenforce 0
　　fi 
}

#######################更换yum源######################
replace_yum() {
　　Judge_root
　　if [ $CentOS_version == 7 ];then
 　　   curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo &> /dev/null
　　　　sed -i -e ‘/mirrors.cloud.aliyuncs.com/d‘ -e ‘/mirrors.aliyuncs.com/d‘ /etc/yum.repos.d/CentOS-Base.repo
　　　　curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo &> /dev/null
　　　　rm -rf /var/cache/yum && yum makecache &> /dev/null 
　　elif [ $CentOS_version == 6 ];then
　　　　curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo &> /dev/null
　　　　sed -i -e ‘/mirrors.cloud.aliyuncs.com/d‘ -e ‘/mirrors.aliyuncs.com/d‘ /etc/yum.repos.d/CentOS-Base.repo
　　　　curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo &> /dev/null
　　　　rm -rf /var/cache/yum && yum makecache &> /dev/null
　　fi
}

#######################下载基础包######################
download_package() {
　　yum install bash-completion ntpdate lrzsz bzip2 vim net-tools -y &> /dev/null
　　source /usr/share/bash-completion/bash_completion
}

#######################修改网卡名称######################
network_card_name() {
　　Judge_root
　　if [[ $network_card_sum != 1 ]];then
　　　　i=0
　　　　for card in `echo $network_name`;do
　　　　　　mv /etc/sysconfig/network-scripts/ifcfg-$card /etc/sysconfig/network-scripts/ifcfg-eth$i
　　　　　　sed -ri -e ‘s/(NAME=).*/\1eth$i/g‘ -e ‘s/(DEVICE=).*/\1eth$i/g‘ /etc/sysconfig/network-scripts/ifcfg-eth$i
　　　　　　let i++
　　　　done
　　　　sed -i -r "/GRUB_CMDLINE_LINUX/s/(.*quiet)(.*)/\1 net.ifnames=0\2/g" /etc/default/grub
　　　　grub2-mkconfig -o /etc/grub2.cfg &> /dev/null
　　else
　　　　mv /etc/sysconfig/network-scripts/ifcfg-$network_name /etc/sysconfig/network-scripts/ifcfg-eth0
　　　　sed -ri -e ‘s/(NAME=).*/\1eth0/g‘ -e ‘s/(DEVICE=).*/\1eth0/g‘ /etc/sysconfig/network-scripts/ifcfg-eth0
　　　　sed -i -r "/GRUB_CMDLINE_LINUX/s/(.*quiet)(.*)/\1 net.ifnames=0\2/g" /etc/default/grub
　　　　grub2-mkconfig -o /etc/grub2.cfg &> /dev/null
　　fi
}

#######################添加alias######################
add_alias() {
　　if [ ! -f /etc/profile.d/env.sh ];then
　　　　echo -e "alias rm=‘echo RM is busy, please use MV‘\nalias ping=‘ping -c4‘" > /etc/profile.d/env.sh
　　else
　　　　sed -ri "s/(alias rm.*)/#\1/g" ~/.bashrc
　　　　sed -i -e "/alias rm/d" -e "/alias ping/d" /etc/profile.d/env.sh
　　　　echo -e "alias rm=‘echo RM is busy, please use MV‘\nalias ping=‘ping -c4‘" >> /etc/profile.d/env.sh
　　fi
}


#######################修改PS1######################
modify_PS1() {
　　Judge_root
　　if [ ! -f /etc/profile.d/env.sh ];then
　　　　echo ‘export PS1="\[\e[32;1m\][\[\e[33;1m\]\u\[\e[31;1m\]@\[\e[33;1m\]\h \[\e[36;1m\]\W\[\e[32;1m\]]\[\e[34;1m\]\\\$ \[\e[0m\]"‘ > /etc/profile.d/env.sh
　　else
　　　　sed -i "/PS1/d" /etc/profile.d/env.sh 
　　　　echo ‘export PS1="\[\e[32;1m\][\[\e[33;1m\]\u\[\e[31;1m\]@\[\e[33;1m\]\h \[\e[36;1m\]\W\[\e[32;1m\]]\[\e[34;1m\]\\\$ \[\e[0m\]"‘ >> /etc/profile.d/env.sh
　　fi
}

#######################设置.vimrc######################
modify_vimrc() {
cat > /root/.vimrc <<EOF
set encoding=utf-8 "字符编码设置
set syntax=on "语法高亮
set completeopt=preview,menu "代码补全
set smartindent "开启新行时使用智能自动缩进 set autoindent自动缩进,等价于set ai
set number "显示行号，vim临时添号行号可以写成set nu，去除行号可以写成set nonu
set history=500 "历史记录数
set ignorecase "搜索忽略大小写
set ruler "显示标尺
set showcmd "输入的命令显示出来，看的清楚些
set tabstop=4 "Tab键的宽度
set shiftwidth=4 "这个是用于程序中自动缩进所使用的空白长度指示的
set expandtab "使代码风格尽量保持一致，一般不允许在代码使用TAB符，而以2个空格代之。
set softtabstop=4 "按下tab键，插入的是空格和tab制表符的混合
set cursorline "设置光标行线
function AddshTitle()
call setline(1,"#!/bin/bash")
call setline(2,"#*************************************************************************************")
call setline(3,"#-*- coding:utf-8 -*-")
call setline(4,"#File : " . expand("%"))
call setline(5,"#Author : Cloud_zeng")
call setline(6,"#Date : " . strftime("%F %T"))
call setline(7,"#*************************************************************************************")
call setline(8,"")
endf
function AddpyTitle()
call setline(1,"#!/usr/bin/env python")
call setline(2,"#*************************************************************************************")
call setline(3,"#-*- coding:utf-8 -*-")
call setline(4,"#File : " . expand("%"))
call setline(5,"#Author : Cloud_zeng")
call setline(6,"#Date : " . strftime("%F %T"))
call setline(7,"#*************************************************************************************")
call setline(8,"")
endf
autocmd BufNewFile *.sh exec ":call AddshTitle()"
autocmd BufNewFile *.py exec ":call AddpyTitle()"
autocmd BufNewFile * normal G
EOF
}

#######################修改时区######################
automatic_update_time(){
　　yum install cronie -y &> /dev/null
　　ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
　　hwclock &> /dev/null
　　echo ‘*/10 * * * * /usr/sbin/ntpdate -u ntp.aliyun.com &> /dev/null‘ >> /var/spool/cron/root
　　systemctl restart crond
}

#######################ssh调整######################
ssh_adjust(){
　　Judge_root
　　sed -ri -e ‘s/^(GSSAPIAuthentication ).*/\1no/‘ -e ‘s/#(UseDNS.*)/\1/‘ /etc/ssh/sshd_config
　　systemctl restart sshd
}

#######################最大文件打开数######################
limits_tune(){
Judge_root
echo ‘
* soft nofile 128000
* hard nofile 256000

root soft nofile 128000
root hard nofile 256000
‘ >> /etc/security/limits.conf
}

 

#######################安装python3######################
add_python3() {
　　Judge_root
　　yum install gcc libffi-devel zlib-devel readline-devel -y &> /dev/null
　　cd /usr/local/src/
　　wget https://www.python.org/ftp/python/3.7.4/Python-3.7.4.tar.xz &> /dev/null
　　tar xf Python-3.7.4.tar.xz && cd Python-3.7.4
　　mkdir -p /usr/local/python3
　　./configure --prefix=/usr/local/python3
　　make && make install
　　sed -ri "s@^(^PATH=)(.*)@\1/usr/local/python3/bin:\2@g" .bash_profile

cat > /usr/local/python3/site-packages/tab.py <<EOF
import sys,readline,rlcompleter,atexit,os
readline.parse_and_bind(‘tab: complete‘)
histfile = os.path.join(os.environ[‘HOME‘], ‘.pythonhistory‘)
try:
　　readline.read_history_file(histfile)
except IOError:
　　pass
　　atexit.register(readline.write_history_file, histfile)
atexit.register(readline.write_history_file, histfile)
EOF

　　echo ‘export PYTHONSTARTUP=/usr/local/python3/site-packages/tab.py‘ >> .bash_profile 

　　source ~/.bash_profile

}

select choice in download_package replace_yum close_firewalld_selinux add_alias network_card_name modify_PS1 modify_vimrc automatic_update_time ssh_adjust limits_tune add_python3 all quit;do

case $choice in
download_package)
　　download_package
　　echo -e "\e[1;33mBasic package download completed\e[0m\n"
　　;;
replace_yum)
　　replace_yum
　　echo -e "\e[1;33mYum source replacement is complete\e[0m\n"
　　;;
close_firewalld_selinux)
　　close_firewalld_selinux
　　echo -e "\e[1;33mFirewalld and selinux have been closed\e[0m\n"
　　;;
network_card_name)
　　network_card_name
　　echo -e "\e[1;33mThe NIC name has been modified, \e[1;31mbut it needs to be restarted to take effect.\e[0m\n"
　　;;
modify_PS1)
　　modify_PS1
　　echo -e "\e[1;33mPS1 has been modified\e[0m\n"
　　;;
modify_vimrc)
　　modify_vimrc
　　echo -e "\e[1;33m.vimrc has been set up\e[0m\n"
　　;;
automatic_update_time)
　　automatic_update_time
　　echo -e "\e[1;33mSet automatic update time to complete\e[0m\n"
　　;;
ssh_adjust)
　　ssh_adjust
　　echo -e "\e[1;33mssh service has been tuned to complete\e[0m\n"
　　;;
limits_tune)
　　limits_tune
　　echo -e "\e[1;33mThe maximum number of open files has been set.\e[0m\n"
　　;;
add_alias)
　　add_alias
　　echo -e "\e[1;33mAlias setting completed\e[0m\n"
　　;;
add_python3)
　　add_python3
　　echo -e "\e[1;33mPython3 installed completed\e[0m\n" 
　　;;
all)
　　download_package
　　replace_yum
　　close_firewalld_selinux
　　network_card_name
　　modify_PS1
　　modify_vimrc
　　automatic_update_time
　　ssh_adjust
　　limits_tune
　　add_alias
　　echo -e "\e[1;31mAll scripts are executed, if circumstances permit. Please restart, if not, then reconnect. Take effect some configurations\e[0m"
　　exit
　　;;
quit)
　　echo -e "\e[1;31mSome profiles need to be reconnected to take effect\e[0m\n"
　　exit
　　;;
esac
done