linux 系统优化脚本

#!/bin/bash
# Date: 2018-6-8
#version:1.2
#实现功能：一键系统优化15项脚本，适用于Centos6.x
################################################
#Source function library.
. /etc/init.d/functions
#date
DATE=`date +"%y-%m-%d %H:%M:%S"`
#ip
IPADDR=`grep "IPADDR" /etc/sysconfig/network-scripts/ifcfg-eth0|cut -d= -f 2 `
#hostname
HOSTNAME=`hostname -s`
#user
USER=`whoami`
#disk_check
DISK_SDA=`df -h |grep -w "/" |awk '{print $5}'`
#cpu_average_check
cpu_uptime=`cat /proc/loadavg|awk '{print $1,$2,$3}'`
#set LANG
export LANG=zh_CN.UTF-8
#Require root to run this script.
uid=`id | cut -d\( -f1 | cut -d= -f2`
if [ $uid -ne 0 ];then
  action "Please run this script as root." /bin/false
  exit 1
fi
#"stty erase ^H"
\cp /root/.bash_profile  /root/.bash_profile_$(date +%F)
erase=`grep -wx "stty erase ^H" /root/.bash_profile |wc -l`
if [ $erase -lt 1 ];then
    echo "stty erase ^H" >>/root/.bash_profile
    source /root/.bash_profile
fi
#Config Yum CentOS-Bases.repo and save Yum file
configYum(){
echo "================更新为国内YUM源=================="
  cd /etc/yum.repos.d/
  \cp CentOS-Base.repo CentOS-Base.repo.$(date +%F)
  ping -c 1 mirrors.aliyun.com >/dev/null
  if [ $? -eq 0 ];then
  wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
  else
    echo "无法连接网络。"
    exit $?
  fi
echo "==============保存YUM源文件======================"
sed -i 's#keepcache=0#keepcache=1#g' /etc/yum.conf     
grep keepcache /etc/yum.conf
sleep 5
action "配置国内YUM完成"  /bin/true
echo "================================================="
echo ""
  sleep 2
}
#Charset zh_CN.UTF-8
initI18n(){
echo "================更改为中文字符集================="
  \cp /etc/sysconfig/i18n /etc/sysconfig/i18n.$(date +%F)
>/etc/sysconfig/i18n
cat >>/etc/sysconfig/i18n<<EOF
LANG="zh_CN.UTF-8"
#LANG="en_US.UTF-8"
SYSFONT="latarcyrheb-sun16"
EOF
  source /etc/sysconfig/i18n
  echo '#cat /etc/sysconfig/i18n'
  grep LANG /etc/sysconfig/i18n
action "更改字符集zh_CN.UTF-8完成" /bin/true
echo "================================================="
echo ""
  sleep 2
}
#Close Selinux and Iptables
initFirewall(){
echo "============禁用SELINUX及关闭防火墙=============="
  \cp /etc/selinux/config /etc/selinux/config.$(date +%F)
  /etc/init.d/iptables stop
  sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
  setenforce 0
  /etc/init.d/iptables status
  echo '#grep SELINUX=disabled /etc/selinux/config ' 
  grep SELINUX=disabled /etc/selinux/config 
  echo '#getenforce '
  getenforce 
action "禁用selinux及关闭防火墙完成" /bin/true
echo "================================================="
echo ""
  sleep 2
}
#Init Auto Startup Service
initService(){
echo "===============精简开机自启动===================="
  export LANG="en_US.UTF-8"
  for A in `chkconfig --list |grep 3:on |awk '{print $1}' `;do chkconfig $A off;done
  for B in rsyslog network sshd crond;do chkconfig $B on;done
  echo '+--------which services on---------+'
  chkconfig --list |grep 3:on
  echo '+----------------------------------+'
  export LANG="zh_CN.UTF-8"
action "精简开机自启动完成" /bin/true
echo "================================================="
echo ""
  sleep 2
}
#Removal system and kernel version login before the screen display
initRemoval(){
echo "======去除系统及内核版本登录前的屏幕显示======="
#must use root user run scripts
if    
   [ $UID -ne 0 ];then
   echo This script must use the root user ! ! ! 
   sleep 2
   exit 0
fi
    >/etc/redhat-release
    >/etc/issue
action "去除系统及内核版本登录前的屏幕显示" /bin/true
echo "================================================="
echo ""
  sleep 2
}
#Change sshd default port and prohibit user root remote login.
initSsh(){
echo "========修改ssh默认端口禁用root远程登录=========="
  \cp /etc/ssh/sshd_config /etc/ssh/sshd_config.$(date +%F)
  sed -i 's/#Port 22/Port 52113/g' /etc/ssh/sshd_config
  sed -i 's/#PermitEmptyPasswords no/PermitEmptyPasswords no/g' /etc/ssh/sshd_config
  sed -i 's/#PermitRootLogin yes/PermitRootLogin no/g' /etc/ssh/sshd_config
  sed -i 's/#UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config
  echo '+-------modify the sshd_config-------+'
  echo 'Port 52113'
  echo 'PermitEmptyPasswords no'
  echo 'PermitRootLogin no'
  echo 'UseDNS no'
  echo '+------------------------------------+'
  /etc/init.d/sshd reload && action "修改ssh默认参数完成" /bin/true || action "修改ssh参数失败" /bin/false
echo "================================================="
echo ""
  sleep 2
}
#time sync
syncSysTime(){
echo "================配置时间同步====================="
  \cp /var/spool/cron/root /var/spool/cron/root.$(date +%F) 2>/dev/null
  NTPDATE=`grep ntpdate /var/spool/cron/root 2>/dev/null |wc -l`
  if [ $NTPDATE -eq 0 ];then
    echo "#times sync by lee at $(date +%F)" >>/var/spool/cron/root
    echo "*/5 * * * * /usr/sbin/ntpdate time.windows.com >/dev/null 2>&1" >> /var/spool/cron/root
  fi
  echo '#crontab -l'  
  crontab -l
action "配置时间同步完成" /bin/true
echo "================================================="
echo ""
  sleep 2
}
#install tools
initTools(){
    echo "#####安装系统补装工具(选择最小化安装minimal)#####"
    ping -c 2 mirrors.aliyun.com
    sleep 2
    yum install tree nmap sysstat lrzsz dos2unix -y
    sleep 2
    rpm -qa tree nmap sysstat lrzsz dos2unix
    sleep 2
action "安装系统补装工具(选择最小化安装minimal)" /bin/true
echo "================================================="
echo ""
  sleep 2
}
#add user and give sudoers
addUser(){
echo "===================新建用户======================"
#add user
while true
do  
    read -p "请输入新用户名:" name
    NAME=`awk -F':' '{print $1}' /etc/passwd|grep -wx $name 2>/dev/null|wc -l`
    if [ ${#name} -eq 0 ];then
       echo "用户名不能为空，请重新输入。"
       continue
    elif [ $NAME -eq 1 ];then
       echo "用户名已存在，请重新输入。"
       continue
    fi
useradd $name
break
done
#create password
while true
do
    read -p "为 $name 创建一个密码:" pass1
    if [ ${#pass1} -eq 0 ];then
       echo "密码不能为空，请重新输入。"
       continue
    fi
    read -p "请再次输入密码:" pass2
    if [ "$pass1" != "$pass2" ];then
       echo "两次密码输入不相同，请重新输入。"
       continue
    fi
echo "$pass2" |passwd --stdin $name
break
done
sleep 1
#add visudo
echo "#####add visudo#####"
\cp /etc/sudoers /etc/sudoers.$(date +%F)
SUDO=`grep -w "$name" /etc/sudoers |wc -l`
if [ $SUDO -eq 0 ];then
    echo "$name  ALL=(ALL)       NOPASSWD: ALL" >>/etc/sudoers
    echo '#tail -1 /etc/sudoers'
    grep -w "$name" /etc/sudoers
    sleep 1
fi
action "创建用户$name并将其加入visudo完成"  /bin/true
echo "================================================="
echo ""
sleep 2
}
#Adjust the file descriptor(limits.conf)
initLimits(){
echo "===============加大文件描述符===================="
  LIMIT=`grep nofile /etc/security/limits.conf |grep -v "^#"|wc -l`
  if [ $LIMIT -eq 0 ];then
  \cp /etc/security/limits.conf /etc/security/limits.conf.$(date +%F)
  echo '*                  -        nofile         65535'>>/etc/security/limits.conf
  fi
  echo '#tail -1 /etc/security/limits.conf'
  tail -1 /etc/security/limits.conf
  ulimit -HSn 65535
  echo '#ulimit -n'
  ulimit -n
action "配置文件描述符为65535" /bin/true
echo "================================================="
echo ""
sleep 2
}
#set ssh
initSsh(){
echo "======禁用GSSAPI来认证，也禁用DNS反向解析，加快SSH登陆速度======="
sed -i 's/^GSSAPIAuthentication yes$/GSSAPIAuthentication no/' /etc/ssh/sshd_config
sed -i 's/#UseDNS yes/UseDNS no/' /etc/ssh/sshd_config
service sshd restart
action "禁用GSSAPI来认证，也禁用DNS反向解析，加快SSH登陆速度" /bin/true
echo "================================================="
echo ""
sleep 2
}
#set the control-alt-delete to guard against the miSUSE
initRestart(){
sed -i 's#exec /sbin/shutdown -r now#\#exec /sbin/shutdown -r now#' /etc/init/control-alt-delete.conf
action "将ctrl alt delete键进行屏蔽，防止误操作的时候服务器重启" /bin/true
echo "================================================="
echo ""
sleep 2
}
#Optimizing the system kernel
initSysctl(){
echo "================优化内核参数====================="
SYSCTL=`grep "net.ipv4.tcp" /etc/sysctl.conf |wc -l`
if [ $SYSCTL -lt 10 ];then
\cp /etc/sysctl.conf /etc/sysctl.conf.$(date +%F)
cat >>/etc/sysctl.conf<<EOF
net.ipv4.tcp_fin_timeout = 2
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_keepalive_time = 600
net.ipv4.ip_local_port_range = 4000 65000
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.route.gc_timeout = 100
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_synack_retries = 1
net.core.somaxconn = 16384
net.core.netdev_max_backlog = 16384
net.ipv4.tcp_max_orphans = 16384
net.netfilter.nf_conntrack_max = 25000000
net.netfilter.nf_conntrack_tcp_timeout_established = 180
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 120
net.netfilter.nf_conntrack_tcp_timeout_close_wait = 60
net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 120
EOF
fi
  \cp /etc/rc.local /etc/rc.local.$(date +%F)  
  modprobe nf_conntrack
  echo "modprobe nf_conntrack">> /etc/rc.local
  modprobe bridge
  echo "modprobe bridge">> /etc/rc.local
  sysctl -p  
action "内核调优完成" /bin/true
echo "================================================="
echo ""
  sleep 2
}
#setting history and login timeout
initHistory(){
echo "======设置默认历史记录数和连接超时时间======"
echo "TMOUT=300" >>/etc/profile
echo "HISTSIZE=5" >>/etc/profile
echo "HISTFILESIZE=5" >>/etc/profile
tail -3 /etc/profile
source /etc/profile
action "设置默认历史记录数和连接超时时间" /bin/true
echo "================================================="
echo ""
sleep 2
}
#chattr file system
initChattr(){
echo "======锁定关键文件系统======"
chattr +i /etc/passwd
chattr +i /etc/inittab
chattr +i /etc/group
chattr +i /etc/shadow
chattr +i /etc/gshadow
/bin/mv /usr/bin/chattr /usr/bin/lock
action "锁定关键文件系统" /bin/true
echo "================================================="
echo ""
sleep 2
}
#menu2
menu2(){
while true
do
clear
cat <<EOF
----------------------------------------
|****Please Enter Your Choice:[0-15]****|
----------------------------------------
(1)  新建一个用户并将其加入visudo
(2)  配置为国内YUM源镜像和保存YUM源文件
(3)  配置中文字符集
(4)  禁用SELINUX及关闭防火墙
(5)  精简开机自启动
(6)  去除系统及内核版本登录前的屏幕显示
(7)  修改ssh默认端口及禁用root远程登录
(8)  设置时间同步
(9)  安装系统补装工具(选择最小化安装minimal)
(10) 加大文件描述符
(11) 禁用GSSAPI来认证，也禁用DNS反向解析，加快SSH登陆速度
(12) 将ctrl alt delete键进行屏蔽，防止误操作的时候服务器重启
(13) 系统内核调优
(14) 设置默认历史记录数和连接超时时间
(15) 锁定关键文件系统
(0) 返回上一级菜单
EOF
read -p "Please enter your Choice[0-15]: " input2
case "$input2" in
  0)
  clear
  break 
  ;;
  1)
  addUser
  ;;
  2)
  configYum
  ;;
  3)
  initI18n
  ;;
  4)
  initFirewall
  ;;
  5)
  initService
  ;;
  6)
  initRemoval
  ;;
  7)
  initSsh
  ;;
  8)
  syncSysTime
  ;;
  9)
  initTools
  ;;
  10)
  initLimits
  ;;
  11)
  initSsh
  ;;
  12)
  initRestart
  ;;
  13)
  initSysctl
  ;;
  14)
  initHistory
  ;;
  15)
  initChattr
  ;;
  *) echo "----------------------------------"
     echo "|          Warning!!!            |"
     echo "|   Please Enter Right Choice!   |"
     echo "----------------------------------"
     for i in `seq -w 3 -1 1`
       do 
         echo -ne "\b\b$i";
  sleep 1;
     done
     clear
esac
done
}
#initTools
#menu
while true
do
clear
echo "========================================"
echo '          Linux Optimization            '   
echo "========================================"
cat << EOF
|-----------System Infomation-----------
| DATE       :$DATE
| HOSTNAME   :$HOSTNAME
| USER       :$USER
| IP         :$IPADDR
| DISK_USED  :$DISK_SDA
| CPU_AVERAGE:$cpu_uptime
----------------------------------------
|****Please Enter Your Choice:[1-3]****|
----------------------------------------
(1) 一键优化
(2) 自定义优化
(3) 退出
EOF
#choice
read -p "Please enter your choice[0-3]: " input1
case "$input1" in
1) 
  addUser
  configYum
  initI18n
  initFirewall
  initService
  initRemoval
  initSsh
  syncSysTime
  initTools
  initLimits
  initSsh
  initRestart
  initSysctl
  initHistory
  initChattr
  ;;
2)
  menu2
  ;;
3) 
  clear 
  break
  ;;
*)   
  echo "----------------------------------"
  echo "|          Warning!!!            |"
  echo "|   Please Enter Right Choice!   |"
  echo "----------------------------------"
  for i in `seq -w 3 -1 1`
      do
        echo -ne "\b\b$i";
        sleep 1;
  done
  clear
esac  
done