centos6.x优化脚本

#!/bin/sh

. /etc/rc.d/init.d/functions
export LANG=zh_CN.UTF-8

#一级菜单
menu1()
{
        clear
        cat <<EOF
----------------------------------------
|****   欢迎使用cetnos6.5优化脚本   ****|
----------------------------------------
1. 一键优化
2. 自定义优化
3. 退出
EOF
        read -p "please enter your choice[1-3]:" num1
}

#二级菜单
menu2()
{
	clear
	cat <<EOF
----------------------------------------
|****Please Enter Your Choice:[0-13]****|
----------------------------------------
1. 修改字符集
2. 关闭selinux
3. 关闭firewalld
4. 精简开机启动
5. 修改文件描述符
6. 安装常用工具及修改yum源
7. 优化系统内核
8. 加快ssh登录速度
9. 禁用ctrl+alt+del重启
10.设置时间同步
11.history优化
12.返回上级菜单
13.退出
EOF
	read -p "please enter your choice[1-13]:" num2
	
}

#1.修改字符集
i18nset()
{
	echo "========================修改字符集========================="
	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"
	cat /etc/sysconfig/i18n
	action "完成修改字符集" /bin/true
	echo "==========================================================="
	sleep 2
}

#2.关闭selinux
selinuxset() 
{
	selinux_status=`grep "SELINUX=disabled" /etc/sysconfig/selinux | wc -l`
	echo "========================禁用SELINUX========================"
	if [ $selinux_status -eq 0 ];then
		sed  -i "s#SELINUX=enforcing#SELINUX=disabled#g" /etc/sysconfig/selinux
		setenforce 0
		echo '#grep SELINUX=disabled /etc/sysconfig/selinux'
		grep SELINUX=disabled /etc/sysconfig/selinux
		echo '#getenforce'
		getenforce
	else
		echo 'SELINUX已处于关闭状态'
		echo '#grep SELINUX=disabled /etc/sysconfig/selinux'
                grep SELINUX=disabled /etc/sysconfig/selinux
                echo '#getenforce'
                getenforce
	fi
		action "完成禁用SELINUX" /bin/true
	echo "==========================================================="
	sleep 2
}

#3.关闭iptables
iptablesset()
{
	echo "=======================禁用IPTABLES========================"
	/etc/init.d/iptables stop &> /dev/null
	echo '#/etc/init.d/iptables status'
	/etc/init.d/iptables status
	chkconfig iptables off
	echo '#chkconfig --list | grep iptables | awk '{print $1,$5}''
	chkconfig --list | grep iptables | awk '{print $1,$5}'
	action "完成禁用IPTABLES" /bin/true
	echo "==========================================================="
	sleep 5
}

#4.精简开机启动
chkset()
{
	echo "=======================精简开机启动========================"
	chk_list=(`/sbin/chkconfig --list | grep 3:启用 | grep -Ev "crond|sshd|network|rsyslog" |awk '{print $1}'`)
	for A in ${chk_list[*]};do
		/sbin/chkconfig $A off
	done
	echo '#chkconfig --list | grep 3:启用'
	/sbin/chkconfig --list | grep 3:启用
	action "完成精简开机启动" /bin/true
	echo "==========================================================="
	sleep 2
}

#5.修改文件描述符
limitset()
{
	echo "======================修改文件描述符======================="
	echo '* - nofile 65535'>/etc/security/limits.conf
	ulimit -SHn 65535
	echo "#cat /etc/security/limits.conf"
	cat /etc/security/limits.conf
	echo "#ulimit -Sn ; ulimit -Hn"
	ulimit -Sn ; ulimit -Hn
	action "完成修改文件描述符" /bin/true
	echo "==========================================================="
	sleep 2
}

#6.安装常用工具及修改yum源
yumset()
{
	echo "=================安装常用工具及修改yum源==================="
	yum install wget -y &> /dev/null
	if [ $? -eq 0 ];then
		cd /etc/yum.repos.d/
		\cp CentOS-Base.repo CentOS-Base.repo.$(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 &> /dev/null
			yum clean all &> /dev/null
			yum makecache &> /dev/null
		else
			echo "无法连接网络"
    			exit $?
  		fi
	else
		echo "wget安装失败"
		exit $?
	fi
	yum -y install lsof lrzsz vim lrzsz tree nmap nc sysstat &> /dev/null
	action "完成安装常用工具及修改yum源" /bin/true
	echo "==========================================================="
	sleep 2
}

#7. 优化系统内核
kernelset()
{
	echo "======================优化系统内核========================="
        chk_nf=`cat /etc/sysctl.conf | grep conntrack |wc -l`
        if [ $chk_nf -eq 0 ];then
                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 = 0
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
        sysctl -p
        else
                echo "优化项已存在。"
        fi

	action "内核调优完成" /bin/true
	echo "==========================================================="
	sleep 2
}

#8.加快ssh登录速度
sshset()
{
	echo "======================加快ssh登录速度======================"
	sed -i 's#^GSSAPIAuthentication yes$#GSSAPIAuthentication no#g' /etc/ssh/sshd_config
	sed -i 's/#UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config
	/etc/init.d/sshd restart
	echo "#grep GSSAPIAuthentication /etc/ssh/sshd_config"
	grep GSSAPIAuthentication /etc/ssh/sshd_config
	echo "#grep UseDNS /etc/ssh/sshd_config"
	grep UseDNS /etc/ssh/sshd_config
	action "完成加快ssh登录速度" /bin/true
	echo "==========================================================="
	sleep 2
}

#9. 禁用ctrl+alt+del重启
restartset()
{
	echo "===================禁用ctrl+alt+del重启===================="
	sed -i 's#exec /sbin/shutdown -r now#\#exec /sbin/shutdown -r now#' /etc/init/control-alt-delete.conf
	action "完成禁用ctrl+alt+del重启" /bin/true
	echo "==========================================================="
	sleep 2
}

#10. 设置时间同步
ntpdateset()
{
	echo "=======================设置时间同步========================"
	yum -y install ntpdate &> /dev/null
	if [ $? -eq 0 ];then
		/usr/sbin/ntpdate time.windows.com
		echo "*/5 * * * * /usr/sbin/ntpdate time.windows.com &>/dev/null" >> /var/spool/cron/root
	else
		echo "ntpdate安装失败"
		exit $?
	fi
	action "完成设置时间同步" /bin/true
	echo "==========================================================="
	sleep 2
}

#11. history优化
historyset()
{
	echo "========================history优化========================"
        chk_his=`cat /etc/profile | grep HISTTIMEFORMAT |wc -l`
        if [ $chk_his -eq 0 ];then
                cat >> /etc/profile <<'EOF'
#设置history格式
export HISTTIMEFORMAT="[%Y-%m-%d %H:%M:%S] [`whoami`] [`who am i|awk '{print $NF}'|sed -r 's#[()]##g'`]: "
#记录shell执行的每一条命令
export PROMPT_COMMAND='\
if [ -z "$OLD_PWD" ];then
    export OLD_PWD=$PWD;
fi;
if [ ! -z "$LAST_CMD" ] && [ "$(history 1)" != "$LAST_CMD" ]; then
    logger -t `whoami`_shell_dir "[$OLD_PWD]$(history 1)";
fi;
export LAST_CMD="$(history 1)";
export OLD_PWD=$PWD;'
EOF
                source /etc/profile
        else
                echo "优化项已存在。"
        fi

	action "完成history优化" /bin/true
	echo "==========================================================="
	sleep 2
}

#控制函数
main()
{
	menu1
	case $num1 in
		1)
			i18nset
			selinuxset
			iptablesset
			chkset
			limitset
			yumset
			kernelset
			sshset
			restartset
			ntpdateset
			historyset
			;;
		2)
			menu2
			case $num2 in
            		 	 1)
               				 i18nset
               				 ;;
				           2)
               			 	 selinuxset
               			 	 ;;
            		 	 3)
               			 	 iptablesset
               			 	 ;;
            		 	 4)
               			 	 chkset
               			 	 ;;
            		 	 5)
               			 	 limitset
               			 	 ;;
            		 	 6)     
					             yumset
               			 	 ;;
            		 	 7)
               			 	 kernelset
               			 	 ;;
            		 	 8)
               			 	 sshset
               			 	 ;;
            		 	 9)
               			 	 restartset
               			 	 ;;
            		 	 10)
               			 	 ntpdateset
               			 	 ;;
				           11)
					             historyset
					             ;;
				           12)
					             main
					             ;;
									 13)
					            exit
					             ;;
				             *)
					            echo 'Please select a number from [1-12].'
					            ;;
			esac
			;;
		3)
			exit
			;;
		*)
			echo 'Err:Please select a number from [1-3].'
			sleep 3
			main
			;;
	esac
}
main $*