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 $*

原文地址：https://blog.51cto.com/14623268/2486741

时间： 2024-10-25 15:57:21

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