linux centos6 系统优化脚本-经典

转载一篇Ricky的系统优化脚本，这个脚本只能针对centos6x 其他还没有测试，但centos7肯定不行的

#!/bin/bash

# ID 201510192126

# Author Ricky

# E-mail 564001002@qq.com

# CentOS 6 系统初始优化脚本 IT运维管理技术交流群 16548318

# version 1.1.0

 

 

# 检查是否为root用户，脚本必须在root权限下运行 #

if [[ "$(whoami)" != "root" ]]; then

    echo "please run this script as root !" >&2

    exit 1

fi

echo -e "\033[31m the script only Support CentOS_6 x86_64 \033[0m"

echo -e "\033[31m system initialization script, Please Seriously. press ctrl+C to cancel \033[0m"

 

 

# 按Y继续默认N，其他按键全部退出 #

yn="n"

echo "please input [Y\N]"

echo -n "default [N]: "

read yn

if [ "$yn" != "y" -a "$yn" != "Y" ]; then

   echo "bye-bye!"

   exit 0

fi

 

 

# 倒计时 #

for i in `seq -w 3 -1 1`

  do

    echo -ne "\b>>>>>$i";

    sleep 1;

  done

echo -e "\b\Good Luck"

 

 

# 检查是否为64位系统，这个脚本只支持64位脚本

platform=`uname -i`

if [ $platform != "x86_64" ];then

    echo "this script is only for 64bit Operating System !"

    exit 1

fi

echo "the platform is ok"

 

 

# 安装必要支持工具及软件工具

yum -y install redhat-lsb vim unzip openssl-client gcc gcc-c++

# clear

echo "Tools installation is complete"

 

 

# 检查系统版本为centos 6

distributor=`lsb_release -i | awk '{print $NF}'`

version=`lsb_release -r | awk '{print substr($NF,1,1)}'`

if [ $distributor != 'CentOS' -o $version != '6' ]; then

    echo "this script is only for CentOS 6 !"

    exit 1

fi

# clear

cat << EOF

+---------------------------------------+

|   your system is CentOS 6 x86_64      |

|           start optimizing            |

+---------------------------------------+

EOF

sleep 3

 

 

# instll repo

yum_update(){

#make the 163.com as the default yum repo

if [ ! -e "/etc/yum.repos.d/bak" ]; then

    mkdir /etc/yum.repos.d/bak

    mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/bak/CentOS-Base.repo.backup

fi

 

#add

wget http://mirrors.163.com/.help/CentOS6-Base-163.repo -O /etc/yum.repos.d/CentOS-Base.repo

 

#add the third-party repo

#rpm -Uvh http://download.Fedora.RedHat.com/pub/epel/6/x86_64/epel-release-6-5.noarch.rpm

rpm -Uvh ftp://ftp.muug.mb.ca/mirror/centos/6.7/extras/x86_64/Packages/epel-release-6-8.noarch.rpm

#add the epel

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

 

#add the rpmforge

rpm -Uvh http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-rpmforge-dag

 

#update the system

yum clean all && yum makecache

yum -y update glibc\*

yum -y update yum\* rpm\* python\*

yum -y update

echo -e "\033[31m yum update ok \033[0m"

sleep 1

}

 

 

#time zone

zone_time(){

#install ntp

yum -y install ntp

 

#time zone

if [ `date +%z` != "+0800" ]; then

    rm -rf /etc/localtime

    ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

cat > /etc/sysconfig/clock << EOF

ZONE="Asia/Shanghai"

UTC=false

ARC=false

EOF

 

if [ `date +%z` != "+0800" ]; then

    echo "The Shanghai time zone error"

    rm -rf /etc/localtime

    ln -sf /usr/share/zoneinfo/Asia/Chongqing /etc/localtime

cat > /etc/sysconfig/clock << EOF

ZONE="Asia/Chongqing"

UTC=false

ARC=false

EOF

 

if [ `date +%z` != "+0800" ]; then

    echo "The Chongqing time zone error"

    rm -rf /etc/localtime

 

    ln -sf /usr/share/zoneinfo/Asia/Hong_Kong /etc/localtime

cat > /etc/sysconfig/clock << EOF

ZONE="Asia/Hang_Kong"

UTC=false

ARC=false

EOF

 

if [ `date +%z` != "+0800" ]; then

    echo "The Hang_Kong time zone error， To write Shanghai time zone "

    echo -e "\033[31m time zone error , please manual settings \033[0m"

    rm -rf /etc/localtime

    ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

cat > /etc/sysconfig/clock << EOF

ZONE="Asia/Shanghai"

UTC=false

ARC=false

EOF

fi

fi

fi

fi

 

echo "Present time zone:"`date +%z`

cat /etc/sysconfig/clock

echo -e "\033[31m time zone ok \033[0m"

sleep 1

 

 

# set time

echo "update time please wait!"

/usr/sbin/ntpdate 210.72.145.44 > /dev/null 2>&1

#sed -i "/ntpdate/s/^/#/g" /var/spool/cron/root

sed -i "/ntpdate/d" /var/spool/cron/root

sed -i "/hwclock/d" /var/spool/cron/root

cat >> /var/spool/cron/root << EOF

*/5 * * * * /usr/sbin/ntpdate 210.72.145.44 > /dev/null 2>&1

* * * * */1 /usr/sbin/hwclock -w > /dev/null 2>&1

EOF

chmod 600 /var/spool/cron/root

/sbin/service crond restart

echo -e "\033[31m time zone ok \033[0m"

sleep 1

}

 

 

# set hosts

hosts(){

#修改hostname为127.0.0.1

if [ "$(hostname -i)" != "127.0.0.1" ]; then

    sed -i "s@^127.0.0.1\(.*\)@127.0.0.1 `hostname`\1@" /etc/hosts

fi

 

hostname -i

echo -e "\033[31m hosts ok \033[0m"

sleep 1

}

 

 

#set the file limit

limits_config(){

#修改文件打开数

sed -i "/^ulimit -SHn.*/d" /etc/rc.local

echo "ulimit -SHn 102400" >> /etc/rc.local

 

sed -i "/^ulimit -s.*/d" /etc/profile

sed -i "/^ulimit -c.*/d" /etc/profile

sed -i "/^ulimit -SHn.*/d" /etc/profile

 

cat >> /etc/profile << EOF

#

#

#

ulimit -c unlimited

ulimit -s unlimited

ulimit -SHn 102400

EOF

 

source /etc/profile

ulimit -a

cat /etc/profile | grep ulimit

echo -e "\033[31m hosts ok \033[0m"

 

if [ ! -f "/etc/security/limits.conf.bak" ]; then

    cp /etc/security/limits.conf /etc/security/limits.conf.bak

fi

sed -i "/^*.*soft.*nofile/d" /etc/security/limits.conf

sed -i "/^*.*hard.*nofile/d" /etc/security/limits.conf

sed -i "/^*.*soft.*nproc/d" /etc/security/limits.conf

sed -i "/^*.*hard.*nproc/d" /etc/security/limits.conf

cat >> /etc/security/limits.conf << EOF

#

#

#

#

#---------custom-----------------------

#

*           soft   nofile       65535

*           hard   nofile       65535

*           soft   nproc        65535

*           hard   nproc        65535

EOF

cat /etc/security/limits.conf | grep "^*           .*"

echo -e "\033[31m limits ok \033[0m"

sleep 1

}

 

 

# tune kernel parametres #优化内核参数

sysctl_config(){

#delete

if [ ! -f "/etc/sysctl.conf.bak" ]; then

    cp /etc/sysctl.conf /etc/sysctl.conf.bak

fi

sed -i "/^net.ipv4.ip_forward/d" /etc/sysctl.conf

sed -i "/^net.ipv4.conf.default.rp_filter/d" /etc/sysctl.conf

sed -i "/^net.ipv4.conf.default.accept_source_route/d" /etc/sysctl.conf

sed -i "/^kernel.sysrq/d" /etc/sysctl.conf

sed -i "/^kernel.core_uses_pid/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_syncookies/d" /etc/sysctl.conf

sed -i "/^kernel.msgmnb/d" /etc/sysctl.conf

sed -i "/^kernel.msgmax/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_max_tw_buckets/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_sack/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_window_scaling/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_rmem/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_wmem/d" /etc/sysctl.conf

sed -i "/^net.core.wmem_default/d" /etc/sysctl.conf

sed -i "/^net.core.rmem_default/d" /etc/sysctl.conf

sed -i "/^net.core.rmem_max/d" /etc/sysctl.conf

sed -i "/^net.core.wmem_max/d" /etc/sysctl.conf

sed -i "/^net.core.netdev_max_backlog/d" /etc/sysctl.conf

sed -i "/^net.core.somaxconn/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_max_orphans/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_max_syn_backlog/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_timestamps/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_synack_retries/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_syn_retries/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_tw_recycle/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_tw_reuse/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_mem/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_fin_timeout/d" /etc/sysctl.conf

sed -i "/^net.ipv4.tcp_keepalive_time/d" /etc/sysctl.conf

sed -i "/^net.ipv4.ip_local_port_range/d" /etc/sysctl.conf

#sed -i "/^net.ipv4.tcp_tw_len/d" /etc/sysctl.conf

 

#add

cat >> /etc/sysctl.conf << EOF

#

#

#

#

#-------custom---------------------------------------------

#

net.ipv4.ip_forward = 0

net.ipv4.conf.default.rp_filter = 1

net.ipv4.conf.default.accept_source_route = 0

kernel.sysrq = 0

kernel.core_uses_pid = 1

net.ipv4.tcp_syncookies = 1

kernel.msgmnb = 65536

kernel.msgmax = 65536

net.ipv4.tcp_max_tw_buckets = 6000

net.ipv4.tcp_sack = 1

net.ipv4.tcp_window_scaling = 1

net.ipv4.tcp_rmem = 4096    87380   4194304

net.ipv4.tcp_wmem = 4096    16384   4194304

net.core.wmem_default = 8388608

net.core.rmem_default = 8388608

net.core.rmem_max = 16777216

net.core.wmem_max = 16777216

net.core.netdev_max_backlog = 262144

net.core.somaxconn = 262144

net.ipv4.tcp_max_orphans = 3276800

net.ipv4.tcp_max_syn_backlog = 262144

net.ipv4.tcp_timestamps = 0

#net.ipv4.tcp_synack_retries = 1

net.ipv4.tcp_synack_retries = 2

#net.ipv4.tcp_syn_retries = 1

net.ipv4.tcp_syn_retries = 2

net.ipv4.tcp_tw_recycle = 1

net.ipv4.tcp_tw_reuse = 1

net.ipv4.tcp_mem = 94500000 915000000 927000000

#net.ipv4.tcp_fin_timeout = 1

net.ipv4.tcp_fin_timeout = 15

net.ipv4.tcp_keepalive_time = 30

net.ipv4.ip_local_port_range = 1024    65535

#net.ipv4.tcp_tw_len = 1

EOF

 

#buckets

echo 6000 > /proc/sys/net/ipv4/tcp_max_tw_buckets

 

#delete

sed -i "/^kernel.shmmax/d" /etc/sysctl.conf

sed -i "/^kernel.shmall/d" /etc/sysctl.conf

 

#add

shmmax=`free -l |grep Mem |awk '{printf("%d\n",$2*1024*0.9)}'`

shmall=$[$shmmax/4]

echo "kernel.shmmax = "$shmmax >> /etc/sysctl.conf

echo "kernel.shmall = "$shmall >> /etc/sysctl.conf

 

#bridge

modprobe bridge

lsmod|grep bridge

 

#reload sysctl

/sbin/sysctl -p

echo -e "\033[31m sysctl ok \033[0m"

sleep 1

}

 

 

# control-alt-delete

set_key(){

#set the control-alt-delete to guard against the miSUSE

sed -i 's#^exec /sbin/shutdown -r now#\#exec /sbin/shutdown -r now#' /etc/init/control-alt-delete.conf

cat /etc/init/control-alt-delete.conf | grep /sbin/shutdown

echo -e "\033[31m control-alt-delete ok \033[0m"

sleep 1

}

 

 

#disable selinux #关闭SELINUX

selinux(){

sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config

setenforce 0

echo -e "\033[31m selinux ok \033[0m"

sleep 1

}

 

 

#set sshd_config UseDNS

ssh_GSS(){

#sed -i 's/^GSSAPIAuthentication yes$/GSSAPIAuthentication no/' /etc/ssh/sshd_config

sed -i '/^#UseDNS/s/#UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config

sed -i 's/#UseDNS yes/UseDNS no/' /etc/ssh/sshd_config

sed -i 's/#PermitEmptyPasswords no/PermitEmptyPasswords no/g' /etc/ssh/sshd_config

/etc/init.d/sshd restart

cat /etc/ssh/sshd_config | grep -i usedns

cat /etc/ssh/sshd_config | grep -i PermitEmptyPasswords

echo -e "\033[31m sshd ok \033[0m"

sleep 1

}

 

 

#define the backspace button can erase the last character typed

backspace_button(){

sed -i "/^stty erase ^H/d" /etc/profile

echo 'stty erase ^H' >> /etc/profile

sed -i "/^syntax.*/d" /root/.vimrc

echo "syntax on" >> /root/.vimrc

echo -e "\033[31m backspace ok \033[0m"

cat /etc/profile | grep -i "stty erase ^H"

cat /root/.vimrc | grep -i "syntax"

sleep 1

}

 

 

#stop some crontab

stop_crond(){

if [ ! -e "/etc/cron.daily.bak" ]; then

    mkdir /etc/cron.daily.bak

    mv /etc/cron.daily/makewhatis.cron /etc/cron.daily.bak > /dev/null 2>&1

    mv /etc/cron.daily/mlocate.cron /etc/cron.daily.bak > /dev/null 2>&1

fi

echo -e "\033[31m crond ok \033[0m"

sleep 1

}

 

 

#disable some service

dissable_service(){

chkconfig bluetooth off > /dev/null 2>&1

chkconfig cups off  > /dev/null 2>&1

chkconfig ip6tables off  > /dev/null 2>&1

chkconfig | grep -E "cups|ip6tables|bluetooth"

echo -e "\033[31m service ok \033[0m"

sleep 1

}

 

 

#disable the ipv6

stop_ipv6(){

cat > /etc/modprobe.d/ipv6.conf << EOFI

#

#

#

#---------------custom-----------------------

#

alias net-pf-10 off

options ipv6 disable=1

EOFI

sed -i "/^NETWORKING_IPV6.*/d" /etc/sysconfig/network

echo "NETWORKING_IPV6=off" >> /etc/sysconfig/network

cat /etc/sysconfig/network | grep NETWORKING_IPV6

echo -e "\033[31m ipv6 ok \033[0m"

sleep 1

}

 

 

#language..

inittab(){

if [ -z "$(cat /etc/redhat-release | grep '6\.')" ];then

    sed -i 's/3:2345:respawn/#3:2345:respawn/g' /etc/inittab

    sed -i 's/4:2345:respawn/#4:2345:respawn/g' /etc/inittab

    sed -i 's/5:2345:respawn/#5:2345:respawn/g' /etc/inittab

    sed -i 's/6:2345:respawn/#6:2345:respawn/g' /etc/inittab

    sed -i 's/ca::ctrlaltdel/#ca::ctrlaltdel/g' /etc/inittab

    sed -i 's@LANG=.*$@LANG="en_US.UTF-8"@g' /etc/sysconfig/i18n

else

    sed -i 's@^ACTIVE_CONSOLES.*@ACTIVE_CONSOLES=/dev/tty[1-2]@' /etc/sysconfig/init

    sed -i 's@^start@#start@' /etc/init/control-alt-delete.conf

fi

/sbin/init q

 

#locale

echo $LANG

echo -e "\033[31m inittab ok \033[0m"

sleep 1

}

 

 

# iptables

iptables(){

#add iptables

yum -y install iptables

 

#iptables conf bak

if [ ! -e "/etc/sysconfig/iptables.bak" ]; then

    cp /etc/sysconfig/iptables /etc/sysconfig/iptables.bak > /dev/null 2>&1

fi

 

#add config

cat > /etc/sysconfig/iptables << EOF

# Firewall configuration written by system-config-securitylevel

# Manual customization of this file is not recommended.

# 防火墙规则有先后顺序，修改前请测试确定后更改

# E-Mail:564001002@QQ.COM

*filter

:INPUT DROP [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

:syn-flood - [0:0]

 

#RELATED,ESTABLISHED

-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

 

#io

-A INPUT -i lo -j ACCEPT

 

#ping

-A INPUT -p icmp -j ACCEPT

 

#redis

#-A INPUT -p tcp -m tcp --dport 6379 -j ACCEPT

#-A INPUT -s 127.0.0.1/32 -p tcp -m tcp --dport 6379 -j ACCEPT

 

#mysql

#-A INPUT -p tcp -m tcp --dport 3306 -j ACCEPT

#-A INPUT -s 127.0.0.1/32 -p tcp -m tcp --dport 3306 -j ACCEPT

 

#memcache

#-A INPUT -p tcp -m tcp --dport 11211 -j ACCEPT

#-A INPUT -s 127.0.0.1/32 -p tcp -m tcp --dport 11211 -j ACCEPT

 

#php

#-A INPUT -p tcp -m tcp --dport 9000 -j ACCEPT

#-A INPUT -s 127.0.0.1/32 -p tcp -m tcp --dport 9000 -j ACCEPT

 

#ssh

-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT

#-A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m recent --update --seconds 60 --hitcount 10 --name SSH --rsource -j DROP

#-A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m recent --set --name SSH --rsource -j ACCEPT

 

#http  500 * 90%  需要限制情况下可以取消第一行注释

#-A INPUT -p tcp -m tcp --dport 80 -m connlimit --connlimit-above 500 --connlimit-mask 32 -j REJECT --reject-with icmp-port-unreachable

-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT

 

#https 500 * 90% 需要限制情况下可以取消第一行注释

#-A INPUT -p tcp -m tcp --dport 443 -m connlimit --connlimit-above 500 --connlimit-mask 32 -j REJECT --reject-with icmp-port-unreachable

-A INPUT -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT

 

#---service--------------------------------------------------

#DNS 安装DNS服务器后需要打开

#-A INPUT -p udp --sport 53  -j ACCEPT

 

#ntp 配置ntp服务器时候需要打开

#-A INPUT -p udp --sport 123 -j ACCEPT

 

#对外访问，比如api接口 需要结合OUTPUT DROP 全部关闭情况下才需要打开，这种限制非常严格情况下才配置

#-A OUTPUT -p tcp --dport 80 -j ACCEPT

#-A OUTPUT -p tcp --dport 443 -j ACCEPT

 

######################################################################################

#以下#号部分未测试或为成功，并可能有错误开启之前请先测试，并保证能与你的环境匹配

#syn-flood

#-A syn-flood -p tcp -m limit --limit 500/sec --limit-burst 10000 -j RETURN

 

#------FIN SYN RST ACK SYN-----------------

#-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m limit --limit 1/sec -j ACCEPT

#-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m limit --limit 10/sec --limit-burst 100 -j ACCEPT

######################################################################################

 

#PORTSAN 端口扫描拒绝，缺少工具没能测试好，请慎用。

#-A INPUT -p tcp --syn -m recent --name portscan --rcheck --seconds 60 --hitcount 10 -j LOG

#-A INPUT -p tcp --syn -m recent --name portscan --set -j DROP

 

-A INPUT -j REJECT --reject-with icmp-host-prohibited

-A syn-flood -j REJECT --reject-with icmp-port-unreachable

-A FORWARD -j REJECT --reject-with icmp-host-prohibited

 

COMMIT

EOF

/sbin/service iptables restart

source /etc/profile

chkconfig iptables on

/sbin/iptables -L -v

chkconfig | grep iptables

echo -e "\033[31m iptables ok \033[0m"

sleep 1

}

 

 

# others

other(){

# initdefault

sed -i 's/^id:.*$/id:3:initdefault:/' /etc/inittab

/sbin/init q

cat /etc/inittab | grep "id:"

 

# PS1 /tmp/

sed -i "/^PS1=.*/d" /etc/profile

echo 'PS1="\[\e[37;40m\][\[\e[32;40m\]\u\[\e[37;40m\]@\h \[\e[35;40m\]\W\[\e[0m\]]\\$ \[\e[33;40m\]"' >> /etc/profile

 

# HISTSIZ

sed -i 's/^HISTSIZE=.*$/HISTSIZE=300/' /etc/profile

cat /etc/profile | grep "^HISTSIZE"

 

# Record command

sed -i "/^export PROMPT_COMMAND=.*/d" /root/.bash_profile

echo "export PROMPT_COMMAND='{ msg=\$(history 1 | { read x y; echo \$y; });user=\$(whoami); echo \$(date \"+%Y-%m-%d %H:%M:%S\"):\$user:\`pwd\`/:\$msg ---- \$(who am i); } >> /tmp/\`hostname\`.\`whoami\`.history-timestamp'" >> /root/.bash_profile

 

# Wrong password five times locked 180s

sed -i "/^auth        required      pam_tally2.so deny=5 unlock_time=180/d" /etc/pam.d/system-auth

sed -i '4a auth        required      pam_tally2.so deny=5 unlock_time=180' /etc/pam.d/system-auth

source /etc/profile

cat /etc/pam.d/system-auth | grep "auth        required      pam_tally2.so"

echo -e "\033[31m other ok \033[0m"

sleep 1

}

 

 

# done

done_ok(){

cat << EOF

+-------------------------------------------------+

|               optimizer is done                 |

|   it's recommond to restart this server !       |

|            E-mail:564001002@QQ.COM              |

|                                                 |

|             Please Reboot system                |

+-------------------------------------------------+

EOF

}

 

 

# main

main(){

    yum_update

    zone_time

    hosts

    limits_config

    sysctl_config

    set_key

    selinux

    ssh_GSS

    backspace_button

    stop_crond

    dissable_service

    stop_ipv6

    inittab

    iptables

    other

    done_ok

}

main