Centos 6.2 局部优化脚本,适用于生产环境
- #!/bin/bash
- #author suzezhi
- #this script is only for CentOS 6
- #check the OS
- #先对系统进行判断,如果是Cent OS 64位,就继续运行
- 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"
- version=`lsb_release -r |awk '{print substr($2,1,1)}'`
- if [ $version != 6 ];then
- echo "this script is only for CentOS 6 !"
- exit 1
- fi
- cat << EOF
- +---------------------------------------+
- | your system is CentOS 6 x86_64 |
- | start optimizing....... |
- +---------------------------------------
- EOF
- #先将系统的安装源设置为网易的(网易的安装源算是国内比较稳定的)
- #make the 163.com as the default yum repo
- mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
- wget http://mirrors.163.com/.help/CentOS6-Base-163.repo -O /etc/yum.repos.d/CentOS-Base.repo
- #安装epel的源和rpmforge的源,利用第三方的源来让yum安装起来更方便
- #add the third-party repo
- #add the epel
- rpm -Uvh http://download.Fedora.RedHat.com/pub/epel/6/x86_64/epel-release-6-5.noarch.rpm
- rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
- #add the rpmforge
- rpm -Uvh http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm
- rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-rpmforge-dag
- #更新系统及已安装的软件,建议删除不需要的软件后进行更新;
- #update the system and set the ntp
- yum clean all
- yum -y update glibc\*
- yum -y update yum\* rpm\* python\*
- #执行系统更新,注意:如果你的服务器磁盘做了阵列,请查看阵列驱动与操作系统的兼容性
- yum -y update
- #安装NTP服务,设置为每天凌晨四点进行时间同步(跟国家授时中心的服务器进行时间同步)
- yum -y install ntp
- echo "* 4 * * * /usr/sbin/ntpdate 210.72.145.44 > /dev/null 2>&1" >> /var/spool/cron/root
- service crond restart
- #将系统同时打开的文件个数增大
- #set the file limit
- echo "ulimit -SHn 102400" >> /etc/rc.local
- cat >> /etc/security/limits.conf << EOF
- * soft nofile 65535
- * hard nofile 65535
- EOF
- #将ctrl alt delete键进行屏蔽,防止误操作的时候服务器重启
- #set the control-alt-delete to guard against the miSUSE
- sed -i 's#exec /sbin/shutdown -r now#\#exec /sbin/shutdown -r now#' /etc/init/control-alt-delete.conf
- #关闭selinux
- #disable selinux
- sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
- #禁用GSSAPI来认证
- #set ssh
- sed -i 's/^GSSAPIAuthentication yes$/GSSAPIAuthentication no/' /etc/ssh/sshd_config
- #禁用DNS反向解析
- sed -i 's/#UseDNS yes/UseDNS no/' /etc/ssh/sshd_config
- service sshd restart
- #优化一些内核参数,主要为网络性能
- #tune kernel parametres
- cat >> /etc/sysctl.conf << EOF
- net.ipv4.tcp_fin_timeout = 1
- net.ipv4.tcp_keepalive_time = 1200
- net.ipv4.tcp_mem = 94500000 915000000 927000000
- net.ipv4.tcp_tw_reuse = 1
- net.ipv4.tcp_timestamps = 0
- net.ipv4.tcp_synack_retries = 1
- net.ipv4.tcp_syn_retries = 1
- net.ipv4.tcp_tw_recycle = 1
- 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.core.wmem_default = 8388608
- net.core.rmem_default = 8388608
- EOF
- /sbin/sysctl -p
- #调整删除字符的按键为backspace(某些系统默认是delete)
- #define the backspace button can erase the last character typed
- echo 'stty erase ^H' >> /etc/profile
- #打开vim的语法高亮
- echo "syntax on" >> /root/.vimrc
- #取消生成whatis数据库和locate数据库
- #stop some crontab
- mkdir /etc/cron.daily.bak
- mv /etc/cron.daily/makewhatis.cron /etc/cron.daily.bak
- mv /etc/cron.daily/mlocate.cron /etc/cron.daily.bak
- #关闭不常用的服务,根据实际情况而定
- chkconfig bluetooth off
- chkconfig cups off
- chkconfig ip6tables off
- #禁用IPV6
- #disable the ipv6
- cat > /etc/modprobe.d/dist.conf << EOFI
- alias net-pf-10 off
- options ipv6 disable=1
- EOFI
- echo "NETWORKING_IPV6=off" >> /etc/sysconfig/network
- cat << EOF
- +-------------------------------------------------+
- | optimizer is done |
- | it's recommond to restart this server ! |
- +-------------------------------------------------+
- EOF