CentOS 6 系统优化init脚本

CentOS 已经发布了6.2版了，现在已经可以用在生产环境了，新版本的内核也能更好的利用硬件。写了一个脚本，用来初始化系统环境，现在分享出来，你可以根据自己的需要，对脚本进行相应的修改。脚本的内容如下： #！/bin/bash#author suzezhi#this script is only for CentOS 6#check the OSplatform=`uname -i`if [ $platform ！= "x86_64" ];then echo "this script is only for 64bit Operating System ！"exit 1fiecho "the platform is ok"version=`lsb_release -r |awk "{print substr（$2,1,1）}"`if [ $version ！= 6 ];thenecho "this script is only for CentOS 6 ！"exit 1fi cat << EOF+---------------------------------------+| your system is CentOS 6 x86_64 || start optimizing....... |+---------------------------------------EOF #make the 163.com as the default yum repomv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backupwget http://mirrors.163.com/.help/CentOS6-Base-163.repo -O /etc/yum.repos.d/CentOS-Base.repo #add the third-party repo#add the epelrpm -Uvh http://download.Fedora.RedHat.com/pub/epel/6/x86_64/epel-release-6-5.noarch.rpm rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6#add the rpmforgerpm -Uvh http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpmrpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-rpmforge-dag #update the system and set the ntpyum clean allyum -y update glibc*yum -y update yum* rpm* python* yum -y updateyum -y install ntpecho "* 4 * * * /usr/sbin/ntpdate 210.72.145.44 > /dev/null 2>&1" >> /var/spool/cron/rootservice crond restart #set the file limitecho "ulimit -SHn 102400" >> /etc/rc.localcat >> /etc/security/limits.conf << EOF* soft nofile 65535* hard nofile 65535EOF #set the control-alt-delete to guard against the miSUSEsed -i "s#exec /sbin/shutdown -r now##exec /sbin/shutdown -r now#" /etc/init/control-alt-delete.conf #disable selinuxsed -i "s/SELINUX=enforcing/SELINUX=disabled/" /etc/selinux/config #set sshsed -i "s/^GSSAPIAuthentication yes$/GSSAPIAuthentication no/" /etc/ssh/sshd_configsed -i "s/#UseDNS yes/UseDNS no/" /etc/ssh/sshd_configservice sshd restart #tune kernel parametrescat >> /etc/sysctl.conf << EOFnet.ipv4.tcp_fin_timeout = 1net.ipv4.tcp_keepalive_time = 1200net.ipv4.tcp_mem = 94500000 915000000 927000000net.ipv4.tcp_tw_reuse = 1net.ipv4.tcp_timestamps = 0net.ipv4.tcp_synack_retries = 1net.ipv4.tcp_syn_retries = 1net.ipv4.tcp_tw_recycle = 1net.core.rmem_max = 16777216net.core.wmem_max = 16777216net.core.netdev_max_backlog = 262144net.core.somaxconn = 262144net.ipv4.tcp_max_orphans = 3276800net.ipv4.tcp_max_syn_backlog = 262144net.core.wmem_default = 8388608net.core.rmem_default = 8388608EOF/sbin/sysctl -p #define the backspace button can erase the last character typedecho "stty erase ^H" >> /etc/profile echo "syntax on" >> /root/.vimrc #stop some crontabmkdir /etc/cron.daily.bakmv /etc/cron.daily/makewhatis.cron /etc/cron.daily.bakmv /etc/cron.daily/mlocate.cron /etc/cron.daily.bak chkconfig bluetooth offchkconfig cups offchkconfig ip6tables off #disable the ipv6cat > /etc/modprobe.d/ipv6.conf << EOFIalias net-pf-10 offoptions ipv6 disable=1EOFI echo "NETWORKING_IPV6=off" >> /etc/sysconfig/networkcat << EOF+-------------------------------------------------+| optimizer is done || it"s recommond to restart this server ！ |+-------------------------------------------------+EOF对脚本的内容做一下说明： 1.先对系统进行判断，如果是Cent OS 64位，就继续运行。 2.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） 3.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 4.更新软件 5.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） 6.将系统同时打开的文件个数增大 7.将ctrl alt delete键进行屏蔽，防止误操作的时候服务器重启 8.关闭selinux 9，禁用GSSAPI来认证，也禁用DNS反向解析，加快SSH登陆速度 10.优化一些内核参数 11.调整删除字符的按键为backspace（某些系统默认是delete） 12.打开vim的语法高亮 13.取消生成whatis数据库和locate数据库 14.关闭没用的服务 15.关闭IPv6 Linux下Cache内存释放不要盲目增加ip_conntrack_max-理解Linux内核内存相关资讯 CentOS 6

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