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 OS 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 [ $version != 6 ];then echo "this script is only for CentOS 6 !" exit 1 fi cat << EOF +---------------------------------------+ | your system is CentOS 6 x86_64 | | start optimizing....... | +--------------------------------------- EOF #make the 163.com as the default yum repo mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup wget http://mirrors.163.com/.help/CentOS6-Base-163.repo -O /etc/yum.repos.d/CentOS-Base.repo #add the third-party repo #add the epel rpm -Uvh http://download.Fedora.RedHat.com/pub/epel/6/x86_64/epel-release-6-5.noarch.rpm rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6 #add the rpmforge rpm -Uvh http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-rpmforge-dag #update the system and set the ntp yum clean all yum -y update glibc\* yum -y update yum\* rpm\* python\* yum -y update yum -y install ntp echo "* 4 * * * /usr/sbin/ntpdate 210.72.145.44 > /dev/null 2>&1" >> /var/spool/cron/root service crond restart #set the file limit echo "ulimit -SHn 102400" >> /etc/rc.local cat >> /etc/security/limits.conf << EOF * soft nofile 65535 * hard nofile 65535 EOF #set the control-alt-delete to guard against the miSUSE sed -i 's#exec /sbin/shutdown -r now#\#exec /sbin/shutdown -r now#' /etc/init/control-alt-delete.conf #disable selinux sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config #set ssh sed -i 's/^GSSAPIAuthentication yes$/GSSAPIAuthentication no/' /etc/ssh/sshd_config sed -i 's/#UseDNS yes/UseDNS no/' /etc/ssh/sshd_config service sshd restart #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 #define the backspace button can erase the last character typed echo 'stty erase ^H' >> /etc/profile echo "syntax on" >> /root/.vimrc #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 chkconfig bluetooth off chkconfig cups off chkconfig ip6tables off #disable the ipv6 cat > /etc/modprobe.d/ipv6.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
对脚本的内容做一下说明：
- 先对系统进行判断，如果是Cent OS 64位，就继续运行。
- 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）
- 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
- 更新软件
- 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）
- 将系统同时打开的文件个数增大
- 将ctrl alt delete键进行屏蔽，防止误操作的时候服务器重启
- 关闭selinux
- 禁用GSSAPI来认证，也禁用DNS反向解析，加快SSH登陆速度
- 优化一些内核参数
- 调整删除字符的按键为backspace（某些系统默认是delete）
- 打开vim的语法高亮
- 取消生成whatis数据库和locate数据库
- 关闭没用的服务
- 关闭IPv6
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