CentOS 6 初始化脚本

cheng029

• #!/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 [ $version != 6 ];then
• echo "this script is only for CentOS 6 !"
• exit 1
• fi
• cat << EOF
• +---------------------------------------+
• |   your system is CentOS 6 x86_64      |
• |        start optimizing.......                   |
• +---------------------------------------
• EOF
• #make the 163.com as the default yum repo
• mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
• wget http://mirrors.163.com/.help/CentOS6-Base-163.repo -O /etc/yum.repos.d/CentOS-Base.repo
• #add the third-party repo
• #add the epel
• rpm -Uvh http://download.fedora.redhat.co ... ease-6-5.noarch.rpm
• rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
• #add the rpmforge
• rpm -Uvh http://packages.sw.be/rpmforge-r ... 2.el6.rf.x86_64.rpm
• rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-rpmforge-dag
• #update the system and set the ntp
• yum clean all
• yum install kernel-devel kernel-headers && echo exclude=kernel* >> /etc/yum.conf
• yum -y update glibc\*
• yum -y update yum\* rpm\* python\*
• yum -y update
• yum -y install ntp
• echo "* 4 * * * /usr/sbin/ntpdate 210.72.145.44 > /dev/null 2>&1" >> /var/spool/cron/root
• service crond restart
• #set the file limit
• echo "ulimit -SHn 102400" >> /etc/rc.local
• cat >> /etc/security/limits.conf << EOF
• *           soft   nofile       65535
• *           hard   nofile       65535
• EOF
• #set the control-alt-delete to guard against the misuse
• sed -i 's#exec /sbin/shutdown -r now#\#exec /sbin/shutdown -r now#' /etc/init/control-alt-delete.conf
• #disable selinux
• sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
• #set ssh
• sed -i 's/^GSSAPIAuthentication yes$/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（给不太熟悉的哥们扫扫盲，高手直接绕开就行）：
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

kution

穿别人的鞋，走自己的路，让他们找去吧。

窝窝插件

男人与女人,终究也只是欲望的动物吧!真的可以因为爱而结合吗?对不起,我也不知道。。

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alibabamama

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