centos有用的shell脚本(yum源,ssh,系统优化等)
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- #!/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 [ $version != 6 ];then
- echo "this script is only for CentOS 6 !"
- exit 1
- fi
- cat<< EOF
- +---------------------------------------+
- | your system is CentOS 6 x86_64 |
- | start optimizing....... |
- +---------------------------------------
- EOF
- #make the 163.com as the default yum repo
- mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
- wget http://mirrors.163.com/.help/CentOS6-Base-163.repo -O /etc/yum.repos.d/CentOS-Base.repo
- #add the third-party repo
- #add the epel
- rpm -Uvh http://mirrors.ustc.edu.cn/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm
- rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
- #add the rpmforge
- rpm -Uvh http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm
- rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-rpmforge-dag
- #update the system and set the ntp
- yum clean all
- yum -y update glibc\*
- yum -y update yum\* rpm\* python\*
- yum -y update
- yum -y install ntp
- echo "* 4 * * * /usr/sbin/ntpdate 210.72.145.44 > /dev/null 2>&1" >> /var/spool/cron/root
- servicecrond restart
- #set the file limit
- echo "ulimit -SHn 102400" >> /etc/rc.local
- cat>> /etc/security/limits.conf<< EOF
- * softnofile 65535
- * hardnofile 65535
- EOF
- #set the control-alt-delete to guard against the miSUSE
- sed -i 's#exec /sbin/shutdown -r now#\#exec /sbin/shutdown -r now#' /etc/init/control-alt-delete.conf
- #disableselinux
- sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
- #set ssh
- sed -i 's/^GSSAPIAuthentication yes$/GSSAPIAuthentication no/' /etc/ssh/sshd_config
- sed -i 's/#UseDNS yes/UseDNS no/' /etc/ssh/sshd_config
- servicesshd 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
- chkconfigbluetooth 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'srecommond 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
本文出自 “技术为王” 博客,请务必保留此出处http://wangzhenyu.blog.51cto.com/2996939/1111752
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