CentOS 6 系統優化 Shell 腳本

CentOS?已經發布了6.2版了，現在已經可以用在生產環境了，新版本的內核也能更好的利用硬件。寫了一個腳本，用來初始化系統環境，現在分享出來，你可以根據自己的需要，對腳本進行相應的修改。

腳本的內容如下：?

#!/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?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 ficat?<<?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?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/rootservice?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?miSUSEsed?-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?sshsed?-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?crontabmkdir?/etc/cron.daily.bak mv?/etc/cron.daily/makewhatis.cron?/etc/cron.daily.bak mv?/etc/cron.daily/mlocate.cron?/etc/cron.daily.bakchkconfig?bluetooth?off chkconfig?cups?off chkconfig?ip6tables?off #disable?the?ipv6 cat?>?/etc/modprobe.d/ipv6.conf?<<?EOFIalias?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

對腳本的內容做一下說明：?

先對系統進行判斷，如果是Cent OS 64位，就繼續運行。

先將系統的安裝源設置為網易的（網易的安裝源算是國內比較穩定的）

安裝epel的源和rpmforge的源，利用第三方的源來讓yum安裝起來更方便

更新軟件

設置為每天凌晨四點進行時間同步（跟國家授時中心的服務器進行時間同步）

將系統同時打開的文件個數增大

將ctrl alt delete鍵進行屏蔽，防止誤操作的時候服務器重啟

關閉selinux

禁用GSSAPI來認證，也禁用DNS反向解析，加快SSH登陸速度

優化一些內核參數

調整刪除字符的按鍵為backspace（某些系統默認是delete）

打開vim的語法高亮

取消生成whatis數據庫和locate數據庫

關閉沒用的服務

關閉IPv6

轉載于:https://blog.51cto.com/jiarh/1721671

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