自己参考了系统优化的点，写了一个一键优化脚本，适用于centos6.x版本，各个项已经单独进行测试通过。适用于centos6.x系统最小化安装执行，可以根据自己的需求进行添加或修改完善。
主要优化内容有：
关闭系统不必要的服务；关闭selinux，关闭iptables；关闭ctrl+alt+del重启；设置ssh端口，关闭DNS解析；设置系统最大文件描述符；设置系统关键文件权限；配置安装ntp；安装vim；配置安装阿里云yum源和epel源；
脚本如下：
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[root@localhost ~]
# cat youhua.sh
#!/bin/bash
#written by mofansheng@2015-11-03
#system optimization script
#The fllow apply to CentOS 6.x
.
/etc/init
.d
/functions
function
check_ok(){
if
[ $? -
eq
0 ]
then
echo
""
continue
else
echo
"pls check error"
exit
fi
}
cat
<<EOF
-----------------------------------------------------------------------
| system optimization |
-----------------------------------------------------------------------
EOF
#close unimportant system services
echo
"===Close unimportant system services,it will take serval mintinues==="
for
s
in
`chkconfig --list|
grep
3:on|
awk
'{print $1}'
|
grep
-Ev
"crond|sshd|sysstat|rsyslog|network"
`
do
chkconfig $s off
done
check_ok
action
"Close unimportant system services"
/bin/true
#close selinux
echo
"===close SELINUX==="
if
[ `getenforce` !=
"Disabled"
]
then
sed
-i
's/SELINUX=enforcing/SELINUX=disabled/g'
/etc/selinux/config
echo
"selinux is disabled,you must reboot!"
else
action
"SELINUX is closed"
/bin/true
fi
check_ok
action
"Close SELINUX"
/bin/true
#close ctrl+alt+del
mv
/etc/init/control-alt-delete
.conf
/etc/init/control-alt-delete
.conf.bak
#close iptables
echo
"===close iptables==="
iptables-save >
/etc/sysconfig/iptables_
$(
date
+%s)
iptables -F
service iptables save
check_ok
action
"iptables is closed"
/bin/true
#set ulimit
echo
"ulimit -SHn 65535"
>>
/etc/rc
.
local
#set SSH
sed
-i
's/#UseDNS yes/UseDNS no/g'
/etc/ssh/sshd_config
sed
-i
's/#Port 22/Port 65500/g'
/etc/ssh/sshd_config
service sshd restart
#set system files permission
chmod
600
/etc/passwd
chmod
600
/etc/group
chmod
600
/etc/shadow
chmod
600
/etc/gshadow
#set ntp
yum
install
ntpdate -y
ntpdate ntp.fudan.edu.cn
echo
"* 3 * * * /usr/sbin/ntpdate ntp.fudan.edu.cn >/dev/null 2>&1"
>>
/etc/crontab
service crond restart
check_ok
action
"ntpdate is installed and add in crontab"
/bin/true
#set vim
echo
"===install vim,it will take serval mintinues==="
yum
install
vim-enhanced -y &>
/dev/null
alias
vi
=vim
echo
"alias vi=vim"
>>
/root/
.bashrc
check_ok
action
"vim is installed"
/bin/true
#set yum repos
echo
"===update yum repos,it will take serval mintinues==="
yum
install
wget -y
mv
/etc/yum
.repos.d
/CentOS-Base
.repo
/etc/yum
.repos.d
/CentOS-Base
.repo.bak
wget -O
/etc/yum
.repos.d
/CentOS-Base
.repo http:
//mirrors
.aliyun.com
/repo/Centos-6
.repo &>
/dev/null
wget -O
/etc/yum
.repos.d
/epel
.repo http:
//mirrors
.aliyun.com
/repo/epel-6
.repo &>
/dev/null
yum clean all &>
/dev/null
yum makecache &>
/dev/null
check_ok
action
"yum repos update is ok"
/bin/true
本文转自 模范生 51CTO博客，原文链接：http://blog.51cto.com/mofansheng/1710247，如需转载请自行联系原作者
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