此脚本用于新装CentOS的相关配置工作，比如禁掉iptable和SElinux及ipv6，优化系统内核，停掉一些没必要启动的系统服务等。此脚本尤其适全大批新安装的CentOS 5.X系列的服务器，脚本代码如下所示（此脚本在Centos5.5_x64下已通过）：
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#!/bin/bash
# Created by kerryhu
# MAIL:king_819@163.com
# BLOG:http://kerry.blog.51cto.com
cat
<< EOF
+--------------------------------------------------------------+
| === Welcome to Centos System init === |
+--------------------------------------------------------------+
+--------------------------by kerry----------------------------+
EOF
#set ntp
yum -y
install
ntp
echo
"* 3 * * * /usr/sbin/ntpdate 210.72.145.44 > /dev/null 2>&1"
>>
/etc/crontab
service crond restart
#set ulimit
echo
"ulimit -SHn 102400"
>>
/etc/rc
.
local
#set locale
#true > /etc/sysconfig/i18n
#cat >>/etc/sysconfig/i18n<<EOF
#LANG="zh_CN.GB18030"
#SUPPORTED="zh_CN.GB18030:zh_CN:zh:en_US.UTF-8:en_US:en"
#SYSFONT="latarcyrheb-sun16"
#EOF
#set sysctl
true
>
/etc/sysctl
.conf
cat
>>
/etc/sysctl
.conf << EOF
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
net.ipv4.tcp_max_tw_buckets = 6000
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_wmem = 4096 16384 4194304
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
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.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.ip_local_port_range = 1024 65535
EOF
/sbin/sysctl
-p
echo
"sysctl set OK!!"
#close ctrl+alt+del
sed
-i
"s/ca::ctrlaltdel:\/sbin\/shutdown -t3 -r now/#ca::ctrlaltdel:\/sbin\/shutdown -t3 -r now/"
/etc/inittab
#set purview
chmod
600
/etc/passwd
chmod
600
/etc/shadow
chmod
600
/etc/group
chmod
600
/etc/gshadow
#disable ipv6
cat
<< EOF
+--------------------------------------------------------------+
| === Welcome to Disable IPV6 === |
+--------------------------------------------------------------+
EOF
echo
"alias net-pf-10 off"
>>
/etc/modprobe
.conf
echo
"alias ipv6 off"
>>
/etc/modprobe
.conf
/sbin/chkconfig
--level 35 ip6tables off
echo
"ipv6 is disabled!"
#disable selinux
sed
-i
'/SELINUX/s/enforcing/disabled/'
/etc/selinux/config
echo
"selinux is disabled,you must reboot!"
#vim
sed
-i
"8 s/^/alias vi='vim'/"
/root/
.bashrc
echo
'syntax on'
>
/root/
.vimrc
#zh_cn
sed
-i -e
's/^LANG=.*/LANG="en"/'
/etc/sysconfig/i18n
#init_ssh
ssh_cf=
"/etc/ssh/sshd_config"
sed
-i -e
'74 s/^/#/'
-i -e
'76 s/^/#/'
$ssh_cf
#sed -i "s/#Port 22/Port 65535/" $ssh_cf
sed
-i
"s/#UseDNS yes/UseDNS no/"
$ssh_cf
#client
sed
-i -e
'44 s/^/#/'
-i -e
'48 s/^/#/'
$ssh_cf
service sshd restart
echo
"ssh is init is ok.............."
#chkser
#tunoff services
#--------------------------------------------------------------------------------
cat
<< EOF
+--------------------------------------------------------------+
| === Welcome to Tunoff services === |
+--------------------------------------------------------------+
EOF
#---------------------------------------------------------------------------------
for
i
in
`
ls
/etc/rc3
.d
/S
*`
do
CURSRV=`
echo
$i|
cut
-c 15-`
echo
$CURSRV
case
$CURSRV
in
crond | irqbalance | microcode_ctl | network | random | sshd | syslog |
local
)
echo
"Base services, Skip!"
;;
*)
echo
"change $CURSRV to off"
chkconfig --level 235 $CURSRV off
service $CURSRV stop
;;
esac
done
echo
"service is init is ok.............."
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本文转自 抚琴煮酒 51CTO博客，原文链接：http://blog.51cto.com/yuhongchun/724103，如需转载请自行联系原作者
