根据这篇博文的优化介绍：http://lizhenliang.blog.51cto.com/7876557/1349879
简单写了一键执行脚本，对批量部署很有帮助，脚本内容执行顺序如下：
1、关闭Selinux
2、清空防火墙并设置基本规则
3、添加user用户并进行Sudo授权管理（根据需求添加自己的用户）
4、禁用Root远程登录
5、禁用不使用的自启动服务
6、删除不使用的系统用户
7、关闭重启组合键（ctl-alt-delete）
8、调整文件描述符大小
9、修改系统显示信息
10、修改历史记录
11、同步系统时间
12、内核参数优化
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[root@localhost ~]
# vi optimizing.sh
#!/bin/bash
cat
<< EOF
+---------------------------------------+
| Start Optimize ...... |
+---------------------------------------+
EOF
########## Shut selinux ##########
sed
-i
"s/SELINUX=enforcing/SELINUX=disabled/g"
/etc/selinux/config
echo
"Shut selinux. [ OK ]"
########## Set firewall ##########
/sbin/iptables
-F
/sbin/iptables
-I INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
/sbin/iptables
-A INPUT -p tcp --dport 80 -j ACCEPT
/sbin/iptables
-A INPUT -p tcp --dport 22 -j ACCEPT
/sbin/iptables
-A INPUT -p tcp --dport 53 -j ACCEPT
/sbin/iptables
-A INPUT -p udp --dport 53 -j ACCEPT
/sbin/iptables
-A INPUT -p udp --dport 123 -j ACCEPT
/sbin/iptables
-A INPUT -p icmp -j ACCEPT
/sbin/iptables
-P INPUT DROP
/etc/init
.d
/iptables
save >
/dev/null
2>&1
echo
"Set firewall. [ OK ]"
########## Auth and add user ##########
/usr/sbin/useradd
user >
/dev/null
2>&1
#添加user用户并设置密码123.com
if
[[ $? -
eq
0 ]];
then
echo
"123.com"
|
passwd
--stdin user >
/dev/null
2>&1
sed
-i
"99 s/^/user ALL=(ALL) ALL/"
/etc/sudoers
echo
"Auth and add user. [ OK ]"
else
echo
"User already exist! [Fail]"
fi
########## Shut root login ##########
sed
-i
"s/#PermitRootLogin yes/PermitRootLogin no/g"
/etc/ssh/sshd_config
sed
-i
"s/#PermitEmptyPasswords no/PermitEmptyPasswords no/g"
/etc/ssh/sshd_config
sed
-i
"s/#UseDNS yes/UseDNS no/g"
/etc/ssh/sshd_config
echo
"Shut root login. [ OK ]"
########## Forbidden not use service ##########
/sbin/chkconfig
auditd off
/sbin/chkconfig
blk-availability off
/sbin/chkconfig
ip6tables off
/sbin/chkconfig
lvm2-monitor off
/sbin/chkconfig
netfs off
/sbin/chkconfig
udev-post off
echo
"Forbidden not use service. [ OK ]"
########## Delete not use user ##########
/usr/sbin/userdel
adm >
/dev/null
2>&1
/usr/sbin/userdel
lp >
/dev/null
2>&1
/usr/sbin/userdel
shutdown
>
/dev/null
2>&1
/usr/sbin/userdel
halt >
/dev/null
2>&1
/usr/sbin/userdel
uucp >
/dev/null
2>&1
/usr/sbin/userdel
operator >
/dev/null
2>&1
/usr/sbin/userdel
games >
/dev/null
2>&1
/usr/sbin/userdel
gopher >
/dev/null
2>&1
if
[[ $? -
eq
0 ]];
then
echo
"Delete not use service. [ OK ]"
else
echo
"Not use user already deleted! [Fail]"
fi
########## Shut reboot combination key ##########
sed
-i
's#exec /sbin/shutdown -r now#\#exec /sbin/shutdown -r now#'
/etc/init/control-alt-delete
.conf
echo
"Shut reboot combination key. [ OK ]"
########## Modify file descriptor size ##########
echo
"* soft nofile 102400"
>>
/etc/security/limits
.conf
echo
"* hard nofile 102400"
>>
/etc/security/limits
.conf
echo
"Modify file descriptor size. [ OK ]"
########## Modify system show message ##########
echo
"Welcome to Server."
>
/etc/issue
echo
"Welcome to Server."
>
/etc/redhat-release
echo
"Modify system show message. [ OK ]"
########## Modify history ##########
sed
-i
"s/HISTSIZE=1000/HISTSIZE=10/g"
/etc/profile
source
/etc/profile
echo
"Modify history. [ OK ]"
########## Sync timezone ##########
yum
install
ntp -y >
/dev/null
2>&1
cp
-rf
/usr/share/zoneinfo/Asia/Shanghai
/etc/localtime
/usr/sbin/ntpdate
cn.pool.ntp.org >
/dev/null
2>&1
/sbin/hwclock
-w
echo
"0 * * * * /usr/sbin/ntpdate cn.pool.ntp.org ; hwclock -w"
>>
/etc/crontab
echo
"Sync timezone. [ OK ]"
########## Kernel optimize ##########
cat
>>
/etc/sysctl
.conf << EOF
net.ipv4.tcp_fin_timeout = 2
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.ip_local_port_range = 4096 65000
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_max_syn_backlog = 4096
net.core.netdev_max_backlog = 10240
net.core.somaxconn = 2048
net.core.wmem_default = 4096000
net.core.rmem_default = 4096000
net.core.rmem_max = 4096000
net.core.wmem_max = 4096000
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_mem = 94500000 915000000 927000000
EOF
echo
"Kernel optimize. [ OK ]"
cat
<< EOF
+---------------------------------------+
| Optimize the end ...... |
| Please reboot your system ! |
+---------------------------------------+
EOF
|
本文转自 李振良OK 51CTO博客，原文链接：http://blog.51cto.com/lizhenliang/1349879，如需转载请自行联系原作者
