CenOS6.5安全加固及性能优化(脚本)

简介: CenOS6.5安全加固及性能优化(脚本)

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

[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

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