一、编写脚本/root/bin/checkip.sh，每5分钟检查一次，如果发现通过ssh登录失败 次数超过10次，自动将此远程IP放入Tcp Wrapper的黑名单中予以禁止防问
vi /root/bin/checkip
#/bin/bash
IP=`cat /var/log/secure | grep 'Failed password' |awk '{print $(NF-3)}' |sort |uniq -c |awk '{print $2}'`
for i in $IP;do
FAILNUM=`cat /var/log/secure |grep 'Failed password' |awk '{print $(NF-3)}' |sort |uniq -c |grep $i |awk '{print $1}'`
if [ "$FAILNUM" -gt "10" ];then
grep "$i" /etc/hosts.deny >/dev/null 2>&1
if [ $? != 0 ];then
echo "sshd:$i" >> /etc/hosts.deny
fi
fi
done
crontab -e
* */5 * * * /root/bin/checkip
二、配置magedu用户的sudo权限，允许magedu用户拥有root权限
vi /etc/sudoers
## Allow root to run any commands anywhere
root ALL=(ALL) ALL
magedu ALL=(ALL) ALL
