防止vps上SSH被暴力破解密码

1、查看ssh被猜测密码的IP及次数

cat /var/log/secure | awk '/Failed/{print $(NF-3)}' | sort | uniq -c | awk '{print $2" = "$1;}'

2、创建脚步

vim /root/bin/denyhosts.sh

#!/bin/bash
cat /var/log/secure|awk '/Failed/{print $(NF-3)}'|sort|uniq -c|awk '{print $2"=" $1;}' >/root/bin/Denyhosts.txt
DEFINE="10"
for i in `cat /root/bin/Denyhosts.txt`
do
        IP=`echo $i|awk -F= '{print $1}'`
        NUM=`echo $i|awk -F= '{print $2}'`
        if [ $NUM -gt $DEFINE ]
        then
                grep $IP /etc/hosts.deny >/dev/null
                if [ $? -gt 0 ];
                then
                echo "sshd:$IP" >> /etc/hosts.deny
                fi
        fi
done

3、添加计划

vim /etc/crontab

添加一行（每天1点整运行，注意vps时区）

0 1 * * * sh /root/bin/Denyhosts.sh