ssh防暴力破解

查看多次登录失败IP

# grep "Failed password for root" /var/log/auth.log | awk '{print $11}' | sort | uniq -c | sort -nr | grep -v ";"  
lastb | awk '{ print $3}' | sort | uniq -c | sort -n

更改ssh端口

设置强密码

使用denyhosts