centos查看尝试登录服务器的ip,一般用来查看攻击ip来源:

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

ubuntu查看尝试登录服务器的ip,一般用来查看攻击ip来源:

grep "Failed password for root" /var/log/auth.log | awk '{print $11}' | sort | uniq -c | sort -nr | more

然后将以上ip加入/etc/hosts.deny文件,格式:all:114.115.116.117