vi /etc/pam.d/system-auth
添加
auth required pam_tally2.so deny=3 unlock_time=30 even_deny_root root_unlock_time=60
vim /etc/pam.d/sshd
添加
auth required pam_tally2.so deny=3 unlock_time=30 even_deny_root root_unlock_time=60
原文：https://www.cnblogs.com/jiqing9006/p/14735552.html