实验结果：

[root@desktop1 ~]# ssh student@server1

Password:

Password:

Password:

Permission denied (publickey,gssapi-keyex,gssapi-with-mic,keyboard-interactive).

[root@desktop1 ~]# ssh student@server1

Account locked due to 4 failed logins

设置：

[root@server1 ~]# cat /etc/pam.d/password-auth

auth        required      pam_tally2.so deny=3 unlock_time=180

account     required      pam_tally2.so

[root@server1 ~]# cat /etc/pam.d/system-auth

auth    required  pam_tally2.so deny=3 unlock_time=180

account    required  pam_tally2.so