pam_tally2 command examples
pam_tally2 – The login counter (tallying) module
Add the following line to /etc/pam.d/login to lock the account after 4 failed logins. Root account will be locked as well. The accounts will be automatically unlocked after 20 minutes. The module does not have to be called in the account phase because the login calls pam_setcred correctly.
auth required pam_securetty.so auth required pam_tally2.so deny=4 even_deny_root unlock_time=1200 auth required pam_env.so auth required pam_unix.so auth required pam_nologin.so account required pam_unix.so password required pam_unix.so session required pam_limits.so session required pam_unix.so session required pam_lastlog.so nowtmp session optional pam_mail.so standard