How do I lock out a user after a set number of login attempts?

The PAM (Pluggable Authentication Module) module pam_tally keeps track of unsuccessful login attempts then disables user accounts when a preset limit is reached. This is often referred to as account lockout. To lock out a user after 4 attempts, two entries need to be added in the /etc/pam.d/system-auth file: auth required /lib/security/$ISA/pam_tally.so onerr=fail no_magic_rootaccount required [...]

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