Jul 12, 2025 · Information Security

How to Enforce Password Expiration and Complexity on Linux Systems

Learn how to configure password aging and enforce complexity rules on Linux by editing /etc/login.defs and /etc/pam.d/system-auth, including setting maximum password age, minimum length, character class requirements, and preventing reuse of recent passwords, with practical sed commands and example configurations for CentOS 6 and 7.

Password ComplexityPassword policySecurity

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How to Enforce Password Expiration and Complexity on Linux Systems

MaGe Linux Operations

Dec 5, 2024 · Information Security

How to Configure Linux Password Expiration and Complexity Rules

This guide explains how to set password aging limits in /etc/login.defs, modify them with sed, and enforce password complexity on CentOS systems using PAM modules such as pam_cracklib and pam_pwquality, including recommended values and practical examples.

LinuxPassword ComplexityPassword policy

0 likes · 9 min read

How to Configure Linux Password Expiration and Complexity Rules