CentOS includes content about administering, automating, and securing CentOS-based Linux systems in enterprise and lab environments. It covers installation, configuration, patching, monitoring, troubleshooting, hardening, and compatible tooling for servers, development platforms, and infrastructure workflows.
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CentOS FirewallD gives you a manageable way to control inbound and outbound network exposure without hand-editing low-level rules. This article explains how it works, how to choose zones …
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CentOS 8 SSH hardening is about reducing exposure without breaking remote administration. Learn which sshd controls matter, how they interact, and what to verify before production.
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SELinux is one of the most effective containment controls on CentOS 8, but only if it is enabled, configured correctly, and validated before production. This article explains what …
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SSH hardening on CentOS is most effective when you remove password authentication, enforce key-based access, and add Fail2ban to slow brute-force attempts. This article explains how the controls …
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CentOS 9 hardening starts with two high-value controls: locking down SSH and removing unused services from the attack surface. This article explains what to change, how to validate …
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When CentOS SELinux blocks a service that should work, the real challenge is separating policy denials from misconfiguration or legitimate security controls. This guide shows how to recognize …
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Key authentication is one of the most effective ways to harden SSH on CentOS 8, but only when it is implemented and validated correctly. This article explains the …
Tutorial
Configure SELinux policies on CentOS 8 by preparing the system, identifying denials, creating or adjusting policy rules, and validating the result before production use.