Article
How to Harden CentOS 7 with SELinux and Firewalld
CentOS 7 hardening is most effective when SELinux and Firewalld are treated as complementary controls. This article explains what each layer does, how they work together, what to …
VectraOps knowledge library
Knowledge library
Search practical articles, tutorials, checklists, troubleshooting guides and automation scripts.
Article
Article
CentOS SELinux Troubleshooting for Enforcing Mode Access Denials
When SELinux blocks a service in enforcing mode, the fastest safe fix is not to disable it but to identify the exact denial, confirm whether it is expected …
Article
CentOS 7 FirewallD Rules for Secure Service Exposure
CentOS 7 FirewallD rules determine which network services are reachable from which sources. This article explains how to expose services safely, validate zone behavior, and avoid the common …
Article
CentOS FirewallD Configuration for Secure Server Hardening
CentOS FirewallD is most effective when you treat it as a policy layer, not just a port-opening tool. This article explains how to design zones, verify service exposure, …
Article
Hardening CentOS 7 SSH with Key-Based Authentication and MFA
CentOS 7 SSH hardening is most effective when you replace password logins with key-based authentication and add MFA for privileged access. This article explains when the approach fits, …
Article
Configure SELinux Booleans on CentOS to Enforce Least Privilege
SELinux booleans let you adjust specific policy behavior without disabling enforcement. This article explains how they work, when to use them, and how to verify changes safely.
Article
CentOS SELinux Troubleshooting: Fix Denials and Enforcing Mode
SELinux denials can make a CentOS service look broken even when the daemon is healthy. This article explains how to confirm the denial, identify the real cause, apply …
Article
How to Secure CentOS SSH Access with Key-Based Authentication
Password-based SSH access is one of the most common entry points to harden on CentOS. This article explains how key-based authentication works, when to use it, what to …