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Server Hardening

Software & Package Management

1. Establishing a Patch Management Baseline Unpatched vulnerabilities in core software packages—such as the Linux kernel, OpenSSL, and glibc—represent the single highest risk vector for system exploitation after weak credentials. Maintaining a strict updates pipeline is non-negotiable for system security. On-Demand Security Patching When logging into a server for maintenance, your first step should always […]

May 2026
Rui Vaz

Mastering the Firewall: A Guide to nftables

If you’ve been managing Linux servers for a while, you’ve likely cross paths with iptables. For years, it was the undisputed king of Linux packet filtering. But times change, and so does the Linux kernel. Enter nftables, the modern successor designed to replace iptables, ip6tables, arptables, and ebtables with a single, unified framework. It brings […]

April 2026
Rui Vaz

Mastering File System Security

File system permissions are your first and last line of internal defense. Misconfigured ownership (chown) or overly loose permissions (chmod) can turn an otherwise hardened server into an open repository. This short guide establishes best practices for dynamic internal privilege controls.

April 2026
Rui Vaz

Infrastructure Edge Defense with UFW & Fail2ban

Target Audience: Systems Administrators, Network SecOpsReference Framework: NIST SP 800-123 Section 4.3 (Firewalls and Network Security Contols) Once administrative access vectors are hardened, the next critical phase of server lifecycle provisioning is locking down the network perimeter. This guide establishes a strict white-list network policy utilizing the Uncomplicated Firewall (UFW) and pairs it with Fail2ban […]

March 2026
Rui Vaz

Advanced SSH Hardening & Key Management

Target Audience: Systems Administrators & DevOps. Learn how to secure the primary administrative access vector on Linux servers by enforcing key-based authentication, altering default ports, and disabling root login.

February 2026
Rui Vaz

Hardening a Dedicated Server

Target Audience: Systems Administrators & Infrastructure Engineers. Before modifying a single configuration file on a fresh deployment, you must establish an operational baseline. Map out your server’s storage, active network footprint, and hardware specs using four universal commands compatible with Ubuntu, AlmaLinux, Rocky Linux, and Proxmox VE.

February 2026
Rui Vaz

Kernel Hardening via sysctl

Hardening the Linux kernel via sysctl is one of the most effective ways to establish a rock-solid edge defense. By tweaking runtime kernel parameters in /etc/sysctl.conf (or inside /etc/sysctl.d/), you can block common network attacks, prevent information leaks, and protect system memory from exploitation without needing to recompile the kernel. Here is a comprehensive production […]

January 2026
Rui Vaz