Linux Security

We tested 8 VPNs on Debian, Arch, and RHEL. Here are the best Linux VPNs for 2025 with real CLI setups, WireGuard configs, and kill switch verification.

Step-by-step SSH server hardening for sysadmins: disable root login, enforce key auth, configure AllowUsers, set up Fail2ban, and audit with ssh-audit.

Set up SSH key authentication on Linux in 2026. Real commands, Ed25519 keys, authorized_keys hardening, and sshd_config tuning for sysadmins.

A practical Linux server security checklist for sysadmins: SSH hardening, firewall rules, audit tools, and patch management with real commands.

OpenVPN vs WireGuard compared for sysadmins: speed benchmarks, codebase size, kernel integration, and which protocol wins for specific workloads.

Set up a WireGuard or OpenVPN server on Linux in 2026. Real commands, configs, and hardening steps for sysadmins and DevOps engineers.

Configure WireGuard VPN on Linux in under 15 minutes. Real commands for Ubuntu, Debian, and RHEL. Covers keys, peers, routing, and persistent tunnels.

Set up Fail2ban on Linux in 2026: real config examples, custom jails, SSH hardening, and tuning tips for sysadmins. Tested on Ubuntu 24.04 and RHEL 9.

Install and configure Certbot with Let's Encrypt on Nginx in 2026. Real commands, automation, renewal, wildcard certs, and troubleshooting for sysadmins.

Configure SSL/TLS on Nginx with real commands, cipher tuning, OCSP stapling, and A+ ratings. Step-by-step for sysadmins in 2026.

Top CLI password managers for Linux sysadmins in 2025. Real commands, GPG setup, team sync, and a direct recommendation for DevOps workflows.

Master iptables on Linux: real commands, chain logic, NAT, stateful rules, and persistence. Tested on Debian 12 and RHEL 9. No fluff, just working configs.

Audit a Linux server with real commands: user accounts, open ports, SUID files, cron jobs, kernel params, and log review. Step-by-step for sysadmins.

Master iptables rules and chains on Linux. Real commands, tested configs, and packet flow diagrams for sysadmins managing firewall policy in 2026.

NordVPN and four other VPNs tested on Linux CLI, split tunneling, and API access. Real benchmarks for sysadmins and DevOps engineers.

Master SSH local, remote, and dynamic tunneling on Linux. Real commands, sshd configs, and use cases for sysadmins and DevOps engineers.

The 10 best Linux security tools in 2025, tested by sysadmins: real commands, version numbers, benchmark data, and direct recommendations.

Set up 2FA on Linux with Google Authenticator PAM or TOTP. Real commands, SSH config, sudo hardening, and tested edge cases for production servers.

GPG encryption on Linux from key generation to automated signing pipelines. Real commands, real configs, tested on GnuPG 2.4.x in 2026.

Run AI tools locally on Linux with zero data leakage. Ollama, llama.cpp, and Open WebUI setup with network isolation, auditd, and real config examples.

Set up WireGuard VPN on Linux in under 20 minutes. Real commands, kernel config, peer management, and hardening for sysadmins and DevOps teams.

Set up LUKS disk encryption on Linux from scratch. Real commands for cryptsetup 2.x, keyfiles, LUKS2 headers, and automated unlocking in production.

Find, read, and analyze Linux logs with real commands. Covers journald, rsyslog, logrotate, and grep patterns for sysadmins and DevOps engineers.

Set up real intrusion detection on Linux with AIDE, Suricata, and auditd. Practical commands, configs, and alert tuning for sysadmins in 2026.

AppArmor vs SELinux compared on policy complexity, distro support, container security, and real-world enforcement. We tested both on Ubuntu 24.04 and RHEL 9.

The 8 best Linux security audit tools tested by sysadmins: Lynis, OpenSCAP, Trivy, Falco, and more. Real commands, real output, direct recommendations.

Go beyond default Fail2ban setup: custom jails, regex filters, multi-port bans, recidive jail, and action scripts tested on Ubuntu 24.04 and RHEL 9.

OSSEC vs Wazuh compared on architecture, rules, scalability, and ops cost. Real configs, benchmarks, and a direct recommendation for sysadmins.

Install and configure Snort 3 IDS on Linux in 2026. Real commands, rule tuning, pflog integration, and performance benchmarks from our test server.