SSH Certificate-Based Authentication for Infrastructure Access (Complete Guide)
Replace static SSH keys with short-lived certificates: set up a signing CA, sign user keys, configure sshd trust,…
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Secrets Scanning in Git Repositories with Gitleaks (Complete Guide)
Catch leaked credentials in Git repos with gitleaks: scan current state and full history, block commits with a…
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HashiCorp Vault Basics: Secrets Management on Linux (Complete Guide)
Set up HashiCorp Vault on Linux for centralized secrets management: initialize and unseal, enable a KV secrets engine,…
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SELinux and AppArmor Basics: Understanding Enforcing Mode (Complete Guide)
Understand SELinux and AppArmor without disabling them: check status, read contexts, diagnose denials, and fix the actual policy…
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Proxmox Host Security Hardening Checklist (Complete Guide)
Harden a Proxmox VE host: SSH key-only access, firewall defaults, fail2ban for the web UI, patching cadence, permission…
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Proxmox Two-Factor Authentication (TOTP) Setup (Complete Guide)
Enable TOTP two-factor authentication on Proxmox VE: set it up per user, enforce it cluster-wide for admins, and…
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sudo and visudo: Configuring sudoers Safely (Complete Guide)
Configure Linux sudo access safely with visudo: grant full or limited privileges, use NOPASSWD for automation, organize with…
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Fail2ban Ban Report Shell Script for Linux (Daily Summary)
Generate a daily Fail2ban ban report on Linux. List banned IPs per jail, top attackers, and email summary…
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Harden OpenSSH on Linux Servers (Secure sshd_config)
Harden OpenSSH on Linux: disable root login, use key-only auth, change port, and limit users with sshd_config.
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Linux System Update Checker Shell Script with Email Notification
Check for available Linux system updates with a Bash script. Email notification for pending security patches.
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