SSH Security Best Practices: From Authentication to Tunneling
Overview SSH (Secure Shell) is the core channel for Linux operations and a primary target for attackers. A misconfigured SSH service can lead to a full server compromise. This article covers SSH security best practices comprehensively — from authentication mechanisms, server-side hardening, bastion host architecture, and tunneling techniques to audit logging and brute-force protection. Key-Based Authentication Generating Key Pairs # Generate Ed25519 key (recommended) $ ssh-keygen -t ed25519 -C "admin@sre.wang" -f ~/....