Understanding Bastion Hosts: The Quite Gatekeepers of Modern Infrastructure

There is a moment every developer reaches, usually late at night, when something breaks and you realize you no longer understand your own setup. At first, it feels manageable. One VPS, one IP address, one SSH command. You memorize it. You trust it. You build on top of it. Then comes the second server. And the third. Suddenly you are juggling keys, IPs, environments, and access rules. You forget which key belongs to which machine. You paste commands from old terminal history hoping they still wor