My production server went down and I didn't even notice

𝗠𝘆 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝘀𝗲𝗿𝘃𝗲𝗿 𝘄𝗲𝗻𝘁 𝗱𝗼𝘄𝗻 𝗮𝗻𝗱 𝗜 𝗱𝗶𝗱𝗻'𝘁 𝗲𝘃𝗲𝗻 𝗻𝗼𝘁𝗶𝗰𝗲 🚀

A production instance died at 19:21 UTC. Nobody called me, no panic alarm went off, I didn't lose the night. 😅

When I went to check, 𝗔𝗪𝗦 had already done the work for me: the 𝗔𝘂𝘁𝗼 𝗦𝗰𝗮𝗹𝗶𝗻𝗴 𝗚𝗿𝗼𝘂𝗽 detected that the physical host had failed — the System and Instance status checks fell together, the classic signature of an AWS hardware problem and not mine — and within minutes it had already launched a new instance to replace it. 💪

That's 𝘀𝗲𝗹𝗳-𝗵𝗲𝗮𝗹𝗶𝗻𝗴: the infrastructure heals itself.

But here comes what I 𝗿𝗲𝗮𝗹𝗹𝘆 learned 👇

The ASG replaced the machine flawlessly… but the 𝗯𝗼𝗼𝘁𝘀𝘁𝗿𝗮𝗽 of the new instance wasn't ready to come up 100% on its own. The real weak point was never the crash — that's exactly why the ASG exists. The weak point was my startup script. 💻

The lesson: 𝗵𝗶𝗴𝗵 𝗮𝘃𝗮𝗶𝗹𝗮𝗯𝗶𝗹𝗶𝘁𝘆 is not just replacing what breaks. It's making sure the new thing comes up whole, on its own, without you having to touch anything at 3am. 🔥

Have you ever tried taking down an instance on purpose to see if your infra recovers on its own?

Keep flying, Champions! ✈️