DeployOS runs my own infrastructure - 4 production servers, 11 live apps, every day. Not a demo VPS with one throwaway app I spin up to record a screen capture. That distinction turned out to matter more than I expected, because a demo environment can't produce the bugs that only show up when servers have real history: apps adopted from a previous tool, non-default build methods someone configured six months ago and forgot about, edge cases that only exist because a server has been running long enough to accumulate them.
Here are three real bugs that testing against my own fleet found - and fixed - before they could hit anyone else.
1. Routes silently pointing nowhere on adopted servers
When DeployOS adopts an app that was already running (imported from Coolify, Portainer, or a hand-rolled Compose setup), it has to figure out the app's real container port by inspecting what's actually running, since adoption can't know that in advance the way a fresh deploy does. On most of my apps this worked fine. On one, the port DeployOS inferred during adoption was correct at the moment of adoption, but a later redeploy changed which port the container actually listened on - and the route didn't re-resolve. The app was up. Its containers were healthy. The proxy was sending traffic to a port nothing was listening on anymore.
This is the kind of failure that's invisible in a demo (deploy once, take a screenshot, done) and only shows up when an app has a real deploy history. The fix makes route resolution re-check the actual listening port on every deploy, not just trust what adoption originally found.
2. Scale and restart silently no-op'ing on non-default build methods
Most of my apps build from a Dockerfile. A couple use Railpack (auto-detected builds, no Dockerfile needed) and one uses a raw docker-compose.yml I wrote by hand for a multi-service stack. Restart and scale operations assumed the standard single-container shape closely enough that against the compose-based app, they silently did nothing - no error, just no effect. The app didn't restart. The replica count didn't change. And nothing told me that.
A silent no-op is worse than a loud failure, because a loud failure gets investigated immediately and a silent one gets discovered whenever you happen to notice the thing you asked for didn't happen. This is exactly the kind of bug that only exists once you have apps built three different ways sitting on real infrastructure, not five identical demo containers.
3. A crash that could brick the app after a single panic
This one was the scariest of the three. Under a specific combination of state I only hit because one of my servers had been running long enough to reach it, a background task could panic - and depending on timing, that panic could leave the app in a state where it wouldn't recover on the next launch without manual intervention. One crash, self-inflicted lockout.
This is now caught by a panic hook that writes a local crash report and lets the app come back up cleanly instead of staying wedged - the same crash-report mechanism you'd see if DeployOS ever closes unexpectedly on your machine. But the bug only existed to be found because something had been running for real, against real state, for real time.
Why this is the whole point of dogfooding
None of these three bugs are exotic. They're the ordinary, unglamorous kind that only show up when software meets the actual mess of running infrastructure: mixed build methods, adopted history, long uptimes. A test suite catches what you thought to test for. Running the thing on your own production servers, every day, catches what you didn't think to test for - which is usually the more dangerous half.
I'd rather find these against my own 11 apps than your one.