GitHub Actions secrets are unavailable in fork pull requests, and your workflow fails silently on CI. Here’s why it happens and how to fix it without exposing credentials to untrusted fork code. The symptom: your GitHub Actions workflow passes on every branch push. A contributor opens a PR from their fork, and suddenly every step … Read more
The deploy was routine. A rails db:migrate in the maintenance window, adding a last_login_at column to the users table — 4.2 million rows, nothing alarming. The migration ran for 3 seconds. But for those 3 seconds, every query touching users queued behind it. By the time the lock released, the queue had grown to 400 … Read more
Docker Compose depends_on Does Not Wait for the Database to Be Ready: How to Fix It Your app boots, immediately tries to connect to the database, and crashes — even though you have depends_on in your docker-compose.yml. The database logs show it started, your web container logs show a connection refused error. Welcome to the … Read more
Server reboots should be routine. Instead, you’re watching your Node.js app fail to come back up, pm2 showing an empty process list, and users hitting 502s while you scramble to SSH in and manually restart everything. The frustrating part: you ran pm2 startup and pm2 save exactly as the docs say. So why does rebooting … Read more
You paste the token into jwt.io. It decodes fine. The payload is correct, the signature validates, the expiration is two hours from now. You send the request to your FastAPI endpoint. It returns 401. Every single time. I spent three hours on this last week. Here is what was actually wrong and how I traced … Read more
Every time I hit git stash pop and see this, a small knot forms in my stomach: CONFLICT (content): Merge conflict in src/api/handler.py The stash entry is kept in case you need it again. The good news buried in that second line: your changes are safe. git stash pop conflict leaves the stash entry alive … Read more
You run pnpm install in your monorepo. Everything installs cleanly. You start your dev server and immediately hit a wall: Error: Cannot find module ‘@mycompany/utils’ The package exists. You can see it in your packages/ directory. You can see it listed in the consuming package’s package.json. pnpm installed without errors. And yet the module doesn’t … Read more
The upgrade from Pydantic v1 to v2 breaks things silently. Not always at import time — often at runtime, when your API response has subtly different output, your cache key no longer matches, or your HMAC signature validation starts failing on every request. The root cause, in most cases, is that .dict() and .json() were … Read more
process.env.MY_API_KEY is undefined in production. You checked the Vercel dashboard — the variable is definitely there. You redeployed. Still undefined. Here’s what was actually wrong: there are three completely separate reasons this happens, and they stack. This post walks through each one in the order you should check them, with the exact commands to confirm … Read more
A 502 Bad Gateway from nginx almost always means the same thing: nginx is running fine, your request reached it, but nginx couldn’t get a valid response from the upstream server — in this case, your Node.js application. The connection between nginx and Node.js broke down somewhere. This error is distinct from a 503 (upstream … Read more