Rohit Bhadani

Networking

TLS Handshake Failures: Reading the Error the Server Actually Sent

handshake failure, protocol version, unknown ca and bad certificate all mean different things. Here is how to get the real reason out of a connection that dies in the first two packets.

MicroVMs

The Domain Resolved Everywhere Except Where I Was Sitting

A CNAME that dig confirmed, a browser that refused, and a certificate stuck on pending. Three separate caches pretending to be one problem.

MicroVMs

Your Database Got Slower and Nothing in Your Code Changed

Query times doubling at unpredictable hours with no deploy and no traffic spike. When the cause is not in your process, it is usually not on your machine either.

DevOps

Your systemd Service Will Not Start and the Logs Say Nothing Useful

status=203/EXEC, status=217/USER, and the other exit codes that mean something specific. Here is how to read them and what each one actually points at.

MicroVMs

The Test That Only Failed When It Ran Second

A suite that passed alone and failed in the pipeline. The bug was not in the test, it was in what the previous job left behind on the runner.

Networking

Cloudflare Error 526 and the Redirect Loop: Two Failures, One Setting

Flexible gives you an infinite redirect. Full strict gives you a 526. The documentation says Full or higher, and higher is the one that breaks.

Node.js

EMFILE: Too Many Open Files, and Why Raising the Limit Is Usually Wrong

The quick fix is raising ulimit. The real question is what is holding thousands of descriptors open and never closing them.

MicroVMs

I Rebooted the VM and the Kernel Did Not Change

A patched kernel that kept reporting the old version after every reboot. The reboot was working perfectly. My assumption about where the kernel comes from was wrong.

Opinion

Five Things I Was Confidently Wrong About

Positions I argued for, sometimes loudly, that turned out to be mistaken. What changed my mind in each case.

Shopify

Shopify Webhooks You Are Not Receiving

The webhook is registered, orders are being created, and nothing arrives. Here is where they go and how to stop being unsubscribed.

Shopify

The Shopify Theme Debugging Toolkit

You cannot attach a debugger to Liquid. Here is the set of techniques that actually works for finding out why a theme is doing something unexpected.

Shopify

Migrating a Shopify Store to Online Store 2.0 Without Breaking Everything

A practical migration order, the things that silently break, and how to verify you did not lose content along the way.