DevOps
Every deploy produced a handful of 502s. Not many, never enough to trip an alert, and always dismissed as "the load balancer catching up". It was not the load balancer. It was our containers being killed mid request because nobody had written a signal handler. The window is
Docker
One changed byte early in a Dockerfile throws away everything after it. Here is how the cache key is computed and how to order instructions so it survives.
Docker
Your image builds on a Mac and dies in production. What the error means, how to check an image's architecture, and how to build multi arch properly.
Deep Dive
Traditional VMs take thirty seconds. Firecracker takes 125 milliseconds. The difference is everything it refuses to do.
Kubernetes
Exit code 137, a memory graph that looks perfectly healthy, and no application error. Here is why your monitoring missed it and how to find the real number.
Kubernetes
CrashLoopBackOff is not an error, it is a symptom with about nine distinct causes. Here is how to identify which one you have in under three minutes.
Docker
Non root containers break in predictable ways. Here is how UID mapping, volume ownership, and read only filesystems produce the same error.
Docker
Same Dockerfile, same repo, different result. The difference is nearly always cache, context, architecture, or something on your machine that is not in the image.
AI
If an agent can run shell commands, you have an arbitrary code execution problem. Here is what each isolation option genuinely protects against.
Networking
Your browser trusts the certificate and your application does not. They use different trust stores, and inside a container there may not be one at all.
Docker
Distroless and scratch images are great for security and miserable when something breaks. Here is how to investigate a container that ships nothing.
DevOps
A cache with the wrong key restores nothing and uploads everything. A cache with too broad a key restores stale artifacts. Both are common.