I recently worked on prototyping a public DNS server using CoreDNS. CoreDNS normally provides serving DNS zone data through files, however it also allows you to proxy to a backend endpoint via gRPC. I used this DNS server as the nameserver for a domain with thousands of subdomains.

This approach allows you to write a custom DNS server  in any popular language, and serve records stored in an external datastore (like a redis cache, mysql database). In this article, I’ll go over the sample backend I’ve built. Read More →

Skaffold is my top Kubernetes developer tool of the year so far. Since its accidental reveal about 3 months ago, it already got 3,700 stars on GitHub. Clearly the community is lovin’ it. Read More →

If you are using Minikube or Docker for Mac/Windows to run your Kubernetes deployments locally, I have developed a tool to restart containers automatically when their images are rebuilt: Check out freshpod on GitHub! Read More →

How would you debug a Docker container that has no shell, no tools, but a single statically-compiled executable? Creating docker images FROM scratch is a trend on the rise, but is it really taking away our debugging capabilities? Read More →

Minikube is a great tool! Almost everybody begins Kubernetes with it and continues to use it all the time. I figured out a way to use single-node GKE clusters just like Minikube: Read More →

I gave a talk on Kubernetes Network Policies at KubeCon 2017 in Austin, TX last week. It was in a lecture format: I described how the feature works and how to configure network policies with some examples. Read More →

I run probably more than a hundred kubectl commands on some days, as you can tell I like to try out things. After a while I started to notice some patterns and realized I can pretty much condense 99% of all my kubectl usage into single-word bash aliases. Read More →

If I were to point out one reason why Kubernetes is taking off, I would probably say because of its awesome community. The second reason would be the flexibility of the Kubernetes API and how easy it is to write custom extensions or plugins on top of it. In this article, I’ll dig deep in a new concept: Initializers, which is a dynamic and pluggable way of modifying Kubernetes resources before they are actually created. Read More →