kubernetes

As someone who’s been playing with a lot of Kubernetes on bare metal lately, I’ve come to appreciate MetalLB (a load balancer implementation for bare metal). Nothing is worse than blindly pasting YAML into your terminal, then seeing Pending next to all your newly created services expecting cloud load balancers. MetalLB was the last thing I needed to make my tiny home lab cluster feel like a real cloud. When I was first configuring it, the hardest thing to wrap my head around was how traffic flowed in the different modes and traffic policies. I spent a lot of time reading docs and experimenting, so hopefully this post will help you understand the different modes and how they work with service traffic policies. ...

After many years of being on-call under my belt, I never thought I’d say I have a favorite alerting method. But that changed after watching one of Justin Garrison’s videos which had an excellent depiction of how Linux’s Out-of-Memory Killer works. I was no stranger to the OOM Killer visiting my Kubernetes clusters, so this gave me a dumb idea for a (perhaps) fun alerting mechanism: the OOM Bonker. ...

Over the past few months at Red Hat, I’ve been working with my team on streamlining our CI/CD process and migrating some of our applications into OpenShift. As we’ve been slowly moving apps, it’s been a great opportunity to revisit some of the basics of our architecture and look at ways we can better use OpenShift to . What may have worked well in a VM-based deployment doesn’t necessarily translate well into a container-based deployment. For the sake of this post, I’ll be showing how we use a recently stable feature of OpenShift (and Kubernetes) to deploy memcached for one of our Ruby apps on the Red Hat Customer Portal. ...

Over the past few months, I’ve been working with Kubernetes a lot as Ayetier has been making the shift towards container orchestration. As easy as it was to create and scale services, it was a bit frustrating to see how most reverse proxy solutions seemed kludgy at best. That’s why I was pretty intrigued when I first read about Traefik — a modern reverse proxy supporting dynamic configuration from several orchestration and service discovery backends, including Kubernetes. ...