Up and Running With Linkerd v1

Getting Linkerd 1 working on a small app in my Kubernetes cluster

vados

37 minute read

tl;dr - I got linkerd v1 working on a small 3-tier app on my k8s cluster. Linkerd v1 sports an older (but much more battle-tested) and simpler model in that it runs a proxy on every node as a DaemonSet. Linkerd v2 runs a set of control programs (the “control plane”) and per-application sidecar containers that act as proxies, and while that’s cool I’m not going to run it just yet.

Running Untrusted Workloads K8s Container Linux Part 3

Third and final part of my adventures and mistakes in trying to get untrusted workloads running on k8s (with container linux underneath)

49 minute read

tl;dr - After struggling through settting up containerd’s untrusted workload runtime, building a static kata-runtime and a neutered-but-static qemu-system-x86_64 to use, I succeeded in hooking up containerd to use kata-runtime only to fail @ the last step since the pods that were created ran qemu properly but couldn’t be communicated with and would immediately make k8s node they were running on move to the NotReady due to PLEG errors. I did a lot of work to partially succeed (if you…

Running Untrusted Workloads K8s Container Linux Part 2

Second part of my adventures and mistakes in trying to get untrusted workloads on k8s (with container linux underneath)

vados

6 minute read

tl;dr - I came across rkt’s ability to use alternate stage 1s, got it working, but then abandoned it due to problems getting rook running and a lack of CRI compatability (at the time), before even trying to compare with the QEMU-in-a-pod approach. These notes are very old (I don’t use container linux for my cluster anymore) and I can’t believe I quit so quickly without more thorough investigation but evidently I did so there’s not much to see in this post, but maybe it…

Running Untrusted Workloads K8s Container Linux Part 1

Adventures and mistakes in trying to get untrusted workloads on k8s (with container linux underneath)

vados

31 minute read

tl;dr - I kinda succeeded in getting simplistic VM level isolation working on a container linux powered Kubernetes cluster with lots of failures along the way. This post is cobbled-together notes from the exploration stage, which ultimately lead to an extremely hackish CoreOS VM powered by qemu running inside a privileged Kubernetes pod running on top of a CoreOS dedicated machine. The notes that were cobbled together to make this post are very old, I’ve actually already switched to Ubuntu…

Securing Your Kubernetes Cluster

Good resources I've stumbled upon discussing securing your Kubernetes cluster(s)

vados

8 minute read

tl;dr - Check out Kubernetes features like PodSecurityPolicy, NetworkPolicy. There are also Fantastic fun analogy-laden Talks from Kubecon 2017 (Austin) and Kubecon 2018 (Copenhagen). CIS standards for Kubernetes clusters exist. There are also companies like Aqua that produce tools like kube-bench that let you test your clusters CIS benchmarks. It’s also important to remember to secure the machine as well as the Kubernetes cluster – so the usual Unix server administration advice…

Even faster rust builds in Gitlab CI

Getting even faster builds out of rust on Gitlab CI

vados

9 minute read

tl;dr - I applied a few patterns I’ve used on other projects to a Gitlab CI-powered rust project to achieve <2min builds. Basically just caching at different layers – caching via the docker image builder pattern at the docker level, aggressive caching with Gitlab CI at the CI runner level, also one more step of combining some build steps (probably unnecessarily).

k8s Container Linux ignition with rkt and kube-router

Modifying a recently created Container Linux ignition configuration to use rkt and kube-router (instead of containerd and canal).

vados

7 minute read

I recently wrote a post about about switching back to container linux for my small Kubernetes cluster, in which I outlined everything i needed to do to get it up and running. Even more recently, I decided I wanted to go ahead and run “rktnetes” to try and take advantage of it’s annotation-powered stage1 selection, and figured I should post that up too for any fellow rkt enthusiasts!