K8s on Miek Gieben

DNS with K3s and systemk

Mon, 18 Jan 2021 09:38:37 +0000

In a DNS zone that I had laying around, I’ve come with the following scheme to have a working DNS with systemk. Note this does not deal with the control plane, those are routed via tailscale and I’m using IP addresses there. If naming is required here, it can be fitted in the scheme as well.

Using example.org as the domain here.

Scheme

An m “subdomain” (it’s not delegated) holds all the names and IP address of the machines of interest.

Provisioning K3s and systemk

Sun, 17 Jan 2021 10:38:37 +0000

Due to a previous job I’m calling nodes, “machines”, also because this is about systemk, it’s more likely you are actually using a real machine. So I’ll keep on using “machines” in this post.

First up: I needed an easy way to build packages of the software I’m using. For this I’ve setup a small CI using GitHub workflows that builds Debian packages for me: https://github.com/miekg/debian. (A Debian package repository would even be better, so I can more easily do upgrades).

Kubernetes Control Plane for Debian?

Thu, 12 Nov 2020 07:38:37 +0000

The everything is a object in Kubernetes is a very nice abstraction. The ability to influence it with just kubectl makes for only one control plane (to learn).

The networking, ingress, discovery, installation, etc. are all not that great. So I’m pondering marrying the things I love: have a plain Debian system, “normal” networking (no overlay/underlay/whatever), Debian packages, etc. And controlling it all via kubectl.

This should include a sane installation and allow for rollbacks. Metrics and observability should be supported, but will probably be more of the same (install the binaries and push configuration = k8s objects).

Running CoreDNS as a Forwarder in Kubernetes

Sat, 13 Jan 2018 10:38:37 +0000

This post details how I got CoreDNS running as a forwarder in a Kubernetes cluster. There were several problems that stood in the way of this goal:

Having (and building) a cluster out of Raspberry PIs.
Making load balancing possible in a non-cloud environment.
- See https://github.com/google/metallb.
Extending CoreDNS with a plugin that could communicate with 9.9.9.9 using DNS-over-TLS.
- See https://github.com/coredns/forward.
Building arm docker containers on amd64.
- See https://github.com/miekg/dxbuild.
Having a (simple) CI system to build (Docker) images and version the k8s manifests.
- No published repository, see various gists referenced in this document.

Cluster

I bought 4 PIs, some nice Corkea cases, an Anker USB power supply and power- and network cables. Then it is just a matter if putting everything together and building the cluster.