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  • Wed, Jul 19, 2023 by vados

    Building Custom Kernels for Kata Containers

    kata-containers enables Virtual Machine isolation on kubernetes, and this guide is for those who want custom kernels.

  • Mon, Aug 8, 2022 by vados

    Was Service Catalog Redundant After All?

    Service catalog seems to have quietly left the room. Gone but not forgotten, all aboard the operator hype train.

  • Mon, May 16, 2022 by vados

    Installing Fluent Bit and Loki for lightweight logs

    How to install Loki & Fluent Bit for lightweight monitoring across your k8s cluster.

  • Sun, May 1, 2022 by vados

    A script for copying PVC data across StorageClassses

    A small, painfully procedural and script for copying data from one PVC to another across StorageClasses.

  • Mon, Apr 25, 2022 by vados

    cert-manager moved from Bazel to Make

    cert-manager, one of the most important operators in the k8s ecosystem, just moved from Bazel to Make, and that's awesome. In case it wasn't clear, I'm biased in favor of Makefiles.

  • Thu, Feb 24, 2022 by vados

    Upgrading a k0s cluster in-place from single-master to HA

    How I (painfully) upgraded a running k0s cluster from single-master to HA master. In the end I think a single well-equipped master was actually quite stable and better, but the lure of 'web scale' was too strong. Also, if you're thinking of attempting this, just start a new cluster.

  • Sun, Jan 23, 2022 by vados

    Starting 2022 with a Bang: Ceph on ZFS

    I'm starting off 2022 in classic yak shaver style; with something I'm not supposed to be doing for tenuous financial gain -- running Ceph on ZFS.

  • Sat, Dec 18, 2021 by vados

    Everything I've seen on optimizing Postgres on ZFS

    Looking to run Postgres on ZFS? I've gathered some of the information and sage advice out there to give you a head start on figuring out how to do it safely and efficiently.

  • Sat, Dec 18, 2021 by vados

    New node who dis? DNS Issues and Calico Failures on a resurrected Node

    A while back, I had a somewhat soft node failure due to Calico not allowing the same node to come up under a different IP address.

  • Thu, Oct 14, 2021 by vados

    Bare metal k8s storage: OpenEBS ZFS LocalPV + Rancher Longhorn

    I recently reworked my storage setup in pursuit of both production and flexibility. Looking at the F/OSS space led me to OpenEBS ZFS LocalPV with Longhorn on top, and here's why.

  • Sat, Sep 11, 2021 by vados

    Automating k0s cluster backup with Ansible and SystemD

    A quick and simple guide to automating your k0s cluster backup with ansible and systemd. You can probably guess the code you're about to read.

  • Sun, Sep 5, 2021 by vados

    Sometimes the problem is DNS (on Hetzner)

    If you're running on Hetzner, you might want to update your DNS settings to use some other resolvers. This can problem can manifest if you're trying to resolve DNS names that resolve to your own machines *from inside your own machines*.

  • Fri, Aug 27, 2021 by vados

    So you need to wait for some Kubernetes resources?

    Want to wait for some Kubernetes resources and don't want to write a full reconciliation loop/operator? Here's how to hack it.

  • Fri, Jul 16, 2021 by vados

    Level 1 Automated K8S Deployments With GitLab CI

    You may not need Flux/ArgoCD or any fancy automated reconciliation loop deployment process just yet! Plain old CI runners work quite well for simple automated deployments (this approach powers this blog right now!).

  • Sun, May 9, 2021 by vados

    Stuffing both SSH and HTTPS on port 443 with stunnel, sslh, and Traefik

    A small exploration and guide (with repo) into exposing SSH to a container in a Pod over port 443 (which is normally used for HTTPS).

  • Tue, Apr 13, 2021 by vados

    K8s storage provider benchmarks round 2, part 5

    I finish up the benchmarking process, and share the results. If you want to find what I actually end up using, the answer is in here!

  • Mon, Apr 12, 2021 by vados

    K8s storage provider benchmarks round 2, part 4

    I describe in detail the YAML and Makefile scripts that power the fio and pgbench based tests that will run on every storage provider I managed to set up

  • Tue, Apr 6, 2021 by vados

    K8s storage provider benchmarks round 2, part 3

    I install even more storage providers -- this time OpenEBS cStor, Jiva, LocalPV hostPath, LocalPV ZFS and LINSTOR

  • Tue, Apr 6, 2021 by vados

    K8s storage provider benchmarks round 2, part 2

    I start installing storage plugins, this time Rook (Ceph) -- which takes a while -- and OpenEBS Mayastor. Read this if you want to read a feel-good underdog system administration story.

  • Sun, Mar 28, 2021 by vados

    K8s storage provider benchmarks round 2, part 1

    Part 1 of my second crack at benchmarking storage providers that scale from hobbyist to enterprise. In this post I go over the setup (the code isn't public just yet) of the dedicated servers I'll be using

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