The Katz Experiments

Experimenting mcp-go, AnythingLLM and local LLM executions

Mon, 21 Apr 2025 16:16:00 -0300

Experimenting with MCP-Go, AnythingLLM and local executions

NOTE: I am no LLM, AI or whatever expert. Far from this. I have decided to write this blog post mostly as a way to track my progress and share my findings! There may be some mistakes here, please let me know!

I got hyped into the MCP trend. Usually I wait a bit more to get engaged into these subjects, but when it comes to cool integration between tools, I get excited to experiment fast.

Implementing a CAPI IPAM Provider

Wed, 21 Feb 2024 16:30:00 -0300

Implementing a CAPI IPAM Provider

One of the oldest problems of Cluster API and Kubernetes cluster creation is managing the Nodes IPs.

While it is possible to rely on DHCP for the node IP allocation, and some other cloud providers have their own way of managing the IPs, for some enterprises and onpremises environments the dynamic IP approach doesn’t applies, and there’s a need for a more strict control on “who is using what IP”.

NGINX NJS Experiments - Dynamic Backends

Sun, 12 Sep 2021 23:00:00 -0300

NGINX NJS and the dynamic config

Recently, due to some bugs in Ingress NGINX I have decided to look into alternatives on the dynamic upstream configuration.

For those not familiar with Ingress NGINX dynamic configuration, it relies massively on Lua and Openresty components to allow the reconfiguration of backends without restarting NGINX process, for example.

More and more features have been added to the Lua/openresty side of Ingress due to how “easy” it is to implement, for example different load balancing alghorithms, canary balancing and even global rate limit. I’m pretty null at Lua coding, but other Ingress NGINX maintainers have been doing that pretty well!

Using Falco to monitor outbound traffic for Pods in Kubernetes

Fri, 16 Apr 2021 16:32:27 -0300

Using Falco to monitor outbound traffic for Pods in Kubernetes

Falco is an opensource project from Sysdig focused on container runtime and cloud native security, that uses modern technologies like eBPF to monitor environment situations using syscalls and other events sources

We’ve used Falco some time ago as a PoC to monitor some specific events, and recently I’ve started to mess with it a bit to help contributing on it as a request from the amazing Dan Pop and also to understand better how Falco could help me in future situations.

Kubernetes Control Plane natively on FreeBSD with K3s

Wed, 30 Dec 2020 17:55:19 -0300

Introduction

I’ve been trying, on the past few days make Kubernetes usable on FreeBSD. Why? Some would say I like to suffer. Others would say I have much spare time.

To be honest, I’m doing this for fun. FreeBSD, for me, is one of the most stable and performant Operating Systems, and it’s sad that we cannot use it to run Kubernetes components (yet).

In a near future, me and Karen Bruner are planning to make not only the control plane usable, but also to use one of the precedents of containers on modern operating systems, even before Docker: Jails as a “container runtime”.

The mix (and mess) of Packet Filter in Linux Part 2 - eBPF + XDP

Sun, 01 Nov 2020 22:45:19 -0300

Introduction

In the first part of this article, I’ve shown the most common (so far) methods of doing packet filtering in Linux.

This part of the article is all dedicated to cover a brief introduction of eBPF and XDP, being used to packet filtering. I’ll not cover the usage of eBPF to monitor resources and performance, but there’s plenty of materials available and I’ll put some at the end of this article.

The mix (and mess) of Packet Filter Linux - Part 1

Sun, 13 Sep 2020 22:13:56 -0300

Introduction

So you’ve got a brand new Linux distribution. You start your Kubernetes distributions, and decide for a specific CNI that provides network policies.

Then you figure out that something is (or is not) working, does an iptables -L to check what is going on and boom: where are all my iptables rules? Worst of all, you put some newer rules but they seem not to work and your traffic is still being blocked.

Flatcar Linux in VMware Player — 5 minute command line deploy

Sun, 13 Sep 2020 20:28:50 -0300

So I needed to create a new Kubernetes Lab. Back in time, I’ve created a shell script to deploy a lot of CoreOS servers to my VMware Player, but I hadn’t touched that script since that time.

With the deprecation of CoreOS and the glorious rise of Flatcar Linux to save us, and while needing to test some stuffs in Calico, it came to my mind ‘why not write how to quick deploy a Flatcar Linux VM in VMware Player without scripts?’. So here we go.