Networking - Tag - Lorenzo's Blog

Kubernetes nstats

Lorenzo Girardi — Mon, 22 Feb 2021 00:00:00 +0000

Here we go… another weird sidecar container.

Motivations

I’ve always been interested in the observability area. There are many aspects that improve performances and fix bugs. One of the most interesting is network usage.

This is not about network issues:

It’s about understanding where bandwidth is actually going.

You’re probably used to seeing something like this for your VMs:

Docker-latency — The Network Blaming Tool

Lorenzo Girardi — Tue, 11 Aug 2020 00:00:00 +0000

aka the network blaming tool

Every network admin hears it. “The VPN is slow.” “I can’t connect to $something.” “It worked yesterday.”

The problem: these complaints are vague. Is it the provider? A T2/T3 routing issue? The user’s local network? Without data, you’re guessing.

This tool collects data.

How to Understand if Your Network is Really Slow

Deploy a pre-configured Grafana stack that monitors internet connection statistics. Select the endpoints that matter — VPN gateways, datacenter public IPs, main DNS servers — and get a continuous picture of latency and packet loss.

Kubernetes Service Mesh

Lorenzo Girardi — Tue, 11 Aug 2020 00:00:00 +0000

Do we need a service mesh? A few years ago I started evaluating this feature for existing infrastructure. There are many concepts to consider, and many mistakes people commonly make in thinking about what service mesh does.

Better to start with what a service mesh is NOT.

What a Service Mesh Is NOT

Not an API gateway (though they may share some components)
Not the location for firewall rules
Not a magical application performance booster
Not something to add without a clear scope — if you do, it could create disorder

What a Service Mesh IS

The short answer covers four areas: