Suraj Deshmukh

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containers, programming, golang, hacks, kubernetes, productivity, books

Suraj Deshmukh

5-Minute Read

Golang and Kubernetes

The client libraries that Kubernetes ships are meant to be imported, and you definitely don’t need this post explaining how to import them in your Golang based project. A simple go get ... should do the trick. But, what about the packages that are not meant to be imported? Or the ones that cannot be imported because of “technical reasons” ? Could you simply add them to your import statements in the .go file, and the go binary will do the right thing when you build the code?…

Suraj Deshmukh

2-Minute Read

cert

If you are writing a webhook server for Kubernetes Admission Controllers like ValidatingAdmissionWebhooks or MutatingAdmissionWebhooks, you must expose it over HTTPS. To run these servers on HTTPS, you need TLS certificates. There are solutions available which you can use to solve this problem, first and foremost that comes to my mind is cert-manager. It is a great project and automates this problem. But it is an added dependency that you might have to keep running in your cluster.

Mitigation of: Access Any Kubernetes Secret

A Validating Admission Webhook Server to deny anyone accessing forbidden Kubernetes Secrets!

Suraj Deshmukh

4-Minute Read

Config

In the previous blog, we discussed how any user without RBAC access to a Kubernetes secret can use a trick to access that secret. To mitigate that problem, we will use a validating admission webhook. But before looking at what sorcery this validating admission webhook server is, let us understand how Kubernetes handles the API requests.

Monitor your PC with Prometheus Grafana stack

Get a fine grained view of the happenings on your system!

Suraj Deshmukh

2-Minute Read

Node Exporter

How do you monitor your own computer? Of course, using Prometheus, node-exporter and Grafana. You might ask why would you wanna do that when you can simply use the operating system provided, “System Monitor”. Well, yes, you can use that. But the data you get from the OS System Monitor is coarse-grained. OS system monitor is not configurable, but this stack is.

Kubernetes The Hard Way in "Vagrant"?

The first step in your CKA preparation!

Suraj Deshmukh

2-Minute Read

CKA logo

If you are studying for the Certified Kubernetes Administrator (CKA) exam, you might have come across folks recommending Kelsey Hightower’s Kubernetes the Hard Way. It is an excellent first step for someone who has no idea about the components that form a Kubernetes cluster. As the name suggests, it is created so that you learn the Kubernetes building blocks the “hard way”.

Exec in container environment

The correct way to use exec and the signal passing.

Suraj Deshmukh

3-Minute Read

If you use exec in your container script, then the container or Kubernetes pod might exit after the command that is exec-ed into has exited. But if that’s what you wanted, then it’s okay. This blog tries to explain how to pass the signals to the applications, how they work differently when invoked uniquely and what to do if the application does handle them.

Suraj Deshmukh

6-Minute Read

PodSecurityPolicy (PSP) is hard to get right in the first attempt. There has never been a situation when I haven’t banged my head to get it working on the cluster. It is a frustrating experience, but it is one of the essential security features of Kubernetes. Some applications have started shipping the PSP configs with their helm charts, but if a helm chart does not ship a PSP config, it must be handcrafted by the cluster-admin to make the application work reliably in the cluster.

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I am a Senior Software Engineer at Microsoft, working on various tooling around container technology like Docker, Kubernetes, etc.