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This blog will cover the “Manage users and policies” objective of the EX280 exam from RedHat. In this post we will: Configure the HTPasswd identity provider for authentication Create and delete users Modify user passwords Modify user and group permissions Create and manage groups Will also sprinkle in a little bit from “Manage user...

I love using iTerm2 and Vim on my Mac. Today we are going to have a look at Profile Switching feature that iTerm2 has and how we can combine this with Vim. Recently I wrote about using vim-plug to easily install vim plugins. Using vim-plug I installed the theme “onehalfdark” (Theme link): # .vimrc "# Custom VIM File for CABenstein "## Loading ...

I have written about using Taints and Tolerations to prevent pods from running on certain (tainted) nodes and there is some influence on scheduling that we can exert using Limits and Requests. But if we really want to control pod placement we have to look no further than Node/Pod Affinity and Anti-Affinity. This allows you to specify nodes that...

In this post we will be diving in to quotas and limits. Quotas and limits can be used to allocate, limit en reserve resources within your cluster for one or multiple namepaces and can limit the usage of CPU and Memory for workloads. Limits can also be used to gurante (by reserving) resources for your workloads. Understanding and using quotas and...

This post is gonna be a bit bigger broader then what is requested on the EX280 exam objectives. In this post we will have a look at: Controlling roll-out of pods (manually rolling out or back a deployment) Scaling Deployments on the command-line Creating a auto scaler for a deployment on the command-line Now, apart from the scaling bein...

In this blog we will take a look at SCC permissions that are needed to run a pod with escalated permissions and how to use a serviceaccount (sa) to run such a pod or deployment. Small thing: I use the term pod and container in this post but I’m referring to the same idea. In Openshift and Kubernetes we talk about pods being the smallest unit of...

Creating Secrets (like creating ConfigMaps) is a vital part of Managing OpenShift workloads and is an exam objectives of the EX280 exam. Knowing how they work and how to configure them (from the command-line) will give you a better understanding of Secrets. Secrets, how do they work Secrets provide information (like config files or credentials)...

As you might have notices I use Jekyll for this blog hosted on GitHub. I might do a post later on how I use it and how I set it up. For now, all you need to know is that Jekyll turns .md(markdown) file in to a blog. This happens using GitHub actions and builds my blog from source when I commit to main. Jekyll support some dynamic code to genera...