For the last few weeks, I’ve been working with the OpenShift Kube Descheduler and OpenShift Kube Descheduler Operator.
I posted some test-cases for the seven Descheduler Profiles to demonstrate how the Profiles operate under specific conditions. Note these are unsupported test cases.
In OpenShift, the kube-scheduler binds a unit of work (Pod) to a Node. The scheduler reads from a scheduling queue the work, retrieves the current state of the cluster, scores the work based on the scheduling rules (from the policy) and the cluster’s state, and prioritizes binding the Pod to a Node. These nodes are scheduled based on an instantaneous read of the policy and the environment and a best-estimation placement of the Pod on a Node. With best estimate at the time, these clusters are constantly changing shape and context; there is a need to deschedule and schedule the…
A brief Operator training I gave to my team resulted in these notes. Thanks to many others in the reference section. An Operator codifies the tasks commonly associated with administrating, operating, and supporting an application. The codified tasks are event-driven responses to changes (create-update-delete-time) in the declared state relative to the actual state of an application, using domain knowledge to reconcile the state and report on the status.
This document outlines the installation of the OpenShift on Power, the installation of the Red Hat Single Sign-On Operator and configuring the two to work together on OCP. Thanks to Zhimin Wen who helped in my setup of the OIDC with his great work. Steps Setup OpenShift Container Platform (OCP) 4.x on IBM® Power Systems™ Virtual Server on IBM Cloud using the Terraform based automation code using the documentation provided. You’ll need to update var.tfvars to match your environment and PowerVS Service settings. At the end of the deployment, you see an output pointing to the Bastion Server. Add Hosts Entry Connect via SSH You’re connecting on…
built a demonstration using GoLang, JSON, bcrypt, http client, http server to model an actual IDP. This is a demonstration only; it really helped me setup/understand what’s happening in the RequestHeader.
Debugging weird traffic patterns on the mac, you can use [nettop]. It shows the actual amount of data transferred by the process. It’s very helpful.
To quote the Kubernetes website, “The Operator pattern captures how you can write code to automate a task beyond what Kubernetes itself provides.” The following is an compendium to use while Learning Operators. The defacto SDK to use is the Operator SDK which provides HELM, Ansible and GO scaffolding to support your implementation of the Operator pattern. The following are education classes on the OperatorSDK IBM: CO0201EN Kubernetes Operators Intermediate – introduces core operator concepts and reconciliation with Ansible, Helm and Golang IBM: CO0302EN Kubernetes Operators Advanced – covers golang-based operator reconciliation, OLM and Scorecard testing When Running through the…
I had to watch 19 hours of slow paced videos for a training on a new software product (at least new to me). I like fast paced trainings… enter a browser hack. In Firefox, Navigate to Tools > Browser Tools > Web Developer Tools Click Console Type the following snippet to find the first video on a page, and change the playback rate, and Click Enter. Note, 4.0 can be unintelligible, you’ll need to tweak the speed to match what you need. I found 2.5 to 3.0 to be very comfortable (you just can’t multitask).
[Unicode](https://www.utf8-chartable.de/) is pretty amazing, you can encode strings in single or multibyte characters. Perhaps a smile… 😀 which is `U+1F600`
There are some tricks to processing as a stream and I outline four gritty points in processing Unicode from a remote stream.