System Code Geeks Operating System Developers Resource Center

Here at System Code Geeks we know how much you love books about system administration; we are geeks ourselves. After all, a geek that respects himself should always have his face in a book, he has to keep up with the latest technologies and developments. For this reason, we have decided to distribute 6 of our books for free. You ...

Context I have been working in a team where we use kubernetes in production (not the nginx example- the real shit) for 2 years now. I have configured and used Kubernetes clusters from version 1.4.x with tools like kube-aws to 1.6-1.7 configured with kops. Amazon’s EKS is the third breed of kubernetes provisioning solutions that I have the chance to try and this post ...

It’s been some time since we talked about putting JBoss BPM Suite into your cloud and with the new product release it’s time to talk AppDev in the Cloud again. It’s time to update the story and show you how to put Red Hat Process Automation Manager in your cloud. With this easy installation demo project you’re able to leverage process automation ...

It’s been some time since I last talked with you about business logic engines and using them in your application development cloud architecture. At that time, I showcased running JBoss BRMS in a container on OpenShift Container Platform (OCP). This gives you the cloud experience, one that’s portable across private and public clouds, but on your own local laptop.     ...

Since the release of the OpenShift Container Platform  it has been my desire to provide a simple, fully configured and easy to use installation. This installation needs to have the Red Hat Middleware product streams installed (pre-configured container options) and all the extras like source to image and .Net Core containers. Previously I showed you how to install your own ...

This is a post about a simple helm chart that I have worked on to deploy any generic app image to Kubernetes. The chart is available [here] It tries to solve the issue of having to manage a set of raw Kubernetes resources(deployment,secrets,hpa) and instead letting helm manage these resources. The chart is generic enough that it should be able to ...

I have been working with Kubernetes in production for 2 years now. Over this time we have migrated 3 or 4 times clusters, changed techinques and tools of deployments, changed habits or pushed back to some of the hype and trends coming up every day on the kubernetes scene. I guess nothing new here, this is what almost everybody does. My ...

If you want to monitor the memory and CPU usage of a particular Linux process for a few minutes, perhaps during a performance test, you can capture the data with top and plot them with gnuplot. Here is how: Run this script (perhaps via nohup) to capture the data: #!/bin/sh # Usage: ./monitor-usage.sh <PID of the process> # Output: top.dat ...

I upgraded my home server to macOS 10.14 after the upgrade on my laptop went very smooth. Also here the upgrade went smooth, but in the evening I discovered that I did not get any new email. I started investigating. First I saw that Dovecot did not correctly start because an very old pid file said it has pid 104 ...

Software design principles Principles exist in many areas of life, and they generally represent a fundamental truth or belief from which others are derived. In software, principles are rather abstract guidelines, which are supposed to be followed while designing software. There are fundamental principles for writing quality software such as KISS (Keep it simple, stupid), DRY (Don’t repeat yourself), YAGNI ...