System Code Geeks Operating System Developers Resource Center

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 ...

I managed to resolve the issue but not by uninstalling Hyper-V. I saw a couple of suggestions but I find this one suitable (it makes sense since I’m not an IT guru): STEP 1: Open the command prompt as an Administrator. STEP 2: Run the command with no argument: bcdedit After you run the above command, you will see that ...

One of the basic problems with running a docker image is that its too easy to spew up multiple instances or containers of the same image. Consider running the following container for instance: docker run -it -e AWS_ACCESS_KEY_ID="test" -e AWS_SECRET_ACCESS_KEY="test" \ --net=host "prahladyeri/testimage:latest" /bin/bash This will start a fresh container instance from image prahladyeri/testimage:latest and you may optionally pass environment ...

Its has become an oft-repeated cliche now that docker has become the latest buzzword, both in DevOps circles as well as the open source community. But being the ever cynic and contrarian, I wasn’t quite convinced of its merits until quite recently, I thought it was just another hype that will come and go like all other things. After all, ...