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Posts by Daniel Kallner

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About Daniel Kallner
As the founder and CTO of Octopus Computer Solutions. With more than 20 years of leadership experience in cloud computing, virtualization, and networking, he has spearheaded numerous deployments from scratch, scaling up systems to handle billions of daily transactions. Daniel possesses comprehensive expertise in open-source solutions, particularly in OpenStack and Kubernetes. Daniel is a trusted advisor for numerous Fortune 500 customers across the world. This website aims to highlight his expertise in production cloud computing and offer valuable industry insights, incorporating the latest technology trends.
Backup Your OpenShift etcd

Backup Your OpenShift etcd

Posted by By Daniel Kallner August 21, 2023
Introduction Understanding how to Backup Your OpenShift etcd is crucial for OpenShift operators, as etcd holds the state and configuration…
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Encrypting etcd in OpenShift

Encrypting etcd in OpenShift

Posted by By Daniel Kallner August 17, 2023
Introduction Data is the lifeblood of any OpenShift cluster, and protecting it is not just wise – it’s essential! That’s…
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Fix OpenShift “certificate has expired or is not yet valid” error

Fix OpenShift “certificate has expired or is not yet valid” error

Posted by By Daniel Kallner July 9, 2023
Introduction In the following post, we will see how Replacing the ingress certificate in OpenShift helps this error. When operating…
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python kuberenetes

Use Python to interact with Kubernetes API

Posted by By Daniel Kallner June 19, 2023
Introduction Kubernetes has become the de-facto standard for container orchestration, and Python, with its simplicity and robust library support, stands…
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Configuring Active Directory as OpenShift Identity Provider

Configuring Active Directory as OpenShift Identity Provider

Posted by By Daniel Kallner June 16, 2023
Introduction Integrating your cluster with Active Directory can bolster security. In this post, we’ll walk through the steps to Configuring…
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Manage your certificates with cert-manager and Let’s Encrypt

Manage your certificates with cert-manager and Let’s Encrypt

Posted by By Daniel Kallner June 13, 2023
Introduction In this post we will configure cert-manager on Kubernetes in order to manage your traffic using HTTPS (SSL/TLS) certificates…
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Guide to HTPasswd Authentication In OpenShift

Guide to HTPasswd Authentication In OpenShift

Posted by By Daniel Kallner June 5, 2023
Introduction Implementing HTPasswd Authentication In OpenShift is a straightforward way to manage user access and enhance cluster security. This guide…
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Disable NVIDIA GPU Card using nvidia-smi

Disable NVIDIA GPU Card using nvidia-smi

Posted by By Daniel Kallner May 26, 2023
Introduction Recently I've encountered an issue with one of our NVIDIA cards. There was some kind of card failure. Since…
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Replace OpenShift default ingress certificate

Replace OpenShift default ingress certificate

Posted by By Daniel Kallner May 14, 2023
Introduction In this post, we will replace OpenShift default ingress certificate. It’s no secret that the default certificates are not…
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How to prepare a NodeJS application for Kubernetes? Part 2

How to prepare a NodeJS application for Kubernetes? Part 2

Posted by By Daniel Kallner May 8, 2023
Introduction In the second part of our guide on How to prepare a NodeJS application for Kubernetes, we’ll dive into…
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How to Deploy Harbor Registry on Kubernetes

How to Deploy Harbor Registry on Kubernetes

Posted by By Daniel Kallner April 21, 2023
Introduction When you deploy Harbor Registry on Kubernetes you earn the flexibility and scalability of Kubernetes with the robust features…
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How to deploy Single Node OpenShift (SNO) 4.10

How to deploy Single Node OpenShift (SNO) 4.10

Posted by By Daniel Kallner March 20, 2023
Introduction In this guide we will learn how to deploy Single Node OpenShift (SNO) 4.10 as we do for several…
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