Trying out NetworkPolicy on Kubernetes running on Docker for macOS

Context I was tempting to try out NetworkPolicy1 on Kubernetes as a secure way to protect traffic in and out Pods. Today a friend of mine who was pursuing "Certified Kubernetes Application Developer" asked me a problem related to it. He was using a small set of exercises 2 to practice Kubernetes. The problem statement … Continue reading Trying out NetworkPolicy on Kubernetes running on Docker for macOS

MongoDB failed to lock file on OpenShift using NFS file system

Summary This page documented the investigation of an issue: MongoDB Pod failed to lock mongod.lock on OpenShift/OKDv4. The problem was because NFSv3 was used to mount between OKDv4 Worker Nodes to the NFS server. MongoDB used internally flock/fcntl to lock the mongod.lock file descriptor. In a network file system like NFSv3, locking support was required … Continue reading MongoDB failed to lock file on OpenShift using NFS file system

The Collector’s Fallacy  – Zettelkasten Method

On researching taking notes, speciffically the Zekkelkasten method, I learned The Collector's Fallacy. In its essenses: Saving links, copying or just reading a material does not mean that you have consumed the knowledge. You may have increased the knowlege for a short time, but it will fade away very soon after that. By taking notes, … Continue reading The Collector’s Fallacy  – Zettelkasten Method