Single-node Kubernetes cluster – docker desktop

While there are many tools to set up single-node Kubernetes cluster (e.g. minikube, MicroK8s, kind, or k3s with the k3d wrapper), docker-desktop has a significant advantage: it comes with Docker installation, on MacOS, or on Windows. It is installed simply by enabling the option “Enable Kubernetes”. It can be blown away and reset in a … Read moreSingle-node Kubernetes cluster – docker desktop

AWX on AWS with CDK (in Typescript)

Ansible Tower and AWX We have used open-source Ansible extensively in the past. While the automation is convenient, the lack of UI makes it not as suitable as a team collaboration tool. One way to allow team collaboration with open-source Ansible, is to use Jenkins to glue the components together, as discussed in the Automated … Read moreAWX on AWS with CDK (in Typescript)

Deployment of a medical imaging web service

[Update] Some security improvement was introduced in may 2021. Here‘s detail. In this project we introduce a medical imaging web service based on Orthanc, an open-source project of DICOM server, and a pipeline to deploy such server automatically and consistently. This little project involves a number of technical deets in DevOps, to deliver a web … Read moreDeployment of a medical imaging web service

Host legacy application in Docker 2 of 2

My previous notes include some tricks in hosting legacy application in docker. This is a continuation from that work, after 1.5 months… Use Case I decided to use docker to host application for a good reason, and let me start with what this Java-based application does as a single process. When it is up it … Read moreHost legacy application in Docker 2 of 2

Host legacy application in Docker 1 of 2

This is my notes from containerizing a legacy application with Docker compose. We have to run multiple instances of our application because we’re unable to secure additional VMs for this single-VM education environment. The application is target of containerization, because it requires mass reconfiguration (around TCP port) to run multiple instances of the application. We … Read moreHost legacy application in Docker 1 of 2

Virtualization 4 of 4 – Networking

Virtual LAN (VLAN) Although VLAN emerged before virtualization and is not part of virtualization topic. I’d just like to start from here as a refresher. Suppose we have computers from finance department and computers from sales department all connected to a single layer-2 switch. There are at least three problems: 1) too many devices on … Read moreVirtualization 4 of 4 – Networking