I am continuously getting questions about blue-green releases inside a Docker Swarm cluster. Viktor, in your The DevOps 2.0 Toolkit book you told us to use blue-green deployment. How do we do it wi…...

Imagine a small Docker Swarm. The old school Swarm, not swarm-mode. On this Swarm cluster we run a myriad of different microservices that… (more…)

The primary purpose of Docker-in-Docker was to help with the development of Docker itself. Many people use it to run CI (e.g. with Jenkins), which seems fine at first, but they run into many “interesting” problems that can be avoided by bind-mounting the ... (more…)

Docker images can easily get to 2–3GB. Here’s some tips that can help reduce their sizes. (more…)

This example application demonstrates the simplest service discovery setup for a load balanced application and multiple named sub-applications using Docker.