Category Archives: Operations

Docker networking: Weave

Introduction Launching some hosts We have done this many times before, so it should not be a surprise. Launch two hosts (we’ll call then node-01 and node-02) using docker-machine: WAUTERW-M-G007:Vagrant wauterw$ docker-machine create -d virtualbox node-01 Running pre-create checks… Creating machine… (node-01) Copying /Users/wauterw/.docker/machine/cache/boot2docker.iso to /Users/wauterw/.docker/machine/machines/node-01/boot2docker.iso… (node-01) Creating VirtualBox VM… (node-01) Creating SSH key… (node-01) Starting the VM…… Read More »

Docker networking: Flannel

Introduction Flannel is a networking technology used to connect containers. It is distributed and maintained by CoreOS and was originally designed for Kubernetes. It is a generic overlay network that can be used as a simple alternative to existing docker networking solutions. It provides a configurable virtual overlay network for Docker. There are many different ways to network… Read More »

Docker networking: Docker overlay network with Consul

Introduction I have said it before already, container technology is great. As long as you launch containers on a single host, life is easy. However, running containers on multiple hosts is a bit more difficult, mainly related to the multi-host networking. Luckily Docker has improved on this after the acquisition of Socketplane in 2015. In this post, we… Read More »

Rancher: Running custom Express application

Introduction In this post, we set up a Rancher cluster and in this one we installed a default WordPress application on it. Though this was a very simple example, it gave us a good view on how to work with Rancher. In this post, we are continuing from where we left of and we’ll install a customer application… Read More »

Rancher: Getting started

Introduction Containers are causing a real revolution. Docker is great (although I’m starting to see some decay as well) but Docker is not always as straightforward as you might think. It’s hard to manage millions of Docker containers, it’s hard to setup networking properly, …. Since release 1.12, there are some improvements though. In any case, I already… Read More »

Docker Swarm Mode with visualizer

Introduction Recently I came across this project. Looked quite cool and it’s something I have been looking for quite a while. I like Docker and Swarm, but things can get quite overwhelming at times, certainly if you run containers at scale. So a visualisation tool is more than welcome. There is one important point to mention here: The… Read More »

Docker Swarm mode

Introduction In this post we created a Swarm cluster. However, Swarm was a separate application if you want. Since Docker release 1.12, Docker introduced the concept of Docker Swarm mode. It enables the ability to deploy containers across multiple Docker hosts, using overlay networks for service discovery. It also brings a built-in load balancer for scaling the services.… Read More »