Introduction In this post we’ll see how to work with Jinja2 and YAML in your Python projects, to easily create and modify templates based on a YAML template. Essentially, we will use the configuration in the YAML file to replace the placeholders in the Jinja 2 template file. Jinja2 is widely used, examples include Ansible and also Flask… Read More »
Couple of weeks ago, we have created multiple posts where we created some servers on Digitalocean. One of these posts can be found here. If you want to follow along with this guide, then use that post to create 3 droplets. If all went well, you will see the following screen in DigitalOcean. Using Ansible to install Kubernetes… Read More »
Introduction In a previous post, we have created 3 Ubuntu servers on DigitalOcean with Terraform. We will continue with installing Kubernetes on these servers. For performance reasons however I have created 3 servers with 2 virtual CPU’s and 2GB of memory. Creating 3 servers on DigitalOcean The previous post however still applies perfectly but we need to change… Read More »
Introduction In this post, we are going to create a server on DigitalOcean running Ubuntu. There’s plenty of ways doing it but for this post I decided to give Terraform a try. Pre-requisitesI’m assuming you have already a DigitalOcean account and have access to its webinterface. In order to create droplets via Terraform, you will need to get… Read More »
Introduction In various posts, we have already introduced some container networking solutions (see here and here). In this post, we will focus on Contiv, an opensource networking plugin that brings policy based networking across containers. What is Contiv Contiv is a Docker certified (yet opensource) networking plugin for Docker Swarm but it also works on Kubernetes. It is… Read More »
Introduction In various previous posts, we have been using docker-machine to create some servers on Virtualbox (see here), Digital Ocean (see here) and AWS (see here). As I recently setup an entire vSphere environment on an Intel NUC, I wanted to use docker-machine to setup some servers also on my vSphere environment. This short posts describes how to… Read More »
Introduction We have already spent quite some posts on getting a Kubernetes cluster up and running. This post describes the installation of a single node cluster using Minikube (a Single node Kubernetes cluster) and using a CoreOS setup. It also addresses how to setup a multinode cluster using CoreOS. In this post, we used this CoreOS multi-node setup… Read More »
Replica Set ReplicaSets are the next-generation Replication Controllers. The only difference between a ReplicaSet and a Replication Controller right now is the selector support. Similar to Replication Controllers, a ReplicaSet ensures that a specified number of pod “replicas” are running at any given time. Let’s give it a try: apiVersion: extensions/v1beta1 kind: ReplicaSet metadata: name: nginx-pod-rs spec: replicas:… Read More »
Pods Pods allows us to keep containers grouped in terms of networking and hardware infrastructure. Pods can run one or more containers in them. The idea behind pods is that they are a logical group of containers that can be replicated and scheduled by Kubernetes. A pod can be either created through the web interface or via a… Read More »
Introduction In this post, we will use the (multi-node) environment we created in this post. The idea is to walk through a very simple application and get familiar with some basic Kubernetes concepts. Getting started with Kubernetes commands First, we will look at all the pods that are running on our Kubernetes cluster. A pod basically is just… Read More »