My Trifecta in the October Issue of the ODROID Magazine

Oct Issue of ODROID Magazine
Oct Issue of ODROID Magazine

This may be a record. I have 3 articles published in the october issue of the ODROID Magazine.

Docker Getting Started Guide
Docker Getting Started Guide

ODROID-MC1 Docker Swarm: Getting Started Guide

Parallel Programming Getting Started Guide
Parallel Programming Getting Started Guide

ODROID-MC1 Parallel Programming: Getting Started

Docker Swarm
Docker Swarm

My ODROID-C2 Docker Swarm – Part 2: Deploying a Stack to a Swarm

Enjoy!

My ODROID-C2 Docker Swarm: Part 1 – Swarm Mode Features

Here is part 1 of my docker swarm article published in the ODROID Magazine. ODROID Magazine is a free monthly e-zine featuring hardware and software articles related to the latest ARM and single board computer technology since January 2014. Although this tutorial is designed to run on the ODROID-C2 single board computer, all the commands that you learn apply equally well on INTEL-based machines running the docker engine. The commands are exactly the same. Once learnt and you can apply your docker command line knowledge to different environments including Linux, macOS, Windows and on a cloud host.

Part 1 discusses the docker swarm features.

Part 2 describes the ‘docker stack deploy’, you can think of it as Docker Compose for swarm mode, capabilites.

Enjoy!

Click here to read my ODROID Magazine Article.

Using Docker Stack Deploy on my ODROID-C2 Cluster

 

Deploy a Stack to a Swarm

In a previous article, I deployed services in my ORDOID-C2 cluster using the Docker command line. It works but there must be a better way to do deployment especially when an application requires multiple components working together. Docker 1.13.x introduced the new docker stack deployment feature to allow deployment of a complete application stack to the swarm. A stack is a collection of services that make up an application. This new feature automatically deploys multiple services that are linked to each other obviating the need to define each one separately. In other words, docker-compose in swarm mode. To do this, I have to upgrade my Docker Engine from V1.12.6 that I installed using apt-get from the Ubuntu software repository to V1.13.x. Lucky for me, I’ve already built V1.13.1 on my ODROID-C2 myself months ago when I was experimenting unsuccessfully with swarm mode due to missing kernel modules in the OS I used at the time. See my previous article for more information on this. It is just a matter of upgrading all my ODROID-C2 nodes to V1.13.1 and I am in business. Continue reading Using Docker Stack Deploy on my ODROID-C2 Cluster

Running Docker Swarm Mode on My Facelifted ODROID-C2 Cluster

Recap

Around 6 months ago, I was experimenting with Docker swarm mode on my ODROID-C2 cluster consisting of 5 ODROID-C2s. Docker was running fine on a single machine using ‘docker run’ command but neither overlay network, routing mesh nor load balancing was working in the swarm mode. I tried using different versions of docker (1.12.x and 1.13.x) compiled on my ODROID-C2 to no avail as documented in a previous article. I also tried running Kubernetes on the ODROID-C2 cluster. Again I couldn’t get the networking part work. I suspected that the kernel was missing certain modules needed for Docker/Kubernetes networking. As the OSes at that time I tested were not stable enough, I stopped my experimentation on ARM-based machines.  Instead I played with Openshift running on INTEL 64 bit machines as INTEL always has better support than ARM in any open source project. What rekindled my passion to get Docker swarm mode working is the hardware I have lying around not being used: an ODROID VU7 multi-touch screen and a VuShell for VU7. I wanted to make use of them to do some useful work. Continue reading Running Docker Swarm Mode on My Facelifted ODROID-C2 Cluster

Migrating My WordPress Blog to a New Server

I was using my ODROID-XU4 CloudShell to run my WordPress blog (the blog site which your are reading now) and other services. It is speedy and fulfills the role well. The one thing I am annoyed about is the noise of the fan when it comes on. It gets to the point that I can no longer work in that room when the fan comes on. I have to do something. I happen to have several ODROID-U3s lying around since I replaced my ODROID-U3 cluster with my ODROID C2 cluster. The ODROID-U3 has a heat sink and no fan. I can run my WordPress blog on a SD card instead of a hard disk like that of the CloudShell. This article describes my journey in migrating my WordPress blog from the CloudShell to the ODROID-U3. I also created a replica for testing/backup on another fanless server using docker. I shall cover that in this article as well. Continue reading Migrating My WordPress Blog to a New Server

Docker 101: A Tutorial – Part 2

Here is part 2 of my docker 101 article published in the ODROID Magazine. ODROID Magazine is a free monthly e-zine featuring hardware and software articles related to the latest ARM and single board computer technology since January 2014. Although this tutorial is designed to run on the ODROID-C2 single board computer, all the commands that you learn apply equally well on INTEL-based machines running the docker engine. The commands are exactly the same. Once learnt and you can apply your docker command line knowledge to different environments including Linux, macOS, Windows and on a cloud host.

Part 1 discusses the classic docker run and other commands that build and run containers on a single docker host.

Part 2 (to be published in the December issue of the ODROID Magazine) describes docker swarm mode’s clustering and orchestration capabilities.

Enjoy!

Click here to read my ODROID Magazine Docker 101 – Part 2 Article.

Docker 101: A Tutorial – Part 1

Here is part 1 of my docker tutorial published in the ODROID Magazine. ODROID Magazine is a free monthly e-zine featuring hardware and software articles related to the latest ARM and single board computer technology since January 2014. Although this tutorial is designed to run on the ODROID-C2 single board computer, all the commands that you learnt apply equally well on INTEL-based machines running docker engine. The commands are exactly the same. Once learnt and you can apply your docker command line knowledge to different environments including Linux, macOS, Windows and on a cloud host. Enjoy!

 

Read my ODROID Magazine Docker Tutorial here!

Building My Odroid-C2 Docker Cloud Part 5 – Upgrading to Docker V1.12.1

 

Why Docker v1.12.1

In part 4 of this series, I tested Docker v1.12.0 and found that it had two serious issues:

  1. Load balancing not working
  2. Overlay network name service not working

Another reason is that I recently noticed the following warning in the log which worries me.

WARN[0000] Udev sync is not supported. This will lead to unexpected behavior, data loss and errors

 

A ticket has been raised which suggests that the issue may be curcumvented by using dynamically linked binaries.

I am hoping that v1.12.1 has resolved these issues. And I’d like to explore building dynamically linked binaries this time. Continue reading Building My Odroid-C2 Docker Cloud Part 5 – Upgrading to Docker V1.12.1

Building My Odroid-C2 Docker Cloud Part 4 – Application Deployment

Web Application with Database Backend

So far, I’ve only deployed trivial application on my docker cluster. In this article, I want to explore the level of difficulty in deploying a more realistic application. Being a lazy person who does not want to create a web application from scratch, I searched the Internet for a ready-made web application using a database backend as this kind of application is commonly deployed in the production environments. I came across a WEB4J sample application called the “Fish and Chips Club” which should do the job. From now on, I am going to refer to this application as “Fish”. This application includes features to:

  • edit club members
  • edit local restaurants
  • edit ratings of each restaurant
  • add new lunches (a given restaurant on a given day)
  • RSVP for each upcoming lunch
  • interact using a simple discussion board
  • produce simple reports
  • provide a simple search page

And it uses 3 databases running on MySQL. You can find out more about how to configure this application here.

The disadvantage of using ARM64 architecture machines like ODROID-C2 is that you don’t have that many docker images readily available to you on Docker Hub to choose from like INTEL-based machines. I can find only 1 MySQL docker image and no Apache Tomcat images at all! And this application requires Tomcat to run. However, this is not a showstopper as I can always create my own docker image!

In the following sections, I am going to deploy MySQL and Fish in different ways and assess their pros and cons. It will be a great learning experience for me as, like most of you, I am new to this too ;-) Continue reading Building My Odroid-C2 Docker Cloud Part 4 – Application Deployment

Building My Odroid-C2 Docker Cloud Part 3 – Build and Test Drive

The journey so far

My last article documented how I built Docker 1.12.0 from source on my Odroid-C2. Docker 1.12 has swarm mode ie, clustering built in. In this article, I am assembling my 5 Odroid-C2 single board computers into a cluster and test-driving the cluster with simple swarm mode commands.  This is to make sure that Docker 1.12 is working before getting into more advanced swarm mode features and executing a more realistic workload on the cluster in Part 4. Continue reading Building My Odroid-C2 Docker Cloud Part 3 – Build and Test Drive