DockerCon Europe 2017

I have just attended my first ever DockerCon, I was so lucky, the conference was taking place in my hometown – Copenhagen.

It was quite awesome, I have recently attended GOTO Copenhagen at the same venue, but DockerCon was a lot bigger, with more many tracks, sessions, exhibitors and of course attendees. I have attended tool focused tech conferences before, but primarily conferences, but this reminded me of OSCON.

About attendees DockerCon did something very cool. By facilitating a hallway track, where you could either invite other users or see what other users wanted to talk about and then make contact. This put me in contact with some other developers and we could exchange experiences and war stories.

The sunday before the conference I attended a hackathon organised by the local Docker User Group and one of the exhibitors (, so I actually got to meet some of the other attendees in advance. So for the first hallway track talk I attended, I met a familiar face. Later on I met complete strangers, but it was really interesting to just meet and talk about software development and Docker.

The overall focus of the conference was very much on the operational part, integration of legacy Windows and Java apps and orchestration systems like Kubernetes, Mesos, Swarm etc.

I still feel a bit like a Docker n00b, but attending a talk by @abbyfuller showed me that I at least am getting much of the image construction right, still picked up a lot of good information and it is always good to attend conference to get your knowledge consolidated and debugged.

Another very good talk by @adrianmouat was entitled: “Tips and Tricks of the Captains”, this presentation was jam-packed with good advice and small hacks to make your day to day work with Docker more streamlined. Do check out the linked slides.

I attended a lot of talks and I got a lot of information, it will take me some time to get the notes clarified and translated into actionable items, I can however mention:

– freezing of contains for debugging
– multi stage builds
– improved security for running containers (user id setting) and use of tmpfs for mount points
– The scratch image

In addition to the talks I visited a lot of exhibitors. I made a plan of exhibitors to visit based on our current platform at work. My conclusion is that Docker is there to stay and the integrations being offered are truly leveraging container technology making it more and more interesting to evaluate in context of using Docker in production. Currently we only use it for production, next step to evaluate is test and QA.

Many of the companies making Docker integrations even offer their projects as open source, such as with Cratedb and conjur from CyberArk – I had never heard of these companies before. sponsored the sunday hackathon and has a very interesting database product. CyberArk’s conjur is aimed at secret sharing, an issue many of us face.

Apart from the list above and the interesting products (not only open source). The whole conference spun off a lot of ideas for other things I need to investigate, implement, evaluate and try out:

– Debugging containers (I have seen this done in the keynote from DockerCon 2016
– Docker integration with Jenkins for CI, there is a plugin of sorts

I plan to follow up on this blog post with some more posts on Docker, the motto of the conference something about learning and sharing – that was most certainly also practiced, so I decided I will give my two cents over the following months.

DockerCon Europe 2017

SublimeText and EditorConfig and eclint

Following some of all the cool developers on twitter, GitHub, blogs etc. I fell over EditorConfig. The homepage of the project boldly stated:

EditorConfig helps developers define and maintain consistent coding styles between different editors and IDEs. The EditorConfig project consists of a file format for defining coding styles and a collection of text editor plugins that enable editors to read the file format and adhere to defined styles. EditorConfig files are easily readable and they work nicely with version control systems.

I primarily use perltidy for my Perl projects and I have used other pretty printers in the past, so I understood what it wanted to do, but it seemed so general it did not really bring any value, not being able to replace perltidy or similar, so I disregarded it as a fad.

Anyway EditorConfig kept popping up in the projects I was looking at so I decided to give it a second chance. I am not doing a lot of projects with a lot of different languages involved, but all projects does contain some source code, possibly some Markdown and some other files in common formats etc.

The formatting capabilities of EditorConfig are pretty basic, since it does not go into deep formatting details for all the languages out there, which would also be incredibly ambitious, but basic formatting like indentation size and format, encoding, EOL and EOF style. This seemed pretty useful for the files where I could not control format using perltidy, so it would be a welcome extension to my toolbox.

Luckily a prolific Github contributor Sindre Sorhus had implemented a plugin for SublimeText (my current editor of choice). So I installed the plugin and got it configured for some of my projects and started using it.

Apart from the editor part you simply place a configuration file in your project named: .editorconfig, configure it to handle the languages contained in you project and you are good to go.

The problem, well not really a problem, but common misunderstanding is that it reformats ALL your code. It does NOT. It only works on newly added lines. At first you might be disappointed, but just opening your editor with an active plugin should not mean that all your code has to be recommitted with extensive diffs confusing everybody (and yourself) – so this is actually a reasonable constraint.

Anyway at some point, you might want to reformat everything, to get a common baseline. Here eclint can help you, eclint is available on Github. eclint can both work as a linter, meaning it checks your adherence to the configuration (editorconfig) specified, but it can also apply it.


$ eclint check yourfile


$ eclint fix yourfile

EditorConfig can help you keep you own formatting consistent for some of the more esoteric file formats and when contributing to other peoples projects, you do not have to go back and forth over formatting issues, well you might, but the EditorConfig controllable parts will be aligned. Check the website and read up on integration with your editor of choice.

eclint can help you establish a formatting baseline for your own projects, but do read the documentation and do not mix it up with your regular development or yak-shaving, since you could face large diffs.

Happy formatting,


SublimeText and EditorConfig and eclint

GOTO Copenhagen 2017

The Copenhagen edition of the GOTO conference have come to an end. I was able to attend 2 of the 3 days scheduled. I decided beforehand not to sign up for any tutorials since I new it would be difficult to take so much time away from work assignments. As anticipated I ended up having to skip the Tuesday sessions due to work priorities and constraints. I am glad that the conference is in Copenhagen, but perhaps going abroad would mean less interference, then again I would probably be caught in some hotel room doing Skype sessions.

When it it comes to conference attending and the like and taking time off to go to these things, network and reflect and learn. I find this incredibly important and I used to do it a lot more. At the same time I find it important to hold a balance between obtaining these stimuli and possibly executing on them, by applying newly learned techniques, tools and practices to your daily work. On the other hand often daily work seems to follow into certain almost static routines and die hard practices, if not scrutinised and challenged. In addition it would be awesome if you could set aside time to experiment with all the stuff you cannot squeeze into your daily work routine.

Now on to the actual content I will try to give a brief overview of my observations from the conference based on the notes I jotted down. I will not attempt to give a complete account, but some of the more interesting things will be mentioned. I encourage you to checkout the GOTO Play app if you want to watch the videos of the actual talks and most of them will probably make it to Youtube at some point in the future.

First talk I attended was entitled “SCRUM vs. SAFE”, an interesting talk based in yet another method SAFE, which attempts to address some of the short comings in SCRUM adaptation. Such as running siloed SCRUM in agile teams in a waterfall organisation etc. Tomas Eilsø the presenter gave an entertaining presentation with some good examples, so even though it was a method talk, it was not textbook excerpts, but based on Tomas experiences as a fighter pilot. The talk drew parallels to military decentralisation. The presentation also touched topics like, building a environment of trust, using cross-checks to stay safe and sharing of mental models. Indeed a great talks with lots of good points even if you are not into SCRUM or SAFE.

One of the really interesting take aways was the OODA loop, invented by John Boyd –  Observation-Orientation-Decision-Action loop or cycle. Which might be interesting in a agile setup for software development and business.

Mark Seeman (@ploeh) gave an excellent talk with the weird title “Pits of Success”. I have been following Mark for some time and even though he works in areas quite different from mine, meaning functional programming and F#, his presentation was awesome, entertaining and insightful. The presentation contained some very nice animations related to the title, be sure to watch the talk if you are intrigued.

The last presentation of that day was on a product named HoverFly and the importance of being able to test an API-driven architecture. HoverFly is a sort of trainable proxy, which can emulate APIs after training. The concept is pretty basic and has been seen before, but it still interested me, since we use a similar pattern in our system, but without the training part, meaning that emulating e.g. 3rd. party APIs is hard work. I plan to spend some more time evaluating HoverFly, to assert whether it could leverage our work in this area.

As mentioned earlier I had to skip the second day, so I have no notes on the talks from Monday.

The last day started out with Adrian Cockroft from Amazon, he is the Chief Cloud Strategist and holds an incredible string resume. He talked about cloud trends of course well founded in AWS, but still with good reflections on the role of cloud, the issues of going into the cloud, primarily the benefits, but also mentioning some of the classical computer problem, which seem to resurface, when new paradigmes, technologies and trends emerge. One could argue that Adrians talk was somewhat a sales pitch, like the HoverFly presentation, but well I did not mind, since the presenters all reflected and provided general insight in their respective topics.

Vijay Reddy from Google gave a presentation on Google Cloud and TensorFlow, much in the same ballgame as the other talks I just mentioned, but again also with a lot of good information and a live demonstration.

A completely different kind of talk was, it was much more theoretical and for me hard to follow, but it was nice with a sort of counter weight to the more concrete, pragmatic presentation. This talk quite philosophical and for me quite hard to follow. But some of the key points even sank in, in my thick skull.

The talks will all make it to Youtube at some point so keep an eye on the GOTO Youtube channel.

As always GOTO was inspiring, provocative, educational and a complete information overload. Now I will try to see how much of the accumulated information I will be able to convert into something actionable, there most certainly was a lot to reflect on.

GOTO Copenhagen 2017