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Category Archives: Technology

Things Technological

Wasabi and AWS S3 – A comparison

Wasabi is a very interesting and compelling competitor for AWS S3… but also potentially a superb collaborator. What are Wasabi and S3 though? Stripping these services down to their barest bones, they are cloud-based, highly available and resilient object stores with effectively unlimited storage capacity. Digging a bit further, they are both key/value stores, which […]

Lies, Damned Lies and Graphs

It appears from discussion at Wikipedia that the catchphrase “lies, damned lies and statistics” is in fact unattributed. That’s a shame, because it’s a pretty important idea – statistics are very slippery, and in this time of COVID-19 I’m seeing how easily they can be misunderstood, and misused.

AWS EC2 Instance Connect — A very neat trick

One of the problems with cloud security compared to on-premise is that there is more risk that someone unauthorised will be able to gain access to your EC2 linux instances via SSH. That’s one of the reasons I’m keen on server less solutions, various X-As-A-Service services, and on not opening up a server for access […]


A reasonably common scenario for a data-focussed consultancy is that a client may want to ship sensitive data from their on-premise or cloud environment to your AWS environment. There are a number of reasons that they may want to copy the data into your environment: it may be difficult for you to work with it […]

More Swarm Adventures

I recently went back to refresh my understanding of the state of Docker networking (there’s been some changes over the last few years I wanted to be sure of), and so have been working through the excellent tutorial materials they have built, and spinning off some tutorial materials of my own demonstrating automation of the […]

Adventures with Docker Swarm

It’s been around 3 years since I last worked with Docker in any seriousness. At that time, the state of networking and deployment was quite rudimentary, and there was still reliance on deploying load balancers and similar infrastructure. I was very impressed then, when revisiting the “getting started” tutorials, at how straight-forward and powerful Docker […]

Four Questions For Engineers

One way of looking at the art and science of software engineering is that it is a process of mapping human desires and wishes — the insides of peoples’ heads — onto a computer system. This is not a particularly novel idea, and it’s one that you are probably familiar with, but it’s an important one. Engagement with a […]

Cross-Account use of AWS CLI

The documentation around using the AWS CLI from an AWS EC2 instance on one account to access resources in another account are not great. The information is all there, somewhere, but it’s scattered across many places and to derive what you need from those sources you have to pretty well read all the sources. Two […]

Oh no! The certificate has expired!

Hey kids! You know those SSL certificates you obtained and installed today? Yeah, put a reminder in your calendar right now for a week before the expiry date, so you don’t get caught out. Future you will thank you.

OpenSSL on HighSierra

Recently I finally got around to reading the excellent OpenSSL Cookbook from Ivan Ristić – you can grab a free copy via – and the first question in my mind was “what version of OpenSSL is already installed on my Mac”. A quick check showed it’s there pre-built in HighSierra in /usr/bin: