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Managing Secrets In Docker Swarm Clusters

Docker 1.13 introduced a set of features that allow us to centrally manage secrets and pass them only to services that need them. They provide a much-needed mechanism to provide information that should be hidden from anyone except designated services. A secret (at least from Docker’s point of view) is a blog of data. A typical use case would be ...

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Simplifying Your Transition from Macro to Microservices

This is the first part in my series of articles in moving from macro to microservices. Here, I’ll present first the reasoning as to why a developer or manager would make such a move. Later posts in the series will provide code examples and procedures for building your own solution and, finally, creating your whole environment where you gradually replace ...

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Neo4j: How do null values even work?

Every now and then I find myself wanting to import a CSV file into Neo4j and I always get confused with how to handle the various null values that can lurk within. Let’s start with an example that doesn’t have a CSV file in sight. Consider the following list and my attempt to only return null values: WITH [null, "null", ...

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Friction in Software

Friction can be a very powerful force when building software. The things that are made easier or harder can dramatically influence how we work. I’d like to discuss three areas where I’ve seen friction at work: dependency injection, code reviews and technology selection. DI Frameworks A few years ago a colleague and I discussed this and came to the conclusion ...

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WordCount with Storm and Scala

Apache Storm is a free and open source distributed realtime computation system running on the JVM. To get started we will implement a very simple example. Previously we implemented a word count hadoop job using scala and we uploaded it to hdinsight. We will focus on the same word count concept but for real time cases and implement a word ...

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How to avoid messy code

Few programmers explicitly intend to write poorly structured source code. They don’t sit down, whip out their Bad Code Design Patterns book, and wreak meticulous spaghettipocalypse. Rather, poorly structured code is what happens when programmers don’t know what they’re doing.               So: why is this difficult? Source code has many properties, and of different ...

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Why I Don’t Talk to Google Recruiters

This is a real story, and it’s not only about Google. I’m getting emails from recruiters at Amazon, Facebook, and smaller Silicon Valley startups. They find me somehow, most likely through this blog, my books, or my GitHub account. They always start with “We’re so impressed by your profile” and finish with “Let’s schedule an interview.” I always reply with ...

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A Case For Native Smart Card Support in Browsers

A smart card is a device that holds a private key securely without letting it out of its storage. The chip on your credit card is a “smart card” (yup, terminology is ambiguous – the card and the chip are interchangeably called “smart card”). There are smaller USB-pluggable hardware readers that only hold the chip (without an actual card – ...

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