Docker

Auto-scaling a Docker Swarm

Setting up a Docker Swarm (“docker swarm mode” if you want to be more accurate), is pretty much a trivial process. You need 3 nodes, create a swarm on one of them and join the other two nodes to the swarm. Simple. What if you wanted a 100 swarm nodes? How fast can you provision new nodes to scale up your Docker Swarm?

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Managing configuration with Viper

Viper is a popular configuration library that’s designed with 12 factor applications in mind.

Viper is a complete configuration solution for go applications including 12 factor apps. It is designed to work within an application, and can handle all types of configuration needs and formats. Viper can be thought of as a registry for all of your applications configuration needs.

Let’s use it to provide configuration for a typical application.

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Things I learned about DevOps in Q1

Being a software engineer, programmer, developer - is not a destination. The good ones have a natural curiosity, where the main measure of an activity is what you learned while doing it. There’s a number of things that people learn - some which can eventually be explained away by documentation. What it logical isn’t always how things are.

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Store config in the environment

One of the most important 12 Factor Application principles is dictating how your configuration should be declared and passed to your application. If you’re using a database instance, the location and credentials for that database instance should come from the environment where your application is run. This means that it should be passed via an environment variable, via a command line argument, or even via a configuration file which must be passed as a command line argument.

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