In this tutorial, we will take a look at how Kafka can help us with handling distributed messaging, by using the Event Sourcing pattern that is inherently atomic. Then, by using a pattern called Command-Query Responsibility Segregation (CQRS), we can have a materialized view acting as the gate for data retrieval. Finally, we’ll learn how […]

If your Rails app is getting slower, here's how to properly index your database to make your Active Record queries faster.

One of the most important things we teach the junior programmers who join the Semaphore team is the mindset of shipping in small iterations. This is a simple concept, however there’s an inevitable misunderstanding that stems from the subjective ideas of “small”. Thus, in practice we need to teach by example what we really mean […]

Introduction When writing unit tests, you might come across a situation where you need to generate test data or use some dummy data in your tests. If you already have some data somewhere in a database, one solution you could employ is to generate a dump of that data and use that in your tests […]

Ansible is a general purpose automation tool that may be used for configuration management or workflow automation. Configuration management is an “infrastructure as code” practice that codifies things, e.g. what packages and versions should be installed on a system, or what daemons should be running. Workflow automation may be anything from provisioning cloud infrastructure to […]

Different teams have different approaches to dealing with flaky tests. Some even go as far as using the “Let’s run each test 10 times and if it passes at least once, it passed” approach.

Introduction Containers have recently become a very popular delivery mechanism for software applications. This is in part due to the popularity of the microservices software architecture pattern, which encourages delivering applications as a set of discrete, independent, loosely-coupled services. A microservice is an ideal payload for the container abstraction. Perhaps, the biggest influence, however, has […]

Introduction In this article, we’ll cover five tips for writing effective Capybara tests, and how to use them with RSpec and Minitest. What is Capybara? Capybara is an acceptance test framework for web applications. It’s a common choice for end-to-end, acceptance, or integration testing in Rails applications. It allows developers to simulate a user on […]

Introduction In this tutorial, we’re going to cover the following: Dockerizing a Node.js application, Setting up an AWS EC2 Container Service architecture with CloudFormation, and Hooking up a CI/CD pipeline with Semaphore. The end goal is to have a workflow that allows us to push code changes up to GitHub and have them seamlessly deployed […]

Introduction This tutorial will illustrate how you can use AWS CodeDeploy, a scalable deployment service offered by AWS that lets you automate your deployment process. We will package and continuously deploy a Go application to an EC2 instance. The tutorial will use a sample application and walk you through the process of updating your existing […]

The microservice architecture has recently been gaining traction, with many companies sharing their positive experiences with applying it. The early adopters have been tech behemoths such as Amazon and Netflix, or companies with huge user bases like SoundCloud. Based on the profiles of these companies and the assumption that there’s more complexity to running and […]

We’re happy to announce a new Semaphore feature that will help you monitor and improve your CI speed over time. We’re calling it CI Speed Insights, and it’s available to all Semaphore users as of today.

Ruby and Rails are slow — this argument is often used to downplay the worth of the language and the framework. This statement in itself is not false. Generally speaking, Ruby is slower than its direct competitors such as Node.js and Python. Yet, many businesses from small startups to platforms with millions of users use […]