Disable a direct push to GitHub main branch

On a development team, you never want to push directly to the main branch. Instead, you want to require changes to be made through pull requests so they can be properly reviewed by other developers. Some developers, including myself, occasionally forget to push to a new branch so I like to have an automated check to prevent this mistake. Here are two methods to block direct pushes to the GitHub main branch....

December 29, 2022 · 2 min · Johnny Metz

[Cross-Post] Enforce Best Dockerfile Practices with Hadolint

See the post here: Using Hadolint, a Dockerfile linter, To Enforce Best Practices

March 17, 2022 · 1 min · Johnny Metz

Dockerize a Next.js app using multi-stage builds

See the source code for a working example. Next.js is a popular React Framework that comes with a lot of great features such as hybrid static & server rendering, smart bundling, file system routing, and much more. I prefer it over vanilla React. When we dockerize a Next.js application, we want the final production and development images to be small, fast to build and easy to maintain. Let’s see how we can use multi-stage builds and other image optimization techniques to create the ideal images....

February 26, 2022 · 4 min · Johnny Metz

Dockerize your Cypress tests

See the source code for a working example. UI testing is a critical part of any modern web application. My favorite testing framework is Cypress which enables you to write clean, fast and reliable tests. It consists of two main commands: cypress run: Runs Cypress tests from the CLI without a GUI. Used mostly in CI/CD. cypress open: Opens Cypress in an interactive GUI. Used for local development. I like to dockerize my entire application so it can be run anywhere (my machine, coworker’s machine, CI/CD, etc....

January 31, 2022 · 5 min · Johnny Metz

Free up Django CPU usage in Docker with Watchman

You can use watchman in your Django project to make auto-reloads more CPU efficient. Adam Johnson’s Efficient Reloading in Django’s Runserver With Watchman blog post does an excellent job describing how to set this up. I highly recommend giving it a read. The tutorial explains how to install watchman on macOS with brew install watchman but does not explain how to install it in a Python docker container. Considering all of my Django projects are dockerized, I decided to figure it out....

January 4, 2022 · 2 min · Johnny Metz