Welcome to my blog

Free up disk space with Docker prune

Docker is a platform for developing, shipping and running applications in isolated, lightweight and portable containers. It is a critical part of a developer’s toolbelt and one I use just about everyday. Docker can consume a large amount of disk space. Per the Docker documentation: Docker takes a conservative approach to cleaning up unused objects (often referred to as “garbage collection”), such as images, containers, volumes, and networks: these objects are generally not removed unless you explicitly ask Docker to do so....

January 21, 2023 · 4 min · Johnny Metz

[Cross-Post] Django performance: Sort by a Custom Order

See the post here: Sort a Django Queryset by a Custom Order

January 2, 2023 · 1 min · Johnny Metz

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