If You’re a Solo Dev, You Don’t Need Docker | HackerNoon

The Industry Standard Trap

If you look at any “Modern Web Dev” tutorial, Step 1 is almost always: Install Docker.

We are told that Docker is essential for “Environment Parity.” We are told it prevents the dreaded “It works on my machine” syndrome. For a team of 50 developers with different operating systems and complex microservice dependencies, Docker is a godsend.

But if you are a One-Person Team working on a Rails monolith? Docker in development is a performance tax you don’t need to pay.

Here is why I deleted Docker Desktop and went back to native development.

1. The File System Friction (The “Mac” Problem)

If you are developing on a Mac, Docker is not running natively. It is running inside a virtual machine (VM).

When your Rails app in the container needs to read a file from your host machine (like a view template or a line of Ruby code), it has to cross a “bridge” between the VM and your macOS file system. Even with modern optimizations like VirtioFS, there is a latency.

• Native: rails test starts in 0.5 seconds.
• Docker: docker-compose run web bin/rails test starts in 4 seconds.

It doesn’t sound like much, but over 100 test runs a day, you are losing nearly 10 minutes just waiting for the environment to wake up. For a solo dev, flow state is everything. Those 4-second pauses are “micro-distractions” that kill momentum.

2. The “Parity” Myth for Solo Devs

The biggest argument for Docker is: “Your dev environment should match production exactly.”

But if you are a solo developer, you are the only environment. If it works on your machine, and your deployment tool (like Kamal) packages it into a container for the server, it’s going to work.

The minor differences between macOS and Linux (like how libvips is compiled) rarely affect the business logic of a standard SaaS app. When they do, you catch them in CI. You don’t need to suffer through a slow dev environment for a 1% edge case.

3. The Resource Hog

Docker Desktop on Mac is notorious for eating RAM and CPU even when it’s idling.

• Docker Desktop: Consumes 2GB+ RAM just by existing.
• Postgres.app + Redis: Consumes ~200MB and stays quiet until queried.

If you’re working on a MacBook Air or even a Pro, why give up 25% of your resources to a VM you don’t actually need?

My “Native” Stack (The Speed Demon)

Here is how I replaced the “Docker Compose” soup with a lightning-fast native setup:

• Version Manager: Mise (or asdf/rbenv). It manages Ruby, Node, and Yarn versions with zero overhead.
• Database: Postgres.app. It’s a native Mac app. You open it, the DB is there. You close it, it’s gone.
• Redis: brew install redis.
• Process Management: Overmind or bin/dev. A simple Procfile manages my Rails server, Tailwind watcher, and Sidekiq workers.

The result? My rails server starts instantly. My tests are snappy. My battery lasts longer.

When to Use Docker?

I still use Docker for Deployment.

Thanks to Kamal, I can build a Docker image of my app and push it to a VPS. This gives me the benefit of Docker (reproducible production environments) without the pain of developing inside the container.

The container is a packaging format, not a development environment.

Summary

As a solo developer, your only competitive advantage is Velocity. If your tools are slowing you down, even by a few seconds, they are failing you. Docker is a fantastic tool for organizations, but for the individual, it’s often just extra weight.

Try going native. Your CPU (and your sanity) will thank you.