Install Docker on VPS

The Problem

You want to run an application as a Docker container, but installing Docker from a distro's default repository often gives you an outdated version, and the default setup doesn't include the user permissions or daemon configuration most people expect.

About this problem

Docker's own documentation strongly recommends installing from Docker's official repository rather than a distro's default package, since distro-maintained versions can lag significantly behind and sometimes miss features newer images assume. There's also a common early mistake of needing sudo for every docker command, which is fixed by adding your user to the docker group.

This comes up whenever someone wants to deploy a containerised application rather than installing it directly on the host.

What's Included

• Installing Docker Engine from Docker's official repository, not an outdated distro package
• Configuring the user account to run docker commands without sudo
• Setting sensible daemon defaults (logging limits, storage driver)
• Running a test container to confirm everything works end to end

What's NOT Included

• Writing or debugging your application's own Dockerfile or docker-compose configuration
• Setting up Docker Swarm or Kubernetes orchestration
• Migrating existing non-containerised applications into Docker (can be scoped separately)

How It Works

1. Add Docker's official repository and GPG key, then install Docker Engine and the Compose plugin from it.
2. Add your working user to the docker group so containers can be managed without sudo on every command.
3. Configure the daemon's log rotation settings to stop container logs from silently filling the disk over time.
4. Confirm the service starts automatically on boot.
5. Run a test container (e.g. hello-world) to confirm the full install works end to end.

In practice: you buy the service, send over whatever access or details the job needs, I investigate and do the work, and you confirm it's resolved before we call it done.

Frequently Asked Questions

Why shouldn't I just use apt install docker?

Most distro repositories ship an older, sometimes significantly outdated Docker version compared to Docker's own official repository, which can cause compatibility issues with newer images and Compose files.

Do I need to use sudo for every Docker command?

Not after your user is added to the docker group — that's a standard part of setup that a lot of default guides skip, leaving people typing sudo unnecessarily.

Will Docker fill up my VPS's disk space?

It can, if container logs and unused images/volumes are never cleaned up — sensible log rotation settings and the occasional docker system prune keep this in check.

Can I run Docker on a 1GB RAM VPS?

Yes for lightweight containers, but memory gets tight fast with multiple containers or anything memory-hungry like a database — it's worth checking your actual container's requirements against available RAM.

What's the difference between Docker and a VPS?

A VPS is the virtual machine itself; Docker runs isolated containers on top of it, letting you run multiple applications with their own dependencies without them interfering with each other.

Does installing Docker remove my existing web server?

No, Docker runs alongside existing software — if you then run a containerised web server, you just need to make sure it's not trying to use the same port as anything already running.