‘Docker Space’ is not a specific product — it usually means either Docker Hub (a container registry) or Hugging Face Spaces (a hosted Docker app platform). The right answer is to know which one the user means based on context. The team that knows both has the right interpretation of the term and the right tool for the use case.
Table of contents
- Docker Hub: the container registry
- Hugging Face Spaces with Docker
- Other container registries
- When to use a registry vs a runtime
- FAQ
Docker Hub: the container registry
Docker Hub is the most popular container registry. The right way to use it:
docker pull nginx
docker tag nginx myregistry/nginx:1.0
docker push myregistry/nginx:1.0The right answer is to log in first with docker login and to use a specific tag (default is latest). The wrong answer is to push to the default latest tag without specifying a version — that makes rollbacks impossible.
Hugging Face Spaces with Docker
Hugging Face Spaces is a hosted platform for ML demos. The Docker SDK option lets you bring your own container. The right way:
- Create a Space on huggingface.co with the Docker SDK.
- Add a
Dockerfilethat runs your app. - Push to the Space’s git repo — HF builds the container automatically.
The right answer is to use the Docker SDK when you need custom system dependencies, a specific runtime version, or a framework Hugging Face’s default Python SDK does not support.
Other container registries
The right alternatives to Docker Hub are GitHub Container Registry (ghcr.io), AWS Elastic Container Registry, Google Artifact Registry, and Azure Container Registry. The right answer for a public open-source project is ghcr.io (free, integrated with GitHub). The right answer for a private enterprise project is the cloud provider’s registry.
When to use a registry vs a runtime
The right answer is to use a registry for image storage and distribution, and a runtime (Kubernetes, ECS, Cloud Run) for image execution. The wrong answer is to use a registry as a runtime (Docker Hub does not run images, it only stores them).
FAQ
Is Docker Hub free?
Yes for public images and a limited number of private images. The right answer is to use ghcr.io for private projects to avoid Docker Hub’s pull limits.
What is the difference between Docker Hub and Docker Hub repos?
Docker Hub is the registry. Docker Hub repos are the individual image repositories.
Can I run Docker Hub images locally?
Yes, with docker pull and docker run. The right answer is to specify a tag to avoid pulling latest by accident.
What is a Docker Space on Hugging Face?
A Space is a hosted ML demo. The Docker SDK option lets you bring your own container. The right answer is to use it for demos that need custom dependencies.
How do I push to ghcr.io?
echo $GITHUB_TOKEN | docker login ghcr.io -u USERNAME --password-stdin then docker push ghcr.io/USER/IMAGE:TAG.
What about ECR?
AWS’s container registry. The right answer is to use it for AWS workloads to keep image pulls on the internal AWS network.
Is Docker Hub pull-rate limited?
Yes, free tier is 100 pulls per 6 hours for anonymous, 200 for authenticated. The right answer is to use a different registry for high-traffic deployments.
If you are sizing the infrastructure for the kind of project this post covers, the RunxBuild hosting calculator is the right place to model the line items. The compute, the memory, the storage, the bandwidth, the database - each one is a separate number, and the team’s mental model for the platform is the sum of those numbers. The RunxBuild dashboard is where the team sees the actual usage in one place.
Useful related references: