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What are Templates?

Templates are saved configurations that define how your instance will be set up. Every instance on Vast.ai requires a template that specifies:
  • Docker image - The base container environment
  • Launch mode - How you’ll connect (SSH, Jupyter, or Entrypoint)
  • Initialization - Startup scripts and environment variables
  • Ports and networking - Required network configurations
For comprehensive template documentation including creating custom templates, see the main Templates section.

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Selecting a Template

When renting an instance, you must select a template first. You have three options: Pre-configured templates for common use cases:
  • PyTorch - Ready for deep learning with Jupyter
  • TensorFlow - ML development environment
  • Stable Diffusion - Image generation UIs
  • LLM Inference - Text generation setups
  • Base Ubuntu - Clean development environment

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2. Your Recent Templates

Templates you’ve previously used or customized are saved for quick access.

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3. Custom Templates

Create your own or modify existing templates to match your exact needs.

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Quick Template Selection

  1. On the search page, look for the template selector in the upper left
  2. Click “Change Template” to see available options
  3. Select a template that matches your needs
  4. The search will update to show compatible machines
Start with a recommended template and modify it rather than creating from scratch. This ensures compatibility and faster startup times.

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Launch Modes

Templates support three connection methods:

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SSH

  • Terminal access via SSH
  • Best for: Development, training scripts, command-line work
  • Includes tmux session management

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Jupyter

  • Web-based notebook interface
  • Best for: Data science, experimentation, visualization
  • Includes terminal access

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Entrypoint

  • Runs Docker’s native entrypoint
  • Best for: Automated workloads, API servers, production deployments
  • No automatic SSH/Jupyter setup

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Important Template Settings

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Docker Image

  • Always specify a version tag (avoid “latest”)
  • Vast.ai base images (vastai/pytorch) start faster due to caching
  • Custom images from Docker Hub supported

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On-start Script

  • Runs after the container starts
  • Use for installing additional packages
  • Executes as bash commands

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Disk Space

  • Set in the search interface (not the template)
  • Cannot be changed after instance creation
  • Default is 10GB - increase as needed

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Common Issues

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Template Compatibility

Not all templates work on all machines. If an instance fails to start:
  • Try a recommended template
  • Check Docker image availability
  • Verify port requirements match machine capabilities

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Invalid Docker Image Path

If you get an error like “Unable to find image ‘ubuntu20.04_latest/ssh’”:
  • You have an invalid Docker image path
  • Use proper format: nvidia/cuda:12.0.1-devel-ubuntu20.04
  • Always include repository and tag
  • Test locally: docker pull <YOUR_IMAGE_PATH>
  • Use recommended templates to ensure valid paths

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Image Loading Time

  • First launch can take 5-60 minutes depending on image size
  • Vast.ai base images load faster (pre-cached on many machines)
  • You’re not charged during loading

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Can’t Change Template on Existing Instance

Templates are recipes for new instances. Once an instance is created:
  • Template changes only affect new instances
  • To use a different template, create a new instance
  • Transfer data if needed using data movement tools

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Next Steps

Ready to customize? See the full Templates documentation for: Having issues?
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