The Prefect CLI is the easiest way to start a local instance of Prefect server.

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Start the server

  1. Spin up a self-hosted Prefect server instance UI with the prefect server start CLI command in the terminal:
prefect server start
  1. Open the URL for the Prefect server UI (http://127.0.0.1:4200 by default) in a browser.
Viewing the dashboard in the Prefect UI.
  1. Shut down the Prefect server with ctrl + c in the terminal.

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Configure the server

Go to your terminal session and run this command to set the API URL to point to a self-hosted Prefect server instance: 
prefect config set PREFECT_API_URL="http://127.0.0.1:4200/api"
You can save the API server address in a Prefect profile. Whenever that profile is active, the API endpoint is at that address. See Profiles and configuration for more information on profiles and configurable Prefect settings.

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Database configuration

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Use SQLite (default)

By default, Prefect uses a SQLite database stored at ~/.prefect/prefect.db. No additional configuration is needed for basic use.

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Use PostgreSQL

To use PostgreSQL as your database backend:
  1. Set the database connection URL:
prefect config set PREFECT_API_DATABASE_CONNECTION_URL="postgresql+asyncpg://postgres:yourTopSecretPassword@localhost:5432/prefect"
  1. Start the server:
prefect server start
For more database configuration options, see the database settings reference.

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Database management commands

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Reset the database

Clear all data and reapply the schema: 
prefect server database reset -y

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Manage migrations

Apply database migrations: 
# Upgrade to the latest version
prefect server database upgrade -y

# Downgrade to the previous version
prefect server database downgrade -y -r -1

# Downgrade to a specific revision
prefect server database downgrade -y -r d20618ce678e
For large databases, you may need to increase the timeout: 
export PREFECT_API_DATABASE_TIMEOUT=600
prefect server database upgrade -y

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Advanced configuration

For advanced deployment scenarios including:
  • Running behind a reverse proxy
  • Configuring SSL certificates
  • Multi-server deployments
  • Handling migration issues
See How to scale self-hosted Prefect.