Docker

This guide will help you get LangFlow up and running using Docker and Docker Compose.

Prerequisites

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• Docker
• Docker Compose

Docker

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Clone repo and build Docker container

1. Clone the LangFlow repository:

   git clone https://github.com/langflow-ai/langflow.git

2. Navigate to the docker_example directory:

   cd langflow/docker_example

3. Run the Docker Compose file:

   docker compose up

LangFlow will now be accessible at http://localhost:7860/.

Docker Compose configuration

The Docker Compose configuration spins up two services: langflow and postgres.

LangFlow service

The langflow service uses the langflowai/langflow:latest Docker image and exposes port 7860. It depends on the postgres service.

Environment variables:

• LANGFLOW_DATABASE_URL: The connection string for the PostgreSQL database.
• LANGFLOW_CONFIG_DIR: The directory where LangFlow stores logs, file storage, monitor data, and secret keys.

Volumes:

• langflow-data: This volume is mapped to /var/lib/langflow in the container.

PostgreSQL service

The postgres service uses the postgres:16 Docker image and exposes port 5432.

Environment variables:

• POSTGRES_USER: The username for the PostgreSQL database.
• POSTGRES_PASSWORD: The password for the PostgreSQL database.
• POSTGRES_DB: The name of the PostgreSQL database.

Volumes:

• langflow-postgres: This volume is mapped to /var/lib/postgresql/data in the container.

Switch to a specific LangFlow version

If you want to use a specific version of LangFlow, you can modify the image field under the langflow service in the Docker Compose file. For example, to use version 1.0-alpha, change langflowai/langflow:latest to langflowai/langflow:1.0-alpha.