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title, slug
| title | slug |
|---|---|
| Configure an external PostgreSQL database | /configuration-custom-database |
Langflow's default database is SQLite, but you can configure Langflow to use PostgreSQL instead.
This guide will walk you through the process of setting up an external database for Langflow by replacing the default SQLite connection string sqlite:///./langflow.db with PostgreSQL.
Prerequisite
- A PostgreSQL database
Connect Langflow to PostgreSQL
To connect Langflow to PostgreSQL, follow these steps.
- Find your PostgreSQL database's connection string.
It looks like
postgresql://user:password@host:port/dbname. For example, if you started PostgreSQL with this Docker command:
docker run --name some-postgres -e POSTGRES_PASSWORD=mysecretpassword -d -p 5432:5432 postgres
Your connection string would be postgresql://some-postgres:mysecretpassword@localhost:5432/postgres.
- Create a
.envfile for configuring Langflow.
touch .env
- To set the database URL environment variable, add it to your
.envfile:
LANGFLOW_DATABASE_URL="postgresql://user:password@localhost:5432/dbname"
:::tip
The Langflow project includes a .env.example file to help you get started.
You can copy the contents of this file into your own .env file and replace the example values with your own preferred settings.
Replace the value for LANGFLOW_DATABASE_URL with your PostgreSQL connection string.
:::
- Run Langflow with the
.envfile:
langflow run --env-file .env
- In Langflow, create traffic by running a flow.
- Inspect your PostgreSQL deployment's tables and activity. You will see new tables and traffic created.
Example Langflow and PostgreSQL docker-compose.yml
The Langflow project includes a docker-compose.yml file for quick deployment with PostgreSQL.
This configuration launches Langflow and PostgreSQL containers, with Langflow pre-configured to use the PostgreSQL database. Customize the database credentials as needed.
To start the services, navigate to the /docker_example directory, and then run docker-compose up.
services:
langflow:
image: langflow-ai/langflow:latest
environment:
- LANGFLOW_DATABASE_URL=postgresql://user:password@postgres:5432/langflow
depends_on:
- postgres
postgres:
image: postgres:15
environment:
- POSTGRES_USER=user
- POSTGRES_PASSWORD=password
- POSTGRES_DB=langflow