@Marvin How can I setup prefect 3.x using docker-compose? Note that I want to run flows using Docker work pool

To set up Prefect 3.x using Docker Compose and run flows with a Docker work pool, follow these steps: 1. Create a Docker Compose File: Define your services in a

docker-compose.yml

file. You will need services for Prefect, and possibly for your application if it includes other components like databases or APIs. 2. Environment Configuration: Create a

.env

file to configure environment variables. At a minimum, you should set:

bash
   PREFECT_API_URL=<http://localhost:4200/api>  # or your Prefect Cloud URL
   PREFECT_API_KEY=pnu_1234567890abcdefghijklmnopqrstuvwxyz  # if using Prefect Cloud

3. Start Prefect Services: Use Docker Compose to start your Prefect services.

bash
   docker-compose up -d

4. Setup Docker Work Pool: - Navigate to the Work Pools tab in the Prefect UI and create a Docker work pool if it doesn't exist. - Start a Docker worker to poll for scheduled flow runs:

bash
     prefect worker start -q my-docker-pool

Keep this terminal session active to allow the worker to continue picking up jobs. 5. Manage Your Application: - To stream logs:

bash
     docker-compose logs -f

- To stop the application:

bash
     docker-compose down

For more detailed instructions and examples, you can refer to these resources: - Prefect Docker Infrastructure Examples - Prefect Work Pools Documentation These steps should help you integrate Prefect 3.x with Docker Compose, leveraging Docker work pools for running flows. If you have any specific configurations or setups, feel free to ask for more detailed guidance.

@Marvin give me the docker-compose.yml file

Here's a basic example of a

docker-compose.yml

file that sets up Prefect with a Docker work pool. This example assumes you have a Prefect server and a worker:

yaml
version: '3.8'

services:
  prefect-server:
    image: prefecthq/prefect:latest
    environment:
      PREFECT_API_URL: "<http://localhost:4200/api>"
    ports:
      - "4200:4200"
    command: prefect server start

  prefect-worker:
    image: prefecthq/prefect:latest
    environment:
      PREFECT_API_URL: "<http://prefect-server:4200/api>"
      PREFECT_API_KEY: ${PREFECT_API_KEY}  # Ensure this is set in your .env file
    command: prefect worker start -q my-docker-pool
    depends_on:
      - prefect-server

### Key Points: - Prefect Server: The service

prefect-server

is running the Prefect server. It exposes port

4200

for the API. - Prefect Worker: The service

prefect-worker

starts a worker that connects to the server and listens for tasks in the

my-docker-pool

queue. - Environment Variables: Make sure to define

PREFECT_API_KEY

in a

.env

file, or replace

${PREFECT_API_KEY}

with your actual API key if you're connecting to Prefect Cloud. This setup is quite basic and might need adjustments based on your specific requirements, such as networking configurations, additional services, or scaling. Adjust the

command

sections if you have specific configurations or commands for starting the server or worker.

@Marvin do i need to do anything for prefect db

In Prefect 3.x, the default setup does not require you to explicitly manage a database for the Prefect server, as it uses a built-in SQLite database for simplicity. However, if you are running a production environment or require more robust data handling, you might want to configure an external database like PostgreSQL. Here's what you might consider doing if you decide to use an external database: 1. Add a Database Service: Define a database service in your

docker-compose.yml

. For example, using PostgreSQL:

yaml
   services:
     postgres:
       image: postgres:13
       environment:
         POSTGRES_USER: prefect
         POSTGRES_PASSWORD: prefect
         POSTGRES_DB: prefect
       volumes:
         - postgres_data:/var/lib/postgresql/data

2. Configure Prefect to Use PostgreSQL: You would need to set environment variables in the Prefect server service to connect to this database:

yaml
   services:
     prefect-server:
       image: prefecthq/prefect:latest
       environment:
         PREFECT_API_URL: "<http://localhost:4200/api>"
         PREFECT_ORION_DATABASE_CONNECTION_URL: "<postgresql+asyncpg://prefect:prefect@postgres/prefect>"
       ports:
         - "4200:4200"
       command: prefect server start
       depends_on:
         - postgres

3. Volumes for Data Persistence: Ensure you have volumes set up for data persistence:

yaml
   volumes:
     postgres_data:

This setup ensures that your Prefect server uses PostgreSQL for its backend, providing better scalability and reliability for production environments. Adjust the database credentials and configurations as needed for your specific use case.

@Marvin i also want to start prefect-worker service. this service should create a docker work pool

To set up a

prefect-worker

service that creates a Docker work pool, you can modify the

docker-compose.yml

file to include a command that ensures the work pool is created and the worker starts. Here's how you can adjust your configuration:

yaml
version: '3.8'

services:
  prefect-server:
    image: prefecthq/prefect:latest
    environment:
      PREFECT_API_URL: "<http://localhost:4200/api>"
    ports:
      - "4200:4200"
    command: prefect server start

  prefect-worker:
    image: prefecthq/prefect:latest
    environment:
      PREFECT_API_URL: "<http://prefect-server:4200/api>"
      PREFECT_API_KEY: ${PREFECT_API_KEY}  # Ensure this is set in your .env file
    command: >
      /bin/sh -c "
      prefect work-pool create my-docker-pool --type docker || true &&
      prefect worker start -q my-docker-pool
      "
    depends_on:
      - prefect-server

### Explanation: - Prefect Server: Remains the same, running the Prefect server and exposing its API. - Prefect Worker: - The command uses

/bin/sh -c

to run multiple commands in sequence. - `prefect work-pool create my-docker-pool --type docker || true`: This command attempts to create a Docker work pool named

my-docker-pool

. The

|| true

ensures that if the pool already exists, it won't cause the script to fail. - `prefect worker start -q my-docker-pool`: Starts a worker that listens to the

my-docker-pool

queue. Make sure your

.env

file is properly configured with the necessary environment variables, particularly the

PREFECT_API_KEY

if you are using Prefect Cloud. Adjust the configuration as needed to fit your specific environment and requirements.