@Marvin Hi. Every time i need to run a deployment, i need to run this command

prefect worker start --pool "my-new-pool"

Is it possible to start a worker in a pool from the dashboard UI itself? Im self hosting btw

Currently, it appears that starting a worker directly from the Prefect UI is not supported. The workflow involves starting a worker using the CLI with the command:

sh
prefect worker start --pool "my-new-pool"

This step is necessary to ensure the worker polls for flow run assignments and executes them. The worker must be actively running and connected to the Prefect API. For more details, refer to the Prefect Workers documentation. Given you're self-hosting, you might consider setting up a system service or a cron job to manage the lifecycle of your workers automatically. This approach can ensure that workers are always running without manual intervention.

@Marvin Can you imporve this docker file to include already running workers: version: '3.9' services: postgres: image: postgres:14 restart: always environment: POSTGRES_USER: postgres POSTGRES_PASSWORD: prefect POSTGRES_DB: prefect ports: - "5432:5432" server: image: prefecthq/prefect:2-python3.11 restart: always volumes: - ./.prefect:/root/.prefect entrypoint: ["/bin/bash", "-c"] command: ["prefect server start --host 0.0.0.0"] ports: - "4200:4200" environment: - PREFECT_API_DATABASE_CONNECTION_URL=postgresql+asyncpg://postgres:prefect@postgres:5432/prefect depends_on: - postgres volumes: prefect:

To include already running workers in your Docker setup, you can modify your

docker-compose.yml

to add a service for the Prefect worker. Here’s the improved version of your Docker Compose file:

yaml
version: '3.9'
services:
  postgres:
    image: postgres:14
    restart: always
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: prefect
      POSTGRES_DB: prefect
    ports:
      - "5432:5432"

  server:
    image: prefecthq/prefect:2-python3.11
    restart: always
    volumes:
      - ./.prefect:/root/.prefect
    entrypoint: ["/bin/bash", "-c"]
    command: ["prefect server start --host 0.0.0.0"]
    ports:
      - "4200:4200"
    environment:
      - PREFECT_API_DATABASE_CONNECTION_URL=<postgresql+asyncpg://postgres:prefect@postgres:5432/prefect>
    depends_on:
      - postgres

  worker:
    image: prefecthq/prefect:2-python3.11
    restart: always
    volumes:
      - ./.prefect:/root/.prefect
    entrypoint: ["/bin/bash", "-c"]
    command: ["prefect worker start --pool 'my-new-pool'"]
    depends_on:
      - server
    environment:
      - PREFECT_API_URL=<http://server:4200/api>
  
volumes:
  prefect:

In this setup: -

server

runs the Prefect server. -

worker

runs a Prefect worker that connects to the specified pool. Make sure to adjust the

PREFECT_API_URL

to point to your server’s address, and ensure the pool name in the worker’s command matches your configuration.

Also create the pool in the docker @Marvin

To create the Work Pool within the Docker setup, you can include an additional initialization step in your

server

service. This step ensures the Work Pool is created when the container starts. Here's the updated `docker-compose.yml`:

yaml
version: '3.9'
services:
  postgres:
    image: postgres:14
    restart: always
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: prefect
      POSTGRES_DB: prefect
    ports:
      - "5432:5432"

  server:
    image: prefecthq/prefect:2-python3.11
    restart: always
    volumes:
      - ./.prefect:/root/.prefect
    entrypoint: ["/bin/bash", "-c"]
    command: >
      bash -c "
        prefect server start --host 0.0.0.0 &
        sleep 10 &&
        prefect work-pool create 'my-new-pool' || true
      "
    ports:
      - "4200:4200"
    environment:
      - PREFECT_API_DATABASE_CONNECTION_URL=<postgresql+asyncpg://postgres:prefect@postgres:5432/prefect>
    depends_on:
      - postgres

  worker:
    image: prefecthq/prefect:2-python3.11
    restart: always
    volumes:
      - ./.prefect:/root/.prefect
    entrypoint: ["/bin/bash", "-c"]
    command: ["prefect worker start --pool 'my-new-pool'"]
    depends_on:
      - server
    environment:
      - PREFECT_API_URL=<http://server:4200/api>
  
volumes:
  prefect:

In this setup: - The

server

service now includes a script that starts the Prefect server in the background and waits for it to initialize (

sleep 10

). Then, it runs the command to create the Work Pool. The

|| true

ensures the command doesn't fail if the pool already exists. - The

worker

service remains the same, starting a Prefect worker that connects to the specified pool. This configuration will initialize your Prefect environment, create the Work Pool, and start a worker connected to this pool all within the Docker setup.