Based on the research and looking at your compose file, there are several issues that need to be addressed: 1. Remove Angle Brackets: You have angle brackets (

<>

) in your URLs that shouldn't be there. These should be removed from: -

PREFECT_API_DATABASE_CONNECTION_URL

-

PREFECT_API_URL

2. Client Configuration: The error you're seeing suggests you're trying to connect from your local machine. You need to configure your local Prefect client to point to the correct server URL. Run this on your local machine:

bash
   prefect config set PREFECT_API_URL="<http://localhost:4200/api>"

3. Environment Variables: Your configuration can be simplified and improved. Here's the corrected version of your compose.yaml:

yaml
services:
  postgres:
    image: postgres:14
    environment:
      POSTGRES_USER: prefect
      POSTGRES_PASSWORD: prefect
      POSTGRES_DB: prefect
    volumes:
      - postgres_data:/var/lib/postgresql/data
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U prefect"]
      interval: 5s
      timeout: 5s
      retries: 5

  redis:
    image: redis:7
    volumes:
      - redis_data:/data
    healthcheck:
      test: ["CMD-SHELL", "redis-cli ping"]
      interval: 5s
      timeout: 5s
      retries: 5

  prefect-server:
    image: prefecthq/prefect:3-latest
    depends_on:
      postgres:
        condition: service_healthy
      redis:
        condition: service_healthy
    environment:
      PREFECT_API_DATABASE_CONNECTION_URL: <postgresql+asyncpg://prefect:prefect@postgres:5432/prefect>
      PREFECT_SERVER_API_HOST: 0.0.0.0
      PREFECT_MESSAGING_BROKER: prefect_redis.messaging
      PREFECT_MESSAGING_CACHE: prefect_redis.messaging
      PREFECT_REDIS_MESSAGING_HOST: redis
      PREFECT_REDIS_MESSAGING_PORT: 6379
      PREFECT_REDIS_MESSAGING_DB: 0
    command: prefect server start --no-services
    ports:
      - "4200:4200"

  prefect-services:
    image: prefecthq/prefect:3-latest
    depends_on:
      postgres:
        condition: service_healthy
      redis:
        condition: service_healthy
    environment:
      PREFECT_API_DATABASE_CONNECTION_URL: <postgresql+asyncpg://prefect:prefect@postgres:5432/prefect>
      PREFECT_MESSAGING_BROKER: prefect_redis.messaging
      PREFECT_MESSAGING_CACHE: prefect_redis.messaging
      PREFECT_REDIS_MESSAGING_HOST: redis
      PREFECT_REDIS_MESSAGING_PORT: 6379
      PREFECT_REDIS_MESSAGING_DB: 0
    command: prefect server services start

  prefect-worker:
    image: prefecthq/prefect:3-latest
    depends_on:
      prefect-server:
        condition: service_started
    environment:
      PREFECT_API_URL: <http://prefect-server:4200/api>
    command: prefect worker start --pool local-pool

volumes:
  postgres_data:
  redis_data:

To get this working: 1. Save the corrected compose file 2. Stop any running containers and remove old volumes:

bash
   docker compose down -v

3. Start the services:

bash
   docker compose up -d

4. Configure your local Prefect client:

bash
   prefect config set PREFECT_API_URL="<http://localhost:4200/api>"

5. Verify the connection:

bash
   prefect server health-check

If you're still having issues after making these changes, please check: - That port 4200 isn't being used by another service - That your Docker daemon is running - That you can reach the server using

curl <http://localhost:4200/api/health>

Let me know if you need any clarification or if you're still experiencing issues after making these changes.