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# ask-marvin

Mark Reyes

09/24/2024, 5:22 PM

@Marvin how to i deploy multiple deployments based on prefect.yamls using python? use prefect v2.19

Marvin

09/24/2024, 5:23 PM

To deploy multiple deployments based on

prefect.yaml

files using Python in Prefect 2.19, you can use the Prefect CLI within your Python script. Here's a brief guide on how to accomplish this: 1. Create your
prefect.yaml
files: Ensure you have multiple

prefect.yaml

files ready for each deployment. 2. Use Python's subprocess module: You can use the

subprocess

module in Python to run Prefect CLI commands. For example, if you have two

prefect.yaml

files named

deployment1.yaml

and

deployment2.yaml

, you can deploy them using the following Python script:

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python
import subprocess

# List of your prefect.yaml files
yaml_files = ["deployment1.yaml", "deployment2.yaml"]

for yaml_file in yaml_files:
    command = f"prefect deploy -p {yaml_file}"
    subprocess.run(command, shell=True, check=True)

### Explanation: - Subprocess Module: This module allows you to spawn new processes, connect to their input/output/error pipes, and obtain their return codes. - subprocess.run
Method: Runs the command described by the

args

. It waits for the command to complete, then returns a

CompletedProcess

instance. ### Further Resources: - Prefect 2.19 Deployment Documentation This approach leverages the Prefect CLI and allows you to flexibly manage multiple deployments via Python. If you need more control or encounter specific issues, consult the Prefect documentation or community forums for additional support.

Mark Reyes

09/24/2024, 5:31 PM

@Marvin how can i make this subprocess non-interactive? it always asks me questions about schedule, custom dockerfile, etc

Marvin

09/24/2024, 5:31 PM

To make the Prefect deployments non-interactive, you need to ensure that all necessary information is specified within the

prefect.yaml

file, so the CLI does not prompt you for additional inputs. Here’s how you can adjust your approach: 1. Ensure your
prefect.yaml
is fully defined: Make sure your

prefect.yaml

includes everything asked during the CLI prompts: schedules, infrastructure (like Dockerfile), etc. Here’s a template:

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yaml
    version: 2
    flows:
      - name: my-flow
        config:
          name: my-flow
          parameters:
            param1: "value1"
          schedule:
            interval: "1 day"
          infrastructure:
            type: docker-container
            image: "your-custom-image"

2. Use the
--no-input
flag: This flag prevents the CLI from prompting for input. Additionally, specify any defaults required directly in the CLI call. Here is an updated script using the

--no-input

flag:

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python
import subprocess

# List of your prefect.yaml files
yaml_files = ["deployment1.yaml", "deployment2.yaml"]

for yaml_file in yaml_files:
    command = f"prefect deploy -p {yaml_file} --no-input"
    subprocess.run(command, shell=True, check=True)

### Explanation: - --no-input
: Ensures that the CLI does not ask for any input and proceeds with the values specified in the

prefect.yaml

files. ### Further Resources: - For more detailed information, you can visit the Prefect documentation page regarding deployments: https://docs-2.prefect.io/latest/guides/prefect-deploy/ This should streamline your deployment process and make it fully automated.

Nate

09/24/2024, 5:46 PM

its

--no-prompt

Nate

09/24/2024, 5:47 PM

https://github.com/zzstoatzz/prefect-pack/blob/main/.github/workflows/deploy.yaml#L60

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