@Marvin I’m trying to daemonize a prefect flow, but I’m currently running in a venv. So when I try to run it using the systemctl service, it spins up another ephemeral server. How do I get the systemctl service to recognize that I’m already logged into the Prefect Cloud.

To daemonize a Prefect flow using

systemctl

and ensure it uses the Virtual Environment (venv) and recognizes that you're already logged into Prefect Cloud, you should consider doing the following steps: 1. Set the Prefect API URL in the systemd service file to point to your Prefect Cloud instance. 2. Ensure that the systemd service is configured correctly to use the Virtual Environment. This is usually done by specifying the full path to the Python interpreter inside your venv in the

ExecStart

command of your service file. 3. If there are environment variables that hold credentials for Prefect Cloud (like

PREFECT__CLOUD__AUTH_TOKEN

), make sure those are also included in the systemd service file. Here is a relevant document excerpt from the Prefect documentation that provides guidance on setting up systemd services: "Step 3: Set up a systemd service. Move into the

/etc/systemd/system

folder and open a file for editing." (Source) In the systemd service file, you will need to adapt it to your environment, including specifying the correct paths to the venv's Python interpreter and any necessary environment variables. Unfortunately, the document does not provide the complete information on how to specifically set this up. If you need a step-by-step guide, it might be best to also check common practices for running Python applications in venv with systemd or consult the documentation of the specific tools you are using within your venv.

@Marvin How can I set the prefect config from systemctl?

To set the Prefect configuration when using

systemctl

, you can add the necessary configuration commands to the

ExecStart

line in your systemd service file. For example:

ini
[Service]
Environment="PREFECT__BACKEND=cloud"
Environment="PREFECT__CLOUD__API_KEY=YOUR_API_KEY_HERE"
ExecStart=/path/to/your/venv/bin/python -m prefect.backend

This example demonstrates how to set environment variables (

PREFECT__BACKEND

and

PREFECT__CLOUD__API_KEY

) in the service definition. Replace

YOUR_API_KEY_HERE

with your actual Prefect Cloud API key, and update the path to the Python executable inside your virtual environment. The code example I retrieved is not directly related to setting up a service file for Prefect and

systemctl

. It appears to be an example of how to define and serve a Prefect flow in Python code. If you need to set up a Prefect flow to be served via

systemctl

, you should focus on correctly setting the environment variables in the service file as I have outlined above. Remember to replace the placeholders with appropriate values for your setup and ensure the Python path directs to your virtual environment's Python executable. For more information on setting configurations and environment variables for Prefect, refer to the Prefect Core documentation on Environment Variables.

@Marvin Where does prefect config set store the API_KEY and API_URL

The command

prefect config set

stores configuration values in a user's Prefect configuration file. Specifically, when you set the

PREFECT__CLOUD__API_KEY

, it will store your API key in this configuration file. Similarly, setting

PREFECT__API_URL

will store the API URL that Prefect commands will use to communicate with Prefect Cloud or a Prefect server instance. The specific location of this configuration file depends on the operating system and is typically located within the user's home directory. For example, on UNIX-like systems, this might be in a

.prefect

directory within the user's home directory, and the file is usually named

config.toml

or similar. There's no direct excerpt mentioning the exact location of the file from the search results, but this information is derived from the standard practice of how configuration files are typically stored on local filesystems and the Prefect documentation on settings, as well as how API keys are managed and how storage uses blocks. To find the precise location of your Prefect configuration file, you can check the Prefect documentation or examine your home directory for a

.prefect

folder or similar configuration file structure.

prefect will keep the api key and other profile settings in

~/.prefect/profiles.toml

- marvin hallucinated some of the settings details above in general I'd think you should just set

PREFECT_API_KEY

and

PREFECT_API_URL

with

Environment="KEY=VALUE"

as shown above in the

Service

config but with the correct names