@Marvin, is there any way to run a flow by API call when the prefect server is running as self hosting on kubernetes?

I can look up that information for you. Let's start by checking the Prefect documentation and any relevant GitHub issues for running a flow via API call when Prefect Server is self-hosted on Kubernetes. I'll run these searches in parallel – let's give it a moment. Please hold on. Well, the first attempt was rather uninspiring, wasn't it? Here's what I found: 1. GitHub Issues: - The relevant issues discussed subflow states, Docker guides, and tutorial updates, but nothing specific to running a flow via API call on a self-hosted Kubernetes Prefect Server. Let's try another approach. I'll look for more specific documentation on calling the Prefect API to run a flow and deploying Prefect on Kubernetes. Hold on. It seems I'm hitting a snag with the documentation search. I'll look for a code example on how to invoke a Prefect flow via the API, which might shed some light on how you can do this in a Kubernetes environment. One moment, please. Here's a basic example of how to define and run a Prefect flow:

from prefect import flow

@flow(log_prints=True)
def my_workflow():
    print("I can call any Python code here, including Prefect tasks or flows")

if __name__ == "__main__":
    my_workflow()  # call it like a normal Python function
    # or serve it as a long-lived process
    # my_workflow.serve("my-deployment-name")

To invoke the flow via API on a self-hosted Prefect server, you would typically use the RESTful API provided by Prefect. Unfortunately, detailed steps were not retrieved from the documentation search. ### To Run Your Flow via API: 1. Deploy Your Flow: Ensure your flow is deployed to your Prefect Server. If using Kubernetes, your Prefect server should be accessible from within your Kubernetes cluster. 2. Find the Endpoint: Use the Prefect API endpoint to trigger the flow run. This usually looks something like:

POST http://<your-prefect-server>/api/flow_runs

3. Trigger the Flow: Use an HTTP client to send a POST request to the Prefect server to run the flow. Example using

requests

library in Python:

python
   import requests

   url = "http://<your-prefect-server>/api/flow_runs"
   payload = {
       "flow_id": "<your-flow-id>",
       # additional data as required
   }
   response = <http://requests.post|requests.post>(url, json=payload)

   if response.status_code == 200:
       print("Flow run triggered successfully!")
   else:
       print(f"Failed to trigger flow run: {response.text}")

Replace

<your-prefect-server>

with the address of your self-hosted Prefect server and

<your-flow-id>

with the actual flow ID. For full details, you might want to consult the Prefect API documentation directly. Here’s an illustrative code example you can refer to. For more specific details, referencing the Prefect documentation directly, if accessible, would be the best step. If you need to delve deeper, particularly with integration specifics with Kubernetes, Prefect's documentation or Prefect's GitHub discussions might have additional insights. Would you like more examples or another search attempt in a specific area?

@Marvin, what if my prefect is under VPN?

If your Prefect Server is under a VPN, you'd need to ensure that your requests to the Prefect API can route through the VPN. Here are the steps you can follow: ### Steps for Handling VPN Access: 1. VPN Connection: Make sure that your machine or the environment from which you are making the API calls is connected to the VPN. 2. Internal IP/Hostname: Use the internal IP address or hostname that can be accessed via the VPN. This address should be the one assigned to your Prefect server within the VPN network. 3. Authentication: If your VPN requires authentication, ensure that your environment can authenticate and maintain the VPN connection during the API call. ### Example with VPN: Assuming you're using a script to interact with the Prefect API:

python
import requests

# Ensure your VPN connection is active here before making the API call

url = "<http://internal-prefect-server/api/flow_runs>"  # Use the internal address accessible via VPN
payload = {
    "flow_id": "<your-flow-id>",
    # additional data as required
}

headers = {
    "Authorization": "Bearer <your-api-token>"  # if Prefect server requires authentication
}

try:
    response = <http://requests.post|requests.post>(url, json=payload, headers=headers)
    response.raise_for_status()  # Raises HTTPError for bad responses (4xx and 5xx)

    if response.status_code == 200:
        print("Flow run triggered successfully!")
    else:
        print(f"Unexpected status code: {response.status_code}, {response.text}")

except requests.exceptions.RequestException as e:
    print(f"Failed to trigger flow run: {e}")

### VPN Setup Tips: 1. Automate VPN Connection: Use scripts to connect to the VPN automatically before running your Prefect API call script. For instance, on Linux, you can use

nmcli

or

openvpn

commands. 2. Environment Configuration: Ensure the environment where this script is executed has the necessary VPN client installed and configured. 3. Security Considerations: Ensure any credentials or tokens used for both the VPN and Prefect API are stored securely and not hard-coded in your scripts. ### Troubleshooting: - Ping Prefect Server: After connecting to the VPN, try using

ping

or

curl

commands to ensure you can reach the Prefect server. - VPN Logs: Check the VPN logs if you're unable to connect, as there might be issues with routing or authentication. - Firewall Rules: Ensure that no firewall rules are blocking the traffic between your machine and the Prefect server. If there are specific issues with your VPN setup or if you need more details on any of these steps, feel free to ask!

@Marvin, is there any PREFECT_API_KEY i can configure to use it request call?

Yes, Prefect allows the use of an API key for authenticated API requests to the Prefect server. The

PREFECT_API_KEY

can be configured as an environment variable and used in your requests. ### Steps to Configure and Use `PREFECT_API_KEY`: 1. Generate API Key: - Log in to your Prefect Cloud or Prefect Server. - Navigate to the "Account Settings" or equivalent section where you can manage API keys. - Generate a new API key and copy it. 2. Set Environment Variable: - You can set the

PREFECT_API_KEY

environment variable in your shell or within your script. Example for setting it in the shell:

sh
   export PREFECT_API_KEY="your-api-key"

Example for setting it within a Python script:

python
   import os
   os.environ["PREFECT_API_KEY"] = "your-api-key"

3. Using the API Key in Request Headers: - When making an API request, include the API key in the headers. Here’s a refined example of making an API call to trigger a flow using the API key:

python
   import os
   import requests

   # Set the API key (this can also be set in the environment directly)
   os.environ["PREFECT_API_KEY"] = "your-api-key"

   api_key = os.getenv("PREFECT_API_KEY")
   url = "http://<internal-prefect-server>/api/flow_runs"  # Use the internal address accessible via VPN
   payload = {
       "flow_id": "<your-flow-id>",
       # additional data as required
   }

   headers = {
       "Authorization": f"Bearer {api_key}"
   }

   try:
       response = <http://requests.post|requests.post>(url, json=payload, headers=headers)
       response.raise_for_status()  # Raises HTTPError for bad responses (4xx and 5xx)

       if response.status_code == 200:
           print("Flow run triggered successfully!")
       else:
           print(f"Unexpected status code: {response.status_code}, {response.text}")

   except requests.exceptions.RequestException as e:
       print(f"Failed to trigger flow run: {e}")

### Verifying API Key Integration: Check your Prefect server documentation for more details on API key management. Prefect often provides detailed guidance on generating and using API keys. ### Helpful Resources: - Prefect Documentation: https://docs.prefect.io - GitHub Discussions: Prefect GitHub Discussions If you encounter any issues or need more specific details, please let me know!