How to Fix Azure Functions Disappearing When Adding Event Hub Trigger

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If you’re running into deployment issues with your Azure Function, here’s a simple step-by-step guide that has helped others resolve similar problems.

First, make sure your requirements.txt file is updated properly. Add these lines to ensure all necessary Azure packages are included:

azure-functions
azure-cosmos
azure-eventhub

Next, you need to set up the connection in your Azure Function’s app settings. This involves adding your Event Hub connection string with a specific name. The name you choose here should match the connection parameter used in your function code.

For example, if your function code includes this trigger:

python
@app.event_hub_message_trigger(arg_name=”azeventhub”, event_hub_name=”your-event-hub-name”, connection=”Eventconnection”)
def eventhub_trigger(azeventhub: func.EventHubEvent):
print(‘Event processed:’, azeventhub.get_body().decode(‘utf-8’))

Then, go to your Azure portal, navigate to your Function App, and under Settings, find the “Application Settings” section. Add a new setting with the key as Eventconnection and the value as your actual Event Hub connection string. This step is crucial because it links your code with the correct event hub.

Once everything is set, deploy your function using this command:

func azure functionapp publish your-function-app-name

Replace your-function-app-name with the real name of your Function App.

After a successful deployment, you should see a message indicating the function is running smoothly.

Here’s a screenshot showing what the portal looks like after deployment:

[Insert portal screenshot here]

Hopefully, this fixes your deployment trouble! If it helps, please click the “Yes” button below to let us know. And if you have any more questions, don’t hesitate to ask.