How to run serverless functions on Azion

Functions is a module of the Azion Web Platform that allows you to program and execute serverless functions.

To run a function, you must:

• Create your own function or use any of those already available on Azion Marketplace.
• Instantiate a function in an application.
• Define activation triggers within Rules Engine.

Creating a new function

To create a function:

1. Access Azion Console > Functions.
2. Click on + Function.
3. Choose a name for your function.
4. Write your code.
5. Click the Save button.

Instantiating a function

To demonstrate how to instantiate and run a function on an application, this guide will use the pre-configured Azion - Hello World function. To instantiate a function on an application:

1. Access Azion Console > Applications.
2. Click on the application to which you want to add a function.
3. Go to the Functions Instances tab.
4. Click + Function Instance.
5. Name your function instance. For example: Hello World function.
6. Select the Azion - Hello World function.
7. Click the Save button.

Configuring function activation criteria

1. In the same application, go to the Rules Engine tab.
2. Click + Rule.
3. Give your rule a name.
4. Select Request Phase.
5. In the Criteria section, select:
   • If ${uri} is equal /hello-world.
6. In the Behaviors section, choose Run Function.
7. Select the Hello World function
8. Click Save.

Wait a few minutes for the propagation to be completed.

To see your instanced function, access your application using its domain and the URI set in the rule, which is in the format xxxxxxxxx.map.azionedge.net/hello-world.

Now you’ve successfully configured and instantiated a function in an application.