Deploying Serverless Applications with Azure Functions

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You will deploy a Azure Function Apps with HTTP-triggered serverless functions in python

Running the App

1. Login to Azure CLI (you will be prompted to do this during deployment if you forget this step):

   $ az login
   

2. Create a new stack:

   $ pulumi stack init dev
   

3. Create a virtual environment and install python dependencies

   Windows

   Run the following command to create a virtual environment

   python -m venv venv
   

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   Activate the environment:

   venv\Scripts\activate
   

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   Install dependencies:

   pip3 install -r requirements.txt
   

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   Mac and Linux

   Run the following command to create a virtual environment

   python3 -m venv venv
   

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   Activate the environment:

   source venv/bin/activate
   

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   Install dependencies:

   pip3 install -r requirements.txt
   

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   At this point, dependencies will be installed into your virtual environment. If you close your terminal at any time, you may need to re-activate the environment:

   source venv/bin/activate
   

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4. Configure the location to deploy the resources to. The Azure region to deploy to is pre-set to WestUS - but you can modify the region you would like to deploy to.

   pulumi config set azure-native:location eastus2
   

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   pulumi config set allows us to pass in configuration values from the command line. Feel free to choose any Azure region that supports the services used in these labs (see this infographic for current list of available regions). A list of some of the regions:

   centralus,eastasia,southeastasia,eastus,eastus2,westus,westus2,northcentralus,southcentralus,
   westcentralus,northeurope,westeurope,japaneast,japanwest,brazilsouth,australiasoutheast,australiaeast,
   westindia,southindia,centralindia,canadacentral,canadaeast,uksouth,ukwest,koreacentral,koreasouth,
   francecentral,southafricanorth,uaenorth,australiacentral,switzerlandnorth,germanywestcentral,
   norwayeast,jioindiawest,australiacentral2
   

   The command updates and persists the value to the local Pulumi.dev.yaml file. You can view or edit this file at any time to effect the configuration of the current stack.

5. Azure Python Function Zip file The applications settings configure the app to run on Python3 deploy the specified zip file to the Function App. The app will download the specified file, extract the code from it, discover the functions, and run them. We’ve prepared this zip file for you to get started faster, you can find its code here. The code contains a single HTTP-triggered Azure Function.

6. Run pulumi up to preview and select yes to deploy changes:

   $ pulumi up
   Previewing update (dev)
   
   View Live: https://app.pulumi.com/myuser/azure-py-functions/dev/previews/f3ea-2esdff2-123d-e79d
   
       Type                                     Name                        Plan       
   +   pulumi:pulumi:Stack                      azure-py-functions-dev      create     
   +   ├─ azure-native:resources:ResourceGroup  resourcegroup_functions_py  create     
   +   ├─ azure-native:web:AppServicePlan       consumption-plan            create     
   +   ├─ azure-native:storage:StorageAccount   storageaccount              create     
   +   └─ azure-native:web:WebApp               functionapp                 create     
   
   Resources:
       + 5 to create
   
   Do you want to perform this update?  [Use arrows to move, enter to select, type to filter]
   > yes
     no
     details
   
   Updating (dev)
   
   View Live: https://app.pulumi.com/myuser/azure-py-functions/dev/updates/1
   
       Type                                     Name                        Status      
   +   pulumi:pulumi:Stack                      azure-py-functions-dev      created     
   +   ├─ azure-native:resources:ResourceGroup  resourcegroup_functions_py  created     
   +   ├─ azure-native:web:AppServicePlan       consumption-plan            created     
   +   ├─ azure-native:storage:StorageAccount   storageaccount              created     
   +   └─ azure-native:web:WebApp               functionapp                 created     
   
   Outputs:
       consumptionplan        : "consumption-plan7b9df5ed"
       endpoint               : "https://functionappfe054af4.azurewebsites.net/api/HelloWithPython"
       function_app           : "functionappfe054af4"
       primarystoragekey      : "[secret]"
       resourcegroup          : "resourcegroup_functions_py4eba2bf2"
       storageaccount         : "storageaccounta6b2e431"
       storageaccountkeys     : "[secret]"
       storageconnectionstring: "[secret]"
   
   Resources:
       + 5 created
   
   Duration: 50s
   

7. Check the deployed function endpoints via pulumi stack output

   $ pulumi stack output endpoint
     https://functionappfe054af4.azurewebsites.net/api/HelloWithPython
   

8. You can now open the resulting endpoint in the browser or curl it:

    $ curl "$(pulumi stack output endpoint)"
    Hello from Python in Pulumi! You have stood up a serverless function in Azure!
   

Cleanup and destroy everything

1. Destroy the stack via: pulumi destroy .Select yes

   Previewing destroy (dev)
   
        Type                                     Name                        Plan       
    -   pulumi:pulumi:Stack                      azure-py-functions-dev      delete     
    -   ├─ azure-native:web:WebApp               functionapp                 delete          
     ..
     ..  
   
    Outputs:
      - endpoint               : "https://functionappfe054af4.azurewebsites.net/api/HelloWithPython"
      ..
      ..
   
    Resources:
        - 5 to delete
   
    Do you want to perform this destroy?  [Use arrows to move, enter to select, type to filter]
      yes
    > no
      details
    ..
    ..
    Resources:
    - 5 deleted
   
    Duration: 1m1s  
   

2. Remove the stack

   pulumi stack rm
   This will permanently remove the 'dev' stack!
   Please confirm that this is what you'd like to do by typing ("dev"): 
   

   Type in the name of your stack: dev