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My First Azure Function app using CLI

Goal:
    Here we will learn about creating and deploying our first azure function app on azure cloud, everything from command line.
 
Steps:
    First we will start with installing all preliminary command line utilities. And then we will create function locally to test, debug and then we will deploy it on the azure cloud function app.
  1. Install npm as most of azure utilities written in node, so to download all dependencies we will require npm.
    2.  sudo apt install npm

  2. Install python3 pip, virtual env with few other python development dependencies as we gonna develop our first app in python.
    3.  sudo apt install -y python3-pip python3-venv build-essential libssl-dev libffi-dev python3-dev

  3. Install azure function command line utility to initialize, debug and publish functions and azure cli to interact with azure cloud.
    4.  sudo npm install -g azure-functions-core-tools
 func --version
 curl -sL https://aka.ms/InstallAzureCLIDeb | sudo bash
 az --version

  4. Create virtual env in python and activate it.
    5.  python3 -m venv my_env
 source my_env/bin/activate

  5. Initialize first function project
    6.  func init LocalFunctionProj --python

  6. Create first azure function on local system.
    7.  cd LocalFunctionProj/
 func new --name BasicHttpExample --template "HTTP trigger"

  7. Start your function and test it locally. 
    8.  func start

  8. Test using curl commands
     curl http://localhost:7071/api/BasicHttpExample
     curl http://localhost:7071/api/BasicHttpExample?name=piyushMandovra

  9. Login using azure cli so that you can deploy on azure cloud from command line. It will take you to browser to login your azure account.
    10.  az login

  10. Publish it on azure cloud function app you have created from browser. Make sure function app is already created and you don't have any other function already deployed on function app other wise it will overwrite with whatever local version you have.
    11.  func azure functionapp publish FunctionAPPName
     
Hope it helped you in creating and deploying your first azure function. Let me know in comments in case you have faced any difficulty. I will try to help ASAP.
 
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