Your first Farmer template

Introduction

In this exercise, you’ll:

• create a web application with a fully-configured Application Insights instance
• create an ARM deployment object and assign the web app to it
• generate an ARM template

Creating a Farmer app

Create an F# console application using the .NET SDK and add the Farmer package in an empty directory:

dotnet new console -lang F#
dotnet add package Farmer

Farmer also has a .NET template to get started even more quickly!

Defining a Farmer web application

Open Program.fs and delete all the contents.

In Farmer, resources are defined using special code blocks that look somewhat json-esque, known as a “builder”. In these builders you can quickly and easily configure a resource using special keywords, but unlike json you also have edit-time safety.

Create a Farmer web application using the webApp { } builder:

open Farmer
open Farmer.Builders

let myWebApp = webApp {
    name "yourFirstFarmerApp"
}

Create an ARM template deployment object, before setting the location for the overall resource group and adding the web app into it.

let deployment = arm {
    location Location.NorthEurope
    add_resource myWebApp
}

Generating the ARM template

Now you need to generate the ARM template from the deployment object to an ARM json file.

Add the following code:

deployment
|> Writer.quickWrite "myFirstTemplate"

Run the application:

dotnet run

You should notice that the file myFirstTemplate.json has been created.

The generated ARM template contains the following resources:

• A web application
• A server farm
• An application insights instance

The resources will be correctly configured with the appropriate dependencies set.

The full application

open Farmer
open Farmer.Builders

let myWebApp = webApp {
    name "yourFirstFarmerApp"
}

let deployment = arm {
    location Location.NorthEurope
    add_resource myWebApp
}

deployment
|> Writer.quickWrite "myFirstTemplate"