You should learn how to create a Hashicorp terraform provider if you are studying for the Hashicorp Certified Terraform Associate exam. This article will show you how to use example codes to ensure consistency in Terraform deployments.
How do you create a Terraform Provider
Ops makes it easy to manage a service programmatically. Terraform providers will allow us to have more control over the future configuration of a service, even though we can launch it via a UI.
Terraform is a great tool that allows you to create your infrastructure using code. It is a state machine with a powerful shell that can perform API queries.
This guide will help you learn how to contribute to an existing Terraform provider, or even start one.
What is Terraform?
Terraform is a huge state machine. Terraform is a powerful state machine. Terraform providers can use any API-backed resource, including JSON and gRPC.
Terraform is a tool that manages resources between a JSON struct and a Terraform payload. Terraform is the tool for you if you are looking for an easy-to-use tool. Terraform providers can be created from any resource that has an API, as previously mentioned.
Terraform Custom Provider
These scenarios could be made possible by a custom Terraform provider:
The cloud is internal to an organization and is not available to open-source communities.
Before being accepted into the registry, a provider must be tested locally.
Expansion of an existing service provider.
Terraform’s Initiator
Now that the API is available, it is time to write the Terraform Provider logic. Consider the following points to illustrate:
To access the API, the Provider must know the API address.
Providers must be able to understand the relationship between API requests and HCL codes.
Before Terraform can display the JSON in API responses, providers must be able to flatten it.
These concerns will be addressed programmatically in the implementation process.
Terraform Helper Libraries
Let’s start by downloading Terraform’s helper library. These libraries make it easier to define Terraform’s Provider’s semantics. The plugin’s entry point is simple and exposes only one function to serve the plugin. Serve().
func main() plugin.Serve(plugin.ServeOptsProviderFunc: cmdb.Provider)
The Definition of Our Provider
Terraform Providers are defined by the input data in the schema for the Provider.
Schema: map[string]*schema.Schema”api_version”: Type: schema.TypeString,Optional: true,Default: “”,,”hostname”: Type: schema.TypeString,Required: true,,”headers”: Type: schema.TypeMap,Optional: true,Elem: &schema.SchemaType: schema.TypeString,,,,The previous line of code declares an API version, a hostname, and potentially headers (because the API we’re contacting should be versioned! ).
API calls can be made with optional headers to include custom data or authentication information.
HCL’s Provider Initialization can be done in the following:
provider “cmdb” api_version = “v1″hostname = “localhost”
The Process of Our Providers for Defining Data and Resources
Terraform requires that you specify the functions you wish to invoke at each stage of the resource’s lifecycle. Data destruction methods are almost identical to those we discuss here for data generation.
This is the definition of the name allocation data type for our Provider.
Here’s how it works.
Schema: map[string]*schema.Schema”raw”: Type: schema.TypeString,Computed: true,Elem: &schema.SchemaType: schema.TypeString,,,”name”: Type: schema.TypeString,Computed: true,Elem: &schema.SchemaType: schema.TypeString,,,”region”: Type: schema.TypeString,Required: true,,”resource_type”: Type: schema.TypeString,Required: true,,,
The lifecycle is now:
Read: initNameDataSourceRead,Simply a Read method is required for the lifecycle because we are not creating any resources, only data objects. Only a Read method for Terraform data has been developed as a subset from Terraform resources.
Take a look at our Operations section.
Calling an API and returning it