Setting up Terraform for security groups

Terraform on IBM Cloud® enables predictable and consistent provisioning of IBM Cloud services so that you can rapidly build complex, multi-tier cloud environments following Infrastructure as Code (IaC) principles. Similar to using the IBM Cloud CLI or API and SDKs, you can automate the provisioning, update, and deletion of your security group instances by using HashiCorp Configuration Language (HCL).

Looking for a managed Terraform on IBM Cloud® solution? Try out IBM Cloud® Schematics. With Schematics, you can use the Terraform scripting language that you are familiar with, but you don't have to worry about setting up and maintaining the Terraform command line and the IBM Cloud® Provider plug-in. Schematics also provides pre-defined Terraform templates that you can easily install from the IBM Cloud® catalog.

Installing Terraform and configuring resources for service-name

Before you can create an authorization by using Terraform, make sure that you have completed the following:

Make sure that you have the required access to create and work with security group resources.
Install the Terraform CLI and configure the IBM Cloud Provider plug-in for Terraform. For more information, see the tutorial for Getting started with Terraform on IBM Cloud®. The plug-in abstracts the IBM Cloud APIs that are used to complete this task.
Create a Terraform configuration file that is named main.tf. In this file, you define resources by using HashiCorp Configuration Language. For more information, see the Terraform documentation.

Create a security groups instance by using the ibm_resource_instance resource argument in your main.tf file.

The security group resource in the following example is named sg1. For more information, see the ibm_security_group usage example.
```
resource "ibm_security_group" "sg1" {
    name = "sg1"
    description = "allow my app traffic"
}
```
After you finish building your configuration file, initialize the Terraform CLI. For more information, see Initializing Working Directories.
```
terraform init
```
Provision the resources from the main.tf file. For more information, see Provisioning Infrastructure with Terraform.
1. Run terraform plan to generate a Terraform execution plan to preview the proposed actions.
```
terraform plan
```
2. Run terraform apply to create the resources that are defined in the plan.
```
terraform apply
```
From the IBM Cloud resource list, select the Key Protect instance that you created and note the instance ID.
Verify that the access policy is successfully assigned. For more information, see Reviewing assigned access in the console.