Setting up Terraform for IBM Cloud Logs

Step 1. Install the Terraform CLI

Complete the following steps to install the Terraform CLI:

1. Create a terraform folder on your local machine, and navigate to your terraform folder.

   mkdir terraform && cd terraform
   

2. Download the Terraform version that you want. For example, you can download terraform_0.15.5_darwin_amd64.zip for a MacOS.

   The IBM Cloud Provider plug-in for Terraform currently supports Terraform version 0.15.x or later. Make sure to select a supported Terraform version.

3. Extract the Terraform zip file and copy the files to your terraform directory.

4. Set the environment PATH variable to your Terraform files.

   export PATH=$PATH:<terraform-directory>/terraform
   

5. Verify that the installation is successful by using a terraform command.

   ./terraform
   

Step 2. Set up the IBM Cloud Provider plug-in

After the Terraform CLI installation is complete, you must set up the IBM Cloud Provider plug-in for Terraform so that you can start working with resources and services in IBM Cloud. For a list of supported versions, see the IBM Cloud Provider plug-in releases.

To run your Terraform configuration files with Terraform version 0.15.x or higher, complete the following steps:

1. Create a versions.tf file and specify the IBM Cloud Provider plug-in version that you want to use with the version parameter.

   terraform {
       required_providers {
           ibm = {
               source = "IBM-Cloud/ibm"
               version = "<provider version>"
               }
       }
   }
   

   For example:

   terraform {
       required_version = ">= 0.15"
       required_providers {
           ibm = {
               source = "ibm-cloud/ibm"
               version = "~>1.33.0"
           }
       }
   }
   

2. Store the versions.tf file in your Git repository or the folder where Terraform is set up.

If you are using Terraform on IBM Cloud modules, you must add a versions.tf file to all the module folders. You can refer the Terraform provider block from the provider registry. You can use the IBM Cloud Observability - Terraform Module module to configure an instance.

Step 3. Configure the IBM Cloud Provider plug-in

After you complete the set up, you must configure the IBM Cloud Provider plug-in.

Before you can start working with Terraform on IBM Cloud, you must retrieve the credentials and parameters that are required for a Terraform resource or data source, and specify them in the provider configuration. This configuration is used by the IBM Cloud Provider plug-in to authenticate with the IBM Cloud platform and to view, create, update, or delete IBM Cloud resources and services.

The following table lists input parameters that you can set in the provider block of your Terraform on IBM Cloud configuration file:

For more information on how to use environment variables, see Using environment variables.

You can add multiple provider configurations within the same Terraform on the IBM Cloud configuration file to create your IBM Cloud resources with different provider parameters. For example, you can multiple providers so that you can use different input parameters, such as different regions, zones, infrastructure generations, or accounts to create the IBM Cloud resources in your Terraform on IBM Cloud configuration file. For more information, see Multiple Provider Instances.

Step 4. Initialize the Terraform CLI.

Next, initialize the Terraform CLI. Run the following command:

./terraform init

You should see the following message: Terraform has been successfully initialized!.

Step 5. Create a variables file

Create a variables file that is named variables.tf to include hard-coded values.

The following sample lists variables that you can use when you provision an instance:

variable "ibm_region" {
  description = "Name of the region where the instance will be deployed"
  type        = string
  default     = "eu-gb"
}

variable "existing_logdna_instance_name" {
  description = "Specify an existing IBM Log Analysis instance name"
  type        = string
  default     = "IBM Log Analysis-3e"
}

variable "existing_logdna_resource_group_name" {
  type        = string
  description = "Resource group for the existing Log Analysis instance."
  default     = "Default"
}

variable "rg_name" {
  type = string
  default = "Default"
}

variable "resource_tags" {
  type = string
  default = "01a9f76b-0g58-453e-88a0-85917bbf9859,access:stage,type:demo,demo,dev"
}

To see the list of valid regions, see Locations.

Step 6. Create a Terraform configuration file

Next, create a Terraform configuration file that is named main.tf. In this file, you add the configuration to create a IBM Cloud Logs instance and to assign a user an access policy in Identity and Access Management (IAM) by using HashiCorp Configuration Language (HCL). For more information, see the Terraform documentation.

The following code shows a sample configuration file to provision an instance. To retrieve the ID of the default resource group, the ibm_resource_group data source is used. The region is retrieved from the terraform.tfvars file that you created in step 1. Then, the user user@ibm.com is assigned the Manager role in the IAM access policy for the namespace for a particular region.

data "ibm_resource_group" "group" {
    name = var.resource_group_name
  }

  locals {
    instance_name = "${var.name}-${var.location}"
  }

  // Create an auditing instance

  resource "ibm_resource_instance" "resource_instance" {
    name = local.instance_name
    service = var.service_type
    plan = var.plan
    location = var.location
    resource_group_id = data.ibm_resource_group.group.id
    tags = ["logging", "public"]
  }

  // Create the resource key that is associated with the {{site.data.keyword.la_short}} instance

  resource "ibm_resource_key" "resourceKey" {
    name = var.key_name
    role = "Manager"
    resource_instance_id = ibm_resource_instance.instance.id
  }

  // Add a user policy for using the resource instance

  resource "ibm_iam_user_policy" "policy" {
    ibm_id = "user@ibm.com"
    roles  = ["Manager", "Viewer"]

    resources {
      service              = "logs"
      resource_instance_id = element(split(":", ibm_resource_instance.instance.id), 7)
    }
  }

For additional information on how to use Terraform for IBM Cloud resources, see:

• ibm_resource_instance
• ibm_resource_key
• ibm_iam_service_policy

Step 7. Provision resources

Complete the following steps:

1. Initialize the Terraform CLI.

   ./terraform init
   

2. Create a Terraform execution plan. The Terraform execution plan summarizes all the actions that need to be run to create the IBM Cloud Logs instance, the resource key, and IAM access policy in your account.

   ./terraform plan
   

3. Create the resources.

   ./terraform apply
   

   To delete resources, run ./terraform destroy.

What's next?

Verify that the resources are created.

• Launch the Observability UI and check the instance has been created.
• Launch Access (IAM). Select Service IDs and look for the resource key.
• Review the user assigned access in the console.