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adding Microsoft.HybridCompute prereq
Nov 23, 2020
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aws_terraform_al2.md

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Onboard an AWS Amazon Linux 2 server with Azure Arc

The following README will guide you on how to use the provided Terraform plan to deploy an AWS Amazon Linux 2 virtual machine and connect it as an Azure Arc enabled server resource.

Prerequisites

Create Azure Service Principal (SP)

  • To connect the AWS virtual machine to Azure Arc, an Azure Service Principal assigned with the "Contributor" role is required. To create it, login to your Azure account run the following commands:

    az login

az ad sp create-for-rbac -n "http://AzureArcAWS" --role contributor

    Output should look similar to this:

    {
"appId": "XXXXXXXXXXXXXXXXXXXXXXXX",
"displayName": "AzureArcAWS",
"name": "http://AzureArcAWS",
"password": "XXXXXXXXXXXXXXXXXXXXXXXX",
"tenant": "XXXXXXXXXXXXXXXXXXXXXXXX"
}

    Note: It is optional but highly recommended to scope the SP to a specific Azure subscription and Resource Group

  • Azure Arc enabled servers is leveraging the Microsoft.HybridCompute resource provider (RP). Using the bellow command, register the RP.

    az provider register --namespace 'Microsoft.HybridCompute'

Create an AWS identity

In order for Terraform to create resources in AWS, we will need to create a new AWS IAM role with appropriate permissions and configure Terraform to use it.

  • Login to the AWS management console

  • After logging in, click the "Services" dropdown in the top left. Under "Security, Identity, and Compliance" select "IAM" to access the Identity and Access Management page

  • Click on "Users" from the left menu and then click on "Add user" to create a new IAM user.

  • On the "Add User" screen, name the user "terraform" and select the "Programmatic Access" checkbox then click "Next"

  • On the next "Set Permissions" screen, select "Attach existing policies directly" and then check the box next to AmazonEC2FullAccess as seen in the screenshot then click "Next"

  • On the tags screen, assign a tag with a key of "azure-arc-demo" and click "Next" to proceed to the Review screen.

  • Double check that everything looks correct and click "Create user" when ready.

  • After the user is created, you will see the user's Access key ID and Secret access key. Copy these values down before clicking the Close button. In the screen below, you can see an example of what this should look like. Once you have these keys, you will be able to use them with Terraform to create AWS resources.

Configure Terraform

Before executing the Terraform plan, you must export the environment variables which will be used by the plan. These variables are based on your Azure subscription and tenant, the Azure Service Principal, and the AWS IAM user and keys you just created.

  • Retrieve your Azure Subscription ID and tenant ID using the az account list command.

  • The Terraform plan creates resources in both Microsoft Azure and AWS. It then executes a script on an AWS EC2 virtual machine to install the Azure Arc agent and all necessary artifacts. This script requires certain information about your AWS and Azure environments. Edit scripts/vars.sh and update each of the variables with the appropriate values.

    • TF_VAR_subscription_id=Your Azure Subscription ID
    • TF_VAR_client_id=Your Azure Service Principal app id
    • TF_VAR_client_secret=Your Azure Service Principal password
    • TF_VAR_tenant_id=Your Azure tenant ID
    • AWS_ACCESS_KEY_ID=AWS access key
    • AWS_SECRET_ACCESS_KEY=AWS secret key

  • From CLI, navigate to the azure_arc_servers_jumpstart/aws/al2/terraform directory of the cloned repo.

  • Export the environment variables you edited by running scripts/vars.sh with the source command as shown below. Terraform requires these to be set for the plan to execute properly. Note that this script will also be automatically executed remotely on the AWS virtual machine as part of the Terraform deployment.

    source ./scripts/vars.sh

  • Make sure your SSH keys are available in ~/.ssh and named id_rsa.pub and id_rsa. If you followed the ssh-keygen guide above to create your key then this should already be setup correctly. If not, you may need to modify main.tf to use a key with a different path.

  • Run the terraform init command which will download the Terraform AzureRM provider.

Deployment

  • Run the terraform apply --auto-approve command and wait for the plan to finish. Upon completion, you will have an AWS Amazon Linux 2 VM deployed and connected as a new Azure Arc enabled server inside a new Resource Group.

  • Open the Azure portal and navigate to the resource group "Arc-Servers-Demo". The virtual machine created in AWS will be visible as a resource.

Semi-Automated Deployment (Optional)

As you may have noticed, the last step of the run is to register the VM as a new Azure Arc enabled server resource.

If you want to demo/control the actual registration process, do the following:

  1. In the install_arc_agent.sh.tmpl script template, comment out the "Run connect command" section and save the file.

  2. Get the public IP of the AWS VM by running terraform output

  3. SSH the VM using the ssh [email protected] where x.x.x.x is the host ip.

  4. Export all the environment variables in vars.sh

  5. Run the following command

    azcmagent connect --service-principal-id $TF_VAR_client_id --service-principal-secret $TF_VAR_client_secret --resource-group "Arc-Servers-Demo" --tenant-id $TF_VAR_tenant_id --location "westus2" --subscription-id $TF_VAR_subscription_id

  6. When complete, your VM will be registered with Azure Arc and visible in the resource group inside Azure Portal.

Delete the deployment

To delete all the resources you created as part of this demo use the terraform destroy --auto-approve command as shown below.

Alternatively, you can delete the AWS EC2 instance directly by terminating it from the AWS Console.