# Existing Cluster with the AWS Observability accelerator base module and Infrastructure monitoring

---

This example demonstrates how to use the AWS Observability Accelerator Terraform
module with Infrastructure monitoring enabled.
The current example deploys the [AWS Distro for OpenTelemetry Operator](https://docs.aws.amazon.com/eks/latest/userguide/opentelemetry.html) for Amazon EKS with its requirements and make use of existing
Managed Service for Prometheus and Amazon Managed Grafana workspaces.

It is based on the `infrastructure monitoring`, one of our [workloads modules](../../modules/workloads/)
to provide an existing EKS cluster with an OpenTelemetry collector,
curated Grafana dashboards, Prometheus alerting and recording rules with multiple
configuration options on the cluster infrastructure.


## Prerequisites

Ensure that you have the following tools installed locally:

1. [aws cli](https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html)
2. [kubectl](https://kubernetes.io/docs/tasks/tools/)
3. [terraform](https://learn.hashicorp.com/tutorials/terraform/install-cli)


## Setup

This example uses a local terraform state. If you need states to be saved remotely,
on Amazon S3 for example, visit the [terraform remote states](https://www.terraform.io/language/state/remote) documentation

1. Clone the repo using the command below

```
git clone https://github.com/aws-observability/terraform-aws-observability-accelerator.git
```

2. Initialize terraform

```console
cd examples/existing-cluster-with-base-and-infra
terraform init
```

3. AWS Region

Specify the AWS Region where the resources will be deployed. Edit the `terraform.tfvars` file and add `aws_region="..."`. You can also use environement variables `export TF_VAR_aws_region=xxx`.

4. EKS Cluster

To run this example, you need to provide your EKS cluster name.
If you don't have a cluster ready, visit [this example](https://github.com/aws-ia/terraform-aws-eks-blueprints/tree/main/examples/eks-cluster-with-new-vpc)
first to create a new one.

Add your cluster name for `eks_cluster_id="..."` to the `terraform.tfvars` or use an environment variable `export TF_VAR_eks_cluster_id=xxx`.

5. Amazon Managed Service for Prometheus workspace (optional)

If you have an existing workspace, add `managed_prometheus_workspace_id=ws-xxx`
or use an environment variable `export TF_VAR_managed_prometheus_workspace_id=ws-xxx`.

If you don't specify anything a new workspace will be created for you.

6. Amazon Managed Grafana workspace

If you have an existing workspace, add `managed_grafana_workspace_id=g-xxx`
or use an environment variable `export TF_VAR_managed_grafana_workspace_id=g-xxx`.

7. Grafana API Key

- Give admin access to the SSO user you set up when creating the Amazon Managed Grafana Workspace:
- In the AWS Console, navigate to Amazon Grafana. In the left navigation bar, click **All workspaces**, then click on the workspace name you are using for this example.
- Under **Authentication** within **AWS Single Sign-On (SSO)**, click **Configure users and user groups**
- Check the box next to the SSO user you created and click **Make admin**
- From the workspace in the AWS console, click on the `Grafana workspace URL` to open the workspace
- If you don't see the gear icon in the left navigation bar, log out and log back in.
- Click on the gear icon, then click on the **API keys** tab.
- Click **Add API key**, fill in the _Key name_ field and select _Admin_ as the Role.
- Copy your API key into `terraform.tfvars` under the `grafana_api_key` variable (`grafana_api_key="xxx"`) or set as an environment variable on your CLI (`export TF_VAR_grafana_api_key="xxx"`)


## Deploy

```sh
terraform apply -var-file=terraform.tfvars
```

or if you had setup environment variables, run

```sh
terraform apply
```

## Visualization

1. Prometheus datasource on Grafana

Open your Grafana workspace and under Configuration -> Data sources, you should see `aws-observability-accelerator`. Open and click `Save & test`. You should see a notification confirming that the AMP workspace is ready to be used on Grafana.

2. Grafana dashboards

Go to the Dashboards panel of your Grafana workspace. You should see a list of dashboards under the `Observability Accelerator Dashboards`

<img width="1703" alt="image" src="https://user-images.githubusercontent.com/10175027/187510588-d095f69f-d3b0-4753-85b7-d20465312d35.png">

Open a specific dashboard and you should be able to view its visualization

<img width="1721" alt="Screenshot 2022-08-30 at 20 01 32" src="https://user-images.githubusercontent.com/10175027/187515925-67864dd1-2b35-4be0-a15e-1e36805e8b29.png">

2. Amazon Managed Service for Prometheus (AMP) rules and alerts

Open the AMP console and view the details of your workspace. Under the `Rules management` tab, you should find new rules deployed.

<img width="1311" alt="Screenshot 2022-08-30 at 20 22 27" src="https://user-images.githubusercontent.com/10175027/187514450-0f70b5ce-b2ee-4712-850c-c2b32db1d8d6.png">

To setup your alert receiver, with Amazon SNS, follow [this documentation](https://docs.aws.amazon.com/prometheus/latest/userguide/AMP-alertmanager-receiver.html)

## Advanced configuration

1. Cross-region Managed Prometheus workspace

If your existing Managed Prometheus workspace is in another AWS Region,
add this `managed_prometheus_region=xxx` and `managed_prometheus_workspace_id=ws-xxx`.

2. Cross-region Managed Grafana workspace

If your existing Managed Prometheus workspace is in another AWS Region,
add this `managed_prometheus_region=xxx` and `managed_prometheus_workspace_id=ws-xxx`.


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## Requirements

| Name | Version |
|------|---------|
| <a name="requirement_grafana"></a> [grafana](#requirement\_grafana) | 1.25.0 |

## Providers

| Name | Version |
|------|---------|
| <a name="provider_aws"></a> [aws](#provider\_aws) | n/a |

## Modules

| Name | Source | Version |
|------|--------|---------|
| <a name="module_eks_observability_accelerator"></a> [eks\_observability\_accelerator](#module\_eks\_observability\_accelerator) | ../../ | n/a |
| <a name="module_workloads_infra"></a> [workloads\_infra](#module\_workloads\_infra) | ../../modules/workloads/infra | n/a |

## Resources

| Name | Type |
|------|------|
| [aws_eks_cluster.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/eks_cluster) | data source |
| [aws_eks_cluster_auth.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/eks_cluster_auth) | data source |

## Inputs

| Name | Description | Type | Default | Required |
|------|-------------|------|---------|:--------:|
| <a name="input_aws_region"></a> [aws\_region](#input\_aws\_region) | AWS Region | `string` | n/a | yes |
| <a name="input_eks_cluster_id"></a> [eks\_cluster\_id](#input\_eks\_cluster\_id) | EKS Cluster Id | `string` | n/a | yes |
| <a name="input_grafana_api_key"></a> [grafana\_api\_key](#input\_grafana\_api\_key) | API key for authorizing the Grafana provider to make changes to Amazon Managed Grafana | `string` | `""` | no |
| <a name="input_grafana_endpoint"></a> [grafana\_endpoint](#input\_grafana\_endpoint) | AMG endpoint | `string` | `null` | no |
| <a name="input_managed_grafana_workspace_id"></a> [managed\_grafana\_workspace\_id](#input\_managed\_grafana\_workspace\_id) | Amazon Managed Grafana (AMG) workspace ID | `string` | `""` | no |
| <a name="input_managed_prometheus_endpoint"></a> [managed\_prometheus\_endpoint](#input\_managed\_prometheus\_endpoint) | AMP workspace ID | `string` | `""` | no |
| <a name="input_managed_prometheus_region"></a> [managed\_prometheus\_region](#input\_managed\_prometheus\_region) | Region where AMP is deployed | `string` | `""` | no |
| <a name="input_managed_prometheus_workspace_id"></a> [managed\_prometheus\_workspace\_id](#input\_managed\_prometheus\_workspace\_id) | Amazon Managed Service for Prometheus (AMP) workspace ID | `string` | `""` | no |

## Outputs

| Name | Description |
|------|-------------|
| <a name="output_aws_region"></a> [aws\_region](#output\_aws\_region) | AWS Region |
| <a name="output_eks_cluster_id"></a> [eks\_cluster\_id](#output\_eks\_cluster\_id) | EKS Cluster Id |
| <a name="output_eks_cluster_version"></a> [eks\_cluster\_version](#output\_eks\_cluster\_version) | n/a |
| <a name="output_prometheus_endpoint"></a> [prometheus\_endpoint](#output\_prometheus\_endpoint) | n/a |
| <a name="output_prometheus_id"></a> [prometheus\_id](#output\_prometheus\_id) | n/a |
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