open-consul/website/content/docs/ecs/terraform/secure-configuration.mdx

---
layout: docs
page_title: Secure Configuration - AWS ECS
description: >-
  Secure Configuration of the Consul Service Mesh on AWS ECS (Elastic Container Service) with Terraform.
---

# Secure Configuration

This topic describes how to enable Consul security features for your production workloads. 

## Overview

To enable security in your production workloads, you must deploy the [ACL controller](https://registry.terraform.io/modules/hashicorp/consul-ecs/aws/latest/submodules/acl-controller), which provisions tokens for other service mesh tasks. Refer to [Automatic ACL Token Provisioning](/docs/ecs/architecture#automatic-acl-token-provisioning) to learn more about the ACL controller. 

The controller cannot provision tokens for itself, so you must create the token for the ACL controller. The following steps describe the overall process of enabling security features for your production workloads:

1. Enable the security features on your Consul server cluster per the [Prerequisites](#prerequisites).
1. Create the ACL token for the ACL controller in the datacenter.
1. Create a Secrets Manager secret containing the ACL controller's token.
1. Create a Secrets Manager secret containing the Consul CA certificate.
1. Deploy the ACL controller
1. Deploy the other services on the mesh.

## Prerequisites

Implement the following security features for your Consul server clusters before applying them to your workloads: 

1. [TLS encryption](/docs/security/encryption#rpc-encryption-with-tls) for RPC communication between Consul clients and servers.
1. [Gossip encryption](/docs/security/encryption#gossip-encryption) for encrypting gossip traffic.
1. [Access control lists (ACLs)](/docs/security/acl) for authentication and authorization for Consul clients and services on the mesh.

## ACL controller

1. Create a policy that grants `acl:write` and `operator:write` access for the controller. Refer to the [ACL policies documentation](/docs/security/acl/policies) for instructions.
1. Create a token and link it to the ACL controller policy. Refer to the [ACL tokens documentation](/docs/security/acl/tokens) for instructions.
1. Create a Secrets Manager secret containing the ACL controller's token and a Secrets Manager secret containing the Consul CA cert.

  ```hcl
  resource "aws_secretsmanager_secret" "bootstrap_token" {
    name  = "bootstrap-token"
  }

  resource "aws_secretsmanager_secret_version" "bootstrap_token" {
    secret_id     = aws_secretsmanager_secret.bootstrap_token.id
    secret_string = "<bootstrap token>"
  }

  resource "aws_secretsmanager_secret" "ca_cert" {
    name  = "server-ca-cert"
  }

  resource "aws_secretsmanager_secret_version" "ca_cert" {
    secret_id     = aws_secretsmanager_secret.ca_cert.id
    secret_string = "<CA certificate for the Consul server's HTTPS endpoint>"
  }
  ```

1. Use the [`acl-controller` terraform module](https://registry.terraform.io/modules/hashicorp/consul-ecs/aws/latest/submodules/acl-controller?tab=inputs) to deploy the controller. You must provide the ARN's for the token and CA cert in the `consul_bootstrap_token_secret_arn` and `consul_server_ca_cert_arn` fields, respectively.

  ```hcl
  module "acl_controller" {
    source                            = "hashicorp/consul/aws-ecs//modules/acl-controller"
    consul_bootstrap_token_secret_arn = aws_secretsmanager_secret.bootstrap_token.arn
    consul_server_http_addr           = "https://consul-server.example.com:8501"
    consul_server_ca_cert_arn         = aws_secretsmanager_secret.ca_cert.arn
    ecs_cluster_arn                   = "arn:aws:ecs:my-region:111111111111:cluster/consul-ecs"
    region                            = "my-region"
    subnets                           = ["subnet-abcdef123456789"]
    name_prefix                       = "consul-ecs"
  }
  ```

The `name_prefix` parameter is used to prefix any secrets that the ACL controller will
update in AWS Secrets Manager. The `name_prefix` parameter value must be unique for each ECS cluster where you deploy this controller.

## Deploy your services

Follow the instructions described in [Create a task definition](/docs/ecs/terraform/install#create-the-task-definition) to create the basic configuration for the task module. Add the following additional configurations to make the configuration production-ready.

### Create an AWS Secrets Manager secret 

The secret stores the gossip encryption key that the Consul clients use.

<CodeBlock>

```hcl
resource "aws_secretsmanager_secret" "gossip_key" {
  name  = "gossip-encryption-key"
}

resource "aws_secretsmanager_secret_version" "gossip_key" {
  secret_id     = aws_secretsmanager_secret.gossip_key.id
  secret_string = "<Gossip encryption key>"
}
```
</CodeBlock>

### Enable secure deployment

Add the following configurations to enable secure deployment. The `acl_secret_name_prefix`
should be the same as the `name_prefix` you provide to the ACL controller module.

```hcl
module "my_task" {
  source = "hashicorp/consul/aws-ecs//modules/mesh-task"
  family = "my_task"

  ...

  tls                            = true
  consul_server_ca_cert_arn      = aws_secretsmanager_secret.ca_cert.arn
  gossip_key_secret_arn          = aws_secretsmanager_secret.gossip_key.arn

  acls                           = true
  consul_client_token_secret_arn = module.acl_controller.client_token_secret_arn
  acl_secret_name_prefix         = "consul-ecs"
}
```

Complete the following steps described in the Installation with Terraform chapter to deploy and connect your services:

1. [Run Terraform](/docs/ecs/terraform/install#run-terraform)
1. [Configure routes](/docs/ecs/terraform/install#configure-routes)
1. [Configure the bind address](/docs/ecs/terraform/install#configure-the-bind-address)