ElastiCache API and interface VPC endpoints (AWS PrivateLink)

You can establish a private connection between your VPC and Amazon ElastiCache API endpoints by creating an interface VPC endpoint. Interface endpoints are powered by AWS PrivateLink. AWS PrivateLink allows you to privately access Amazon ElastiCache API operations without an internet gateway, NAT device, VPN connection, or AWS Direct Connect connection.

Instances in your VPC don't need public IP addresses to communicate with Amazon ElastiCache API endpoints. Your instances also don't need public IP addresses to use any of the available ElastiCache API operations. Traffic between your VPC and Amazon ElastiCache doesn't leave the Amazon network. Each interface endpoint is represented by one or more elastic network interfaces in your subnets. For more information on elastic network interfaces, see Elastic network interfaces in the Amazon EC2 User Guide.

After you create an interface VPC endpoint, if you enable private DNS hostnames for the endpoint, the default ElastiCache endpoint (https://elasticache.Region.amazonaws.com) resolves to your VPC endpoint. If you do not enable private DNS hostnames, Amazon VPC provides a DNS endpoint name that you can use in the following format:

VPC_Endpoint_ID.elasticache.Region.vpce.amazonaws.com

For more information, see Interface VPC Endpoints (AWS PrivateLink) in the Amazon VPC User Guide. ElastiCache supports making calls to all of its API Actions inside your VPC.

Considerations for VPC endpoints

Before you set up an interface VPC endpoint for Amazon ElastiCache API endpoints, ensure that you review Interface endpoint properties and limitations in the Amazon VPC User Guide. All ElastiCache API operations relevant to managing Amazon ElastiCache resources are available from your VPC using AWS PrivateLink.

VPC endpoint policies are supported for ElastiCache API endpoints. By default, full access to ElastiCache API operations is allowed through the endpoint. For more information, see Controlling access to services with VPC endpoints in the Amazon VPC User Guide.

Creating an interface VPC endpoint for the ElastiCache API

You can create a VPC endpoint for the Amazon ElastiCache API using either the Amazon VPC console or the AWS CLI. For more information, see Creating an interface endpoint in the Amazon VPC User Guide.

After you create an interface VPC endpoint, you can enable private DNS hostnames for the endpoint. When you do, the default Amazon ElastiCache endpoint (https://elasticache.Region.amazonaws.com) resolves to your VPC endpoint. For the China (Beijing) and China (Ningxia) AWS Regions, you can make API requests with the VPC endpoint by using elasticache---cn-north-1.amazonaws.com.rproxy.goskope.com.cn for Beijing and elasticache---cn-northwest-1.amazonaws.com.rproxy.goskope.com.cn for Ningxia. For more information, see Accessing a service through an interface endpoint in the Amazon VPC User Guide.

Creating a VPC endpoint policy for the Amazon ElastiCache API

You can attach an endpoint policy to your VPC endpoint that controls access to the ElastiCache API. The policy specifies the following:

For more information, see Controlling access to services with VPC endpoints in the Amazon VPC User Guide.

{
	"Statement": [{
		"Principal": "*",
		"Effect": "Allow",
		"Action": [
			"elasticache:CreateCacheCluster",
			"elasticache:ModifyCacheCluster",
			"elasticache:CreateSnapshot"
		],
		"Resource": "*"
	}]
}

{
	"Statement": [{
		"Principal": "*",
		"Effect": "Allow",
		"Action": [
			"elasticache:CreateCacheCluster",
			"elasticache:ModifyCacheCluster"			
		],
		"Resource": "*"
	}]
}

{
	"Statement": [{
			"Action": "*",
			"Effect": "Allow",
			"Resource": "*",
			"Principal": "*"
		},
		{
			"Action": "*",
			"Effect": "Deny",
			"Resource": "*",
			"Principal": {
				"AWS": [
					"123456789012"
				]
			}
		}
	]
}