Using Outposts - Amazon ElastiCache (Redis OSS)

Using Outposts

AWS Outposts is a fully managed service that extends AWS infrastructure, services, APIs, and tools to customer premises. By providing local access to AWS managed infrastructure, AWS Outposts enables customers to build and run applications on premises using the same programming interfaces as in AWS Regions, while using local compute and storage resources for lower latency and local data processing needs. An Outpost is a pool of AWS compute and storage capacity deployed at a customer site. AWS operates, monitors, and manages this capacity as part of an AWS Region. You can create subnets on your Outpost and specify them when you create AWS resources such as ElastiCache clusters.


In this version, the following limitations apply:

  • ElastiCache for Outposts only supports M5 and R5 node families.

  • Multi-AZ (cross Outpost replication is not supported).

  • Live migration is not supported.

  • Local snapshots are not supported.

  • Engine logs and slow logs can't be enabled.

  • ElastiCache on Outposts does not support CoIP.

  • ElastiCache for Outposts is not supported in the following regions: cn-north-1, cn-northwest-1 and ap-northeast-3.

Using Outposts with the Redis OSS console

  1. Sign in to the AWS Management Console and open the ElastiCache console at

  2. On the navigation pane, choose Redis OSS caches.

  3. Select Create Redis OSS cache.

  4. Under Cluster settings, select Design your own cache and Cluster cache. Leave Cluster mode set as Disabled. Then create a name and optional description for the cache.

  5. For location, choose On premises.

  6. In On-premises section you will see the field Outpost ID. Enter the ID for where the cluster will run.

    All further settings under Cluster settings can stay as default.

  7. In Connectivity, select Create a new subnet group and enter the VPC ID. Leave the rest as default, and select Next.

Configure on-premises options

You can select either an available Outpost to add your cache cluster or, if there are no available Outposts, create a new one using the following steps:

Under On-Premises options:
  1. Under Redis OSS settings:

    1. Name: Enter a name for the Redis OSS cluster

    2. Description: Enter a description for the Redis OSS cluster.

    3. Engine version compatilbility: Engine version is based on the AWS Outpost region

    4. Port: Accept the default port, 6379. If you have a reason to use a different port, type the port number.

    5. Parameter group: Use the drop-down to select a default or custom parameter group.

    6. Node Type: Available instances are based on Outposts availability. Porting Assistant for .NET for Outposts only supports M5 and R5 node families. From the drop down list, select Outposts and then select an available node type you want to use for this cluster. Then select Save.

    7. Number of Replicas: Enter the number of read replicas you want created for this replication group. You must have at least one and no more than five read replicas. The default value is 2.

      The autogenerated names of the read replicas follow the same pattern as that of the primary cluster's name, with a dash and sequential three-digit number added to the end, beginning with -002. For example, if your replication group is named MyGroup, then the names of the secondaries would be MyGroup-002, MyGroup-003, MyGroup-004, MyGroup-005, MyGroup-006.

  2. Under Connectivity:

    1. Subnet Group: From the list, select Create new.

      • Name: Enter a name for the subnet group

      • Description: Enter a description for the subnet group

      • VPC ID: The VPC ID should match the Outpost VPC. If you select a VPC that has no subnet IDs on the Outposts, the list will return empty.

      • Availability Zone or Outpost: Select the Outpost you are using.

      • Subnet ID: Select a subnet ID that is available for the Outpost. If there are no subnet IDs available, you need to create them. For more information, see Create a Subnet.

    2. Select Create.

Viewing Outpost cluster details

On the Redis OSS list page, select a cluster that belongs to an AWS Outpost and note the following when viewing the Cluster details:

  • Availability Zone: This will represent the Outpost, using an ARN (Amazon Resource Name) and the AWS Resource Number.

  • Outpost name: The name of the AWS Outpost.

Using Outposts with the AWS CLI

You can use the AWS Command Line Interface (AWS CLI) to control multiple AWS services from the command line and automate them through scripts. You can use the AWS CLI for ad hoc (one-time) operations.

Downloading and configuring the AWS CLI

The AWS CLI runs on Windows, macOS, or Linux. Use the following procedure to download and configure it.

To download, install, and configure the CLI
  1. Download the AWS CLI on the AWS Command Line Interface webpage.

  2. Follow the instructions for Installing the AWS CLI and Configuring the AWS CLI in the AWS Command Line Interface User Guide.

Using the AWS CLI with Outposts

Use the following CLI operation to create a cache cluster that uses Outposts:

  • create-cache-cluster – Using this operation, the outpost-mode parameter accepts a value that specifies whether the nodes in the cache cluster are created in a single Outpost or across multiple Outposts.


    At this time, only single-outpost mode is supported.

    aws elasticache create-cache-cluster \ --cache-cluster-id cache cluster id \ --outpost-mode single-outpost \