Documentation history

Support for ElastiCache for Memcached 1.6.22

ElastiCache for Memcached now supports Memcached 1.6.22. It includes cumulative bug fixes from version 1.6.18. For more information, see Memcached Version 1.6.22.

January 10, 2024

ElastiCache for Memcached now supports creation of serverless caches

You can now create serverless caches, which simplify cache management and instantly scale to support the most demanding applications. For more information, see Choosing between deployment options. As part of this feature, new permissions were added to ElastiCacheServiceRolePolicy and AmazonElastiCacheFullAccess to allow association of serverless caches with managed VPC endpoints. Additionally, permissions were added to support a revised console experience using AmazonElastiCacheFullAccess policy.

November 27, 2023

Support for ElastiCache for Memcached 1.6.17

ElastiCache for Memcached now supports Memcached 1.6.17. It includes cumulative bug fixes from version Memcached 1.6.12 For more information, see Memcached Version 1.6.17.

January 18, 2023

ElastiCache for Memcached now supports IPV6

ElastiCache supports the Internet Protocol versions 4 and 6 (IPv4 and IPv6), allowing you to configure your cluster to accept only IPv4 connections, only IPv6 connections or both IPv4 and IPv6 connections (dual-stack). IPv6 is supported for workloads using Memcached engine version 1.6.6 onward on all instances built on the Nitro system. There are no additional charges for accessing ElastiCache over IPv6. For more information, see Choosing a network type.

November 7, 2022

ElastiCache for Memcached now supports in-transit encryption

In-transit encryption is an optional feature that allows you to increase the security of your data at its most vulnerable points – when it is in transit from one location to another. It is supported on Memcached versions 1.6.12 and later. For more information, see ElastiCache in-transit encryption (TLS).

May 26, 2022

ElastiCache now supports PrivateLink

Amazon PrivateLink allows you to privately access ElastiCache API operations without an internet gateway, NAT device, VPN connection, or Amazon Direct Connect connection. For more information, see Amazon ElastiCache API and interface VPC endpoints (Amazon PrivateLink) for Redis or Amazon ElastiCache API and interface VPC endpoints (Amazon PrivateLink) for Memcached.

January 24, 2022

Support for tagging resources and condition keys

ElastiCache now supports tagging to help you manage your clusters and other ElastiCache resources. For more information, see Tagging your ElastiCache resources. ElastiCache also introduces support for condition keys. You can specify conditions that determine how an IAM policy takes effect. For more information, see Using condition keys.

April 7, 2021

Support for Memcached 1.6.6.

ElastiCache for Memcached now supports Memcached 1.6.6. It includes cumulative bug fixes from versions Memcached 1.5.16. For more information, see Memcached Version 1.6.6.

November 12, 2020

ElastiCache is now available on Amazon Outposts

Amazon Outposts bring native Amazon services, infrastructure, and operating models to virtually any data center, co-location space, or on-premises facility. You can deploy ElastiCache on Outposts to set up, operate, and use cache on-premises, just as you would in the cloud. For more information, see Using Outposts for Redis or Using Outposts for Memcached.

October 8, 2020

ElastiCache now supports Local Zones

A Local Zone is an extension of an Amazon Region that is geographically close to your users. You can extend any virtual private cloud (VPC) from a parent Amazon Region into Local Zones by creating a new subnet and assigning it to a Local Zone. For more information, see Using Local Zones.

September 25, 2020

ElastiCache now supports resource-level permissions

You can now restrict the scope of a user's permissions by specifying ElastiCache resources in an Amazon Identity and Access Management (IAM) policy. For more information, see Resource-level permissions.

August 12, 2020

ElastiCache now supports auto-update of ElastiCache clusters

Amazon ElastiCache now supports auto-update of ElastiCache clusters after the "recommended apply by date" of service update has passed. ElastiCache uses your maintenance window to schedule the automatic update of applicable clusters. For more information, see Self-service updates.

May 13, 2020

Amazon ElastiCache now supports T3-Standard cache nodes

You can now launch the next generation general-purpose burstable T3-Standard cache nodes in Amazon ElastiCache. Amazon EC2’s T3-Standard instances provide a baseline level of CPU performance with the ability to burst CPU usage at any time until the accrued credits are exhausted. For more information, see Supported Node Types.

November 12, 2019

ElastiCache for Memcached now allows users to apply service updates on their own schedule

With this feature, you can choose to apply available service updates at a time of your choosing and not just during maintenance windows. This will minimize service interruptions, particularly during peak business flows, and help ensure you remain compliant with security updates. For more information, see Self-Service Updates in Amazon ElastiCache.

October 9, 2019

Support for ElastiCache for Memcached 1.5.16

ElastiCache for Memcached now supports Memcached 1.5.16. It includes cumulative bug fixes from versions Memcached 1.5.14 and Memcached 1.5.15. For more information, see Memcached Version 1.5.16.

September 6, 2019

ElastiCache Standard Reserved Instance offerings: Partial Upfront, All Upfront and No Upfront.

Reserved Instances give you the flexibility to reserve an Amazon ElastiCache instance for a one- or three-year term based on an instance type and Amazon Region. For more information, see Managing Costs with Reserved Nodes.

January 18, 2019

Support for ElastiCache for Memcached 1.5.10

ElastiCache for Memcached now supports Memcached 1.5.10. It includes support for the no_modern and inline_ascii_resp parameters. For more information, see Memcached Version 1.5.10.

November 14, 2018

User Guide restructure

The single ElastiCache User Guide is now restructured so that there are separate user guides for Redis (ElastiCache for Redis User Guide) and for Memcached (ElastiCache for Memcached User Guide). The documentation structure in the Amazon CLI Command Reference: elasticache section and the Amazon ElastiCache API Reference remain unchanged.

April 20, 2018

ElastiCache added support for the Asia Pacific (Osaka-local) Region. The Asia Pacific (Osaka) Region currently supports a single Availability Zone and is by invitation only. For more information, see the following:

ElastiCache added support for the EU (Paris) Region. For more information, see the following:

Amazon ElastiCache added support for China (Ningxia) Region. For more information, see the following:

This release of ElastiCache added support for Service Linked Roles (SLR). For more information, see the following:

This release of ElastiCache added support R4 node types in all Amazon Regions supported by ElastiCache. You can purchase R4 node types as On-Demand or as Reserved Cache Nodes. For more information, see the following:

ElastiCache documentation adds a topic covering various patterns for accessing an ElastiCache cluster in an Amazon VPC.

For more information, see Access Patterns for Accessing an ElastiCache Cache in an Amazon VPC in the ElastiCache User Guide.

ElastiCache adds support Memcached version 1.4.34, which incorporates a number of fixes to earlier Memcached versions.

For more information, see Memcached 1.4.34 Release Notes at Memcached on GitHub.

ElastiCache adds support for Memcached version 1.4.33. For more information, see the following:

ElastiCache adds support for EU (London) Region. Only node types T2 and M4 are currently supported. For more information, see the following:

December 13, 2016

ElastiCache adds support for the Canada (Montreal) Region. Only node type M4 and T2 are currently supported in this Amazon Region. For more information, see the following:

ElastiCache adds support for R3 and M4 node types in South America (São Paulo) Region and M4 node types in China (Beijing) Region. For more information, see the following:

ElastiCache adds support for the US East (Ohio) Region (us-east-2) with M4, T2, and R3 node types. For more information, see the following:

ElastiCache adds support for the M4 family of node types in most Amazon Regions supported by ElastiCache. You can purchase M4 node types as On-Demand or as Reserved Cache Nodes. For more information, see the following:

ElastiCache adds support for the Asia Pacific (Mumbai) Region. For more information, see the following:

ElastiCache adds support for R3 node types in the China (Beijing) Region and South America (São Paulo) Region. For more information, see Supported cache node types.

Added a tutorial on configuring a Lambda function to access ElastiCache in an Amazon VPC. For more information, see ElastiCache tutorials and videos.

ElastiCache adds support for the Asia Pacific (Seoul) (ap-northeast-2) Region with t2, m3, and r3 node types.

January 6, 2016

ElastiCache adds support for Memcached version 1.4.24 and Memcached improvements since version 1.4.14. This release adds support for least recently used (LRU) cache management as a background task, choice of jenkins or murmur3 as your hashing algorithm, new commands, and miscellaneous bug fixes. For more information, see Memcached release notes

August 27, 2015

July 29, 2015

Added new topic on how to access ElastiCache resources from outside Amazon. For more information, see Accessing ElastiCache from outside Amazon.

July 9, 2015

ElastiCache adds three messages pertaining to scheduled node replacement, ElastiCache:NodeReplacementScheduled, ElastiCache:NodeReplacementRescheduled, and ElastiCache:NodeReplacementCanceled.

For more information and actions you can take when a node is scheduled for replacement, see ElastiCache's Event Notifications and Amazon SNS.

June 11, 2015

ElastiCache adds support for cost allocation tags. For more information, see Monitoring costs with cost allocation tags.

February 9, 2015

ElastiCache adds support for the Amazon GovCloud (US-West) (us-gov-west-1) Region.

January 29, 2015

ElastiCache adds support for the Europe (Frankfurt) (eu-central-1) Region.

January 19, 2015

Amazon CloudTrail logging of API calls supported

ElastiCache adds support for using Amazon CloudTrail to log all ElastiCache API calls. For more information, see Logging Amazon ElastiCache API calls with Amazon CloudTrail.

September 15, 2014

New instance sizes supported

ElastiCache adds support for additional General Purpose (T2) instances. For more information, see Configuring engine parameters using parameter groups.

September 11, 2014

ElastiCache adds support for creating Memcached nodes across multiple Availability Zones.

July 23, 2014

ElastiCache adds support for additional General Purpose (M3) instances and Memory Optimized (R3) instances. For more information, see Configuring engine parameters using parameter groups.

July 1, 2014

Added support for PHP version 5.5 auto discovery.

May 13, 2014

Support for default Amazon Virtual Private Cloud (VPC)

In this release, ElastiCache is fully integrated with Amazon Virtual Private Cloud (VPC). For new customers, cache clusters are created in an Amazon VPC by default. For more information, see Amazon VPCs and ElastiCache security.

January 8, 2013

PHP support for cache node auto discovery

The initial release of cache node auto discovery provided support for Java programs. In this release, ElastiCache brings cache node auto discovery support to PHP.

January 2, 2013

Support for Amazon Virtual Private Cloud (VPC)

In this release, ElastiCache clusters can be launched in Amazon Virtual Private Cloud (VPC). By default, new customers' cache clusters are created in an Amazon VPC automatically; existing customers can migrate to Amazon VPC at their own pace. For more information, see Amazon VPCs and ElastiCache security.

December 20, 2012

Cache node auto discovery and new cache engine version

ElastiCache provides cache node auto discovery—the ability for client programs to automatically determine all of the cache nodes in a cluster, and to initiate and maintain connections to all of these nodes.

This release also offers a new cache engine version: Memcached version 1.4.14. This new cache engine provides enhanced slab rebalancing capability, significant performance and scalability improvements, and several bug fixes. There are several new cache parameters that can be configured. For more information, see Configuring engine parameters using parameter groups.

November 28, 2012

New cache node types

This release provides four additional cache node types.

November 13, 2012

Reserved cache nodes

This release adds support for reserved cache nodes.

April 5, 2012

New guide

This is the first release of Amazon ElastiCache User Guide.

August 22, 2011