What is Amazon ElastiCache?
Welcome to the Amazon ElastiCache User Guide. Amazon ElastiCache is a web service that makes it easy to set up, manage, and scale a distributed in-memory data store or cache environment in the cloud. It provides a high-performance, scalable, and cost-effective caching solution. At the same time, it helps remove the complexity associated with deploying and managing a distributed cache environment.
You can operate Amazon ElastiCache in two formats. You can get started with a serverless cache or choose to design your own cache cluster.
Note
Amazon ElastiCache works with the Valkey, Redis OSS, and Memcached engines. If you're unsure which engine you want to use, see Comparing Valkey, Redis OSS, and Memcached self-designed caches in this guide.
Serverless caching
ElastiCache offers serverless caching, which simplifies adding and operating a cache for your application. ElastiCache Serverless enables you to create a highly available cache in under a minute, and eliminates the need to provision instances or configure nodes or clusters. Developers can create a Serverless cache by specifying the cache name using the ElastiCache console, SDK or CLI.
ElastiCache Serverless also removes the need to plan and manage caching capacity. ElastiCache constantly monitors the cache’s memory, compute, and network bandwidth used by your application, and scales to meet the needs of your application. ElastiCache offers a simple endpoint experience for developers, by abstracting the underlying cache infrastructure and cluster design. ElastiCache manages hardware provisioning, monitoring, node replacements, and software patching automatically and transparently, so that you can focus on application development, rather than operating the cache.
ElastiCache Serverless is compatible with Valkey 7.2 and above, Redis OSS 7.1, and Memcached 1.6.21 and above.
Designing your own ElastiCache cluster
If you need fine-grained control over your ElastiCache cluster, you can choose to design your own Valkey, Redis OSS or Memcached cluster with ElastiCache. ElastiCache enables you to design your cluster, by choosing the node-type, number of nodes, and node placement across AWS Availability Zones for your cluster. Since ElastiCache is a fully-managed service, it automatically manages hardware provisioning, monitoring, node replacements, and software patching for your cluster.
Designing your own ElastiCache cluster offers greater flexibility and control over your clusters. For example, you can choose to operate a cluster with single-AZ availability or multi-AZ availability depending on your needs. You can also choose to run Valkey, Redis OSS or Memcached in cluster mode enabling horizontal scaling, or without cluster mode for just scaling vertically. When designing your own clusters, you are responsible for choosing the type and number of nodes correctly to ensure that your cache has enough capacity as required by your application. You can also choose when to apply new software patches to your Valkey or Redis OSS cluster.
When designing your own ElastiCache cluster you can choose to run ElastiCache version 7.2 for Valkey and above, ElastiCache version 4.0 to 7.1 for Redis OSS, or ElastiCache version 1.4 for Memcached and above.
