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What Is Amazon Elasticache?

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What Is Amazon Elasticache? Amazon ElastiCache User Guide API Version 2015-02-02 Amazon ElastiCache User Guide Amazon ElastiCache: User Guide Copyright © 2015 Amazon Web Services, Inc. and/or its affiliates. All rights reserved. AWS services or capabilities described in AWS Documentation may vary by region/location. Click Getting Started with Amazon AWS to see specific differences applicable to the China (Beijing) Region. The following are trademarks of Amazon Web Services, Inc.: Amazon, Amazon Web Services Design, AWS, Amazon CloudFront, AWS CloudTrail, AWS CodeDeploy, Amazon Cognito, Amazon DevPay, DynamoDB, ElastiCache, Amazon EC2, Amazon Elastic Compute Cloud, Amazon Glacier, Amazon Kinesis, Kindle, Kindle Fire, AWS Marketplace Design, Mechanical Turk, Amazon Redshift, Amazon Route 53, Amazon S3, Amazon VPC, and Amazon WorkDocs. In addition, Amazon.com graphics, logos, page headers, button icons, scripts, and service names are trademarks, or trade dress of Amazon in the U.S. and/or other countries. Amazon©s trademarks and trade dress may not be used in connection with any product or service that is not Amazon©s, in any manner that is likely to cause confusion among customers, or in any manner that disparages or discredits Amazon. All other trademarks not owned by Amazon are the property of their respective owners, who may or may not be affiliated with, connected to, or sponsored by Amazon. AWS services or capabilities described in AWS Documentation may vary by region/location. Click Getting Started with Amazon AWS to see specific differences applicable to the China (Beijing) Region. Amazon ElastiCache User Guide Table of Contents What Is Amazon ElastiCache? ......................................................................................................... 1 Amazon ElastiCache Videos .................................................................................................... 2 Introductory Videos ........................................................................................................ 2 Advanced Videos .......................................................................................................... 2 Are You a First-Time ElastiCache User? .................................................................................... 3 Data Model .......................................................................................................................... 4 Cache Nodes ................................................................................................................ 4 Cache Cluster ............................................................................................................... 4 Cache Parameter Groups ............................................................................................... 4 Cache Replication Groups .............................................................................................. 4 Security ....................................................................................................................... 5 Supported Operations ............................................................................................................ 5 Cache Cluster Operations ............................................................................................... 5 Cache Node Parameter Operations .................................................................................. 5 Cache Replication Group Operations (Redis only) ............................................................... 6 Accessing Amazon ElastiCache ............................................................................................... 6 Regions and Endpoints .................................................................................................. 6 Supported Regions ................................................................................................................ 6 Getting Started with Amazon ElastiCache .......................................................................................... 8 Step 1: Before You Begin ........................................................................................................ 8 Step 2: Launch a Cluster ........................................................................................................ 8 Step 2: Launch a Memcached Cluster ............................................................................... 9 Step 2: Launch a Redis Cluster ...................................................................................... 12 Step 3: Authorize Access ...................................................................................................... 15 You Launched Your Cluster into EC2-VPC ........................................................................ 16 You Launched Your Cluster into EC2-Classic .................................................................... 17 Step 4: Connect to a Cluster Node .......................................................................................... 17 Step 4: Connect to a Memcached Node ........................................................................... 18 Step 4: Connect to a Redis Cluster ................................................................................. 19 Step 5: Delete Your Cache Cluster .......................................................................................... 21 Where Do I Go From Here? ................................................................................................... 21 Best Practices for Implementing Amazon ElastiCache ........................................................................ 22 Ensuring That You Have Sufficient Memory to Create a Redis Snapshot ........................................ 22 BGSAVE Process and Memory Usage ............................................................................ 22 Avoiding Running Out of Memory When Executing BGSAVE ............................................... 23 Fault Tolerance: AOF or Multi-AZ? .......................................................................................... 24 Enabling Redis AOF for Fault Tolerance ........................................................................... 24 Enabling Redis Multi-AZ as a Better Approach to Fault Tolerance ......................................... 24 Configuring Your ElastiCache Client for Efficient Load Balancing .................................................. 24 Consistent Hashing Using Java ...................................................................................... 25 Consistent Hashing Using PHP ...................................................................................... 25 Consistent Hashing Using .NET ..................................................................................... 25 ElastiCache Terminology and Concepts ........................................................................................... 26 Nodes ................................................................................................................................ 26 Node Considerations for Memcached .............................................................................. 27 Node Considerations for Redis ....................................................................................... 29 Reserved Nodes .......................................................................................................... 29 Replication Groups and Read Replicas (Redis) ......................................................................... 30 Primary Endpoint ......................................................................................................... 31 Creating a Replication Group ......................................................................................... 31 Adding a Redis Cache Cluster to a Replication Group ........................................................ 32 Multi-AZ with Redis Replication Groups ................................................................................... 32 Notes on Multi-AZ with Redis Replication Groups .............................................................. 32 Failure Scenarios and Multi-AZ Responses ...................................................................... 33 Enabling Redis Multi-AZ ................................................................................................ 35 API Version 2015-02-02 iii Amazon ElastiCache User Guide Backup and Restore for Redis Clusters .................................................................................... 38 Constraints ................................................................................................................. 39 Costs ......................................................................................................................... 39 Automatic Snapshots ................................................................................................... 39 Manual Snapshots ....................................................................................................... 39 Performance Impact of Snapshots .................................................................................. 40 Restoring From a Snapshot ........................................................................................... 40 Deleting Snapshots ...................................................................................................... 41 Clusters ............................................................................................................................. 41 Memcached
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