AWS ElastiCache
Amazon ElastiCache provides fully managed Redis and Memcached in-memory data stores for sub-millisecond latency applications.
What is ElastiCache? (Simple Explanation)
Think of ElastiCache like keeping your most-used files on your desk instead of in a filing cabinet across the room. It remembers recent queries so your app responds in microseconds instead of milliseconds.
When Would You Use ElastiCache?
- Database query caching
- Real-time leaderboards & counting
- Session stores
- Message brokering with pub/sub
- Geospatial indexing
Who Uses ElastiCache?
From startups to enterprises, ElastiCache powers:
What Makes ElastiCache Powerful
ElastiCache Pricing & Free Tier
Free Tier: 750 hours/month of db.t2.micro (12 months), 20GB storage, 20GB backup. Pay-as-you-go from ~$0.017/hour.
ElastiCache Best Practices
- 1Enable Multi-AZ deployment for production workloads
- 2Encrypt at rest with KMS — all RDS/DynamoDB engines support it
- 3Set up automated backups with at least 7-day retention
- 4Use IAM database authentication instead of passwords where possible
- 5Monitor with Performance Insights and set CloudWatch alarms on CPU >80%
Getting Started with ElastiCache in 5 Minutes
- 1Open the AWS Console and navigate to ElastiCache
- 2Click "Create database" and choose your engine (or go serverless)
- 3Configure instance size, storage, and Multi-AZ deployment
- 4Set master username/password (use Secrets Manager for production) and click "Create"
ElastiCache CLI Quick Reference
2 production-ready commands. Full CLI Library (225+ services) →
aws elasticache describe-cache-clusters --query 'CacheClusters[*].{ID:CacheClusterId,Engine:Engine,Size:CacheNodeType,Status:CacheClusterStatus}' --output tableList all ElastiCache clustersaws elasticache describe-replication-groups --query 'ReplicationGroups[*].{ID:ReplicationGroupId,Primary:NodeGroups[0].PrimaryEndpoint.Address,Status:Status}'View Redis replication groups with primary endpointPros & Cons of ElastiCache
Pros
- Redis: replication, backup, clustering, data tiering
- Memcached: simple, multi-threaded performance
- Automatic failover with Multi-AZ
- Encryption at rest and in transit
- Online cluster resizing with no downtime
Cons
- ✕Managed databases cost more than self-hosted for predictable, steady workloads
- ✕Cold starts on serverless databases (Aurora Serverless) can impact latency-sensitive apps
- ✕Vendor lock-in risk — migrating large databases out of AWS is non-trivial
ElastiCache vs Alternatives
ElastiCache vs RDS
Choose ElastiCache for Database query caching and Real-time leaderboards & counting. It excels at redis: replication, backup, clustering, data tiering.
Choose RDS as an alternative when your requirements differ. Each service in the Database category serves different architectural patterns.
Services That Work with ElastiCache
ElastiCache is rarely used alone. It is typically combined with:
Compliance & Security
How AWS ElastiCache fits into major compliance standards. Browse all 41 frameworks →
ElastiCache configuration is audited by CIS Benchmarks v1.5–v3.0 for secure cloud defaults.
NIST 800-53ElastiCache access controls, encryption, and audit logging map to NIST 800-53 AC, SC, and AU control families.
PCI DSS 4.0ElastiCache encryption, access control, and logging support PCI DSS for cardholder data environments.
SOC 2ElastiCache security, availability, and confidentiality controls evaluated under SOC 2 Trust Services Criteria.
ISO 27001ElastiCache configuration and monitoring controls map to ISO 27001 Annex A information security management.
Frequently Asked Questions About ElastiCache
What is AWS ElastiCache?
Amazon ElastiCache provides fully managed Redis and Memcached in-memory data stores for sub-millisecond latency applications.
What is ElastiCache used for?
ElastiCache is commonly used for: Database query caching; Real-time leaderboards & counting; Session stores; Message brokering with pub/sub; Geospatial indexing. It's a core service in the database category of AWS.
Is ElastiCache free?
Free Tier: 750 hours/month of db.t2.micro (12 months), 20GB storage, 20GB backup. Pay-as-you-go from ~$0.017/hour.
What are the key features of ElastiCache?
ElastiCache's most important capabilities include: Redis: replication, backup, clustering, data tiering. Memcached: simple, multi-threaded performance. Automatic failover with Multi-AZ. Encryption at rest and in transit. Online cluster resizing with no downtime. Each of these is designed to help teams database query caching.
How does ElastiCache compare to alternatives?
ElastiCache competes with both AWS-native alternatives (RDS, EC2, CloudWatch) and third-party equivalents. The right choice depends on your specific requirements for scalability, cost, and operational overhead. See the comparisons section below for detailed guidance.
Which compliance frameworks apply to ElastiCache?
CIS AWS v3.0: ElastiCache configuration is audited by CIS Benchmarks v1.5–v3.0 for secure cloud defaults. NIST 800-53: ElastiCache access controls, encryption, and audit logging map to NIST 800-53 AC, SC, and AU control families. PCI DSS 4.0: ElastiCache encryption, access control, and logging support PCI DSS for cardholder data environments. SOC 2: ElastiCache security, availability, and confidentiality controls evaluated under SOC 2 Trust Services Criteria. ISO 27001: ElastiCache configuration and monitoring controls map to ISO 27001 Annex A information security management.
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