Intro

• Regional Service (all the nodes in the cluster must be in the same region)
• AWS managed caching service
• In-memory key-value store with sub-millisecond latency
• Need to provision EC2 instances (nodes for the cluster)
• Makes the application stateless because it doesn’t have to cache locally
• Using ElastiCache requires heavy application code changes
• Usage:
  • DB Cache (lazy loading): cache read operations on a database (reduced latency)
  • Session Store: store user's session data like cart info (allows the application to remain stateless)
  • Global Data Store: store intermediate computation results

Redis vs Memcached

Security & Access Management

• Network security is managed using Security Groups
• At rest encryption using KMS
• In-flight encryption using SSL
• Use Redis Auth to authenticate to ElastiCache for Redis
• Memcached supports SASL-based authentication

Modes of ElastiCache Replication for Redis

Cluster Mode Disabled