ElastiCache — Complete Guide
ElastiCache — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of AWS Cloud Tutorial on Toolliyo Academy.
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AWS Cloud Tutorial · Lesson 38 of 100
ElastiCache
Core services → Projects
Core services · 1 — AWS basics · ~6 min · AWS — Storage & Databases
What is this?
Amazon ElastiCache runs Redis or Memcached in-memory for caching, session storage, and pub/sub at microsecond latency.
Why should you care?
AwsVerse product catalog API caches hot SKUs in Redis to cut RDS read load 80%.
See it live — copy this example
Run in AWS CloudShell / local AWS CLI v2, or follow the matching steps in the AWS Console (Free Tier).
aws elasticache create-cache-cluster \
--cache-cluster-id awsverse-redis-lab \
--engine redis \
--cache-node-type cache.t3.micro \
--num-cache-nodes 1 \
--security-group-ids sg-redisWhat happened?
- Creates a single-node Redis cluster for lab.
- Production uses replication group with Multi-AZ and auth token enabled.
Practice next
- Create subnet group in private subnets.
- Launch cache.t3.micro Redis.
- From EC2: redis-cli -h endpoint ping.
- Enable transit encryption and AUTH token.
- Compare Redis vs Memcached for your access pattern.
Remember
ElastiCache = managed in-memory cache. Redis for structures and persistence. Place in private subnets only.
AwsVerse catalog cache
Homepage hits same 200 products.
Outcome: Redis cache drops p99 latency from 120 ms to 8 ms.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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