💾 ElastiCache Caching - Advanced

Multi-AZ Redis

# Create Multi-AZ cluster
aws elasticache create-cache-cluster \
  --cache-cluster-id my-cache \
  --engine redis \
  --cache-node-type cache.r6g.large \
  --multi-az

Cluster Mode

# Enable cluster mode
aws elasticache create-replication-group \
  --replication-group-description "Clustered cache" \
  --engine redis \
  --cache-node-type cache.r6g.large \
  --num-cache-clusters 3 \
  --automatic-failover-enabled

Pub/Sub Patterns

// Publish/Subscribe for real-time updates
client.on('subscribe', (channel, count) => {
  console.log(`Subscribed to ${channel}`);
});

client.subscribe('notifications', (err, count) => {
  if (err) console.error(err);
});

Key Takeaways

• **Multi-AZ** ensures availability

• **Cluster mode** scales horizontally

• **Pub/Sub** enables messaging

• **Monitoring** optimizes performance

Next Steps

Explore monitoring and advanced observability.