Sheet 15
Cloud Infra Instance Catalog & Math
Standard cloud instance families, vCPU / RAM specifications, hourly rates, and live monthly costs for active cluster sizes.
| Workload Role | AWS Instance | vCPU | RAM | Rate ($/hr) | Active Count | Monthly Est. | Best Architectural Fit |
|---|---|---|---|---|---|---|---|
| Kafka Broker | m6i.2xlarge | 8 | 32 GB | $0.3840 | 3 | $841 | Steady high-throughput I/O |
| Kafka Broker XL | m6i.4xlarge | 16 | 64 GB | $0.7680 | 3 | $1,682 | Ultra high-throughput burst |
| API Gateway | c6i.xlarge | 4 | 8 GB | $0.1700 | 9 | $1,117 | CPU-bound TLS & rate limiting |
| App Microservice | c6i.xlarge | 4 | 8 GB | $0.1700 | 20 | $2,482 | Compute-optimized services |
| App Service (High Mem) | r6i.xlarge | 4 | 32 GB | $0.2520 | 3 | $552 | Search & cache-heavy microservices |
| Postgres Primary | r6i.2xlarge | 8 | 64 GB | $0.5040 | 1 | $368 | Memory-optimized primary ACID OLTP |
| Postgres Read Replica | r6i.xlarge | 4 | 32 GB | $0.2520 | 4 | $736 | Read-scale query offload |
| Redis Cluster Shard | cache.r6g.xlarge | 4 | 26 GB | $0.2260 | 3 | $495 | Managed Redis in-memory storage |
| OpenSearch Search Node | r6g.2xlarge | 8 | 64 GB | $0.4760 | 2 | $695 | Full-text search indexing |
| Bastion Host | t3.micro | 2 | 1 GB | $0.0104 | 1 | $8 | SSH jumping / ops management |