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사용 / 도메인 모델 reference

24 framework · 57 시나리오 · 13개 운영 패턴 · 7가지 배포 방식 — 시뮬레이터에서 즉시 만져볼 수 있는 모든 것의 reference.

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Intro
What serversim is — and what it is not
5-min quickstart
Run your first scenario and tweak knobs
Core concepts
Four-layer model / Workload / Edge / Snapshot

Framework 카탈로그

Web Server
NGINX
CDN
Edge cache (PoP, origin fetch)
Load Balancer
HAProxy (roundrobin / leastconn / source)
Auth / SSO
Keycloak (OAuth2, JWT cache, MFA)
Application
Spring Tomcat/WebFlux / FastAPI / Express / Django
Database
MySQL / PostgreSQL / MongoDB / Cassandra / CockroachDB
Vector DB
pgvector (HNSW / IVF, RAG)
Cache
Redis / Memcached
Message Broker
Kafka / RabbitMQ / Redis Streams
Stream Processing
Apache Flink (stateful, exactly-once)
Search & Index
Elasticsearch
Analytics (OLAP)
ClickHouse
Object Storage
Object Storage (HTTP)
Workflow
Temporal (durable workflow)
Observability
Prometheus (TSDB)

운영 패턴

Circuit Breaker
Resilience4j-style (closed / open / half-open)
Retry + Backoff
exponential + jitter, paired with CB
Bulkhead
Isolated concurrent calls (semaphore)
Client Timeout
RestTemplate.readTimeout model
HPA Auto-scaling
CPU threshold + cooldown
Rate Limit
NGINX limit_req token bucket
Health Probe
Readiness + failure threshold
Sidecar (Service Mesh)
Envoy / Linkerd, mTLS
DB Replication
Primary / replica + dynamic lag
Outbox Pattern
DB write + broker publish atomically
CQRS
Command / query separation
Saga (choreography / orchestration)
Distributed transactions
Hot Key Lock
DB row-level serialization

배포 방식

Rolling Update
K8s default, 25% step
Canary
10% v2 + automated Flagger-style gate
Blue-Green
LB switch + DB migration safety
Shadow
LB mirror + drop response
A/B Test
50/50 split + business metric
Feature Flag
Deploy ≠ release
Dark Launch
v1 response + async v2 compare

시나리오 카테고리

⭐ Featured
8 featured scenarios
🌱 Basics
3-tier / cached / GC / pool
🎓 Interview classics
URL shortener / chat / video / mobility / social feed + Saga / CQRS / Outbox
⚠ Pitfalls
"just add more servers?" — 6 traps
🚀 Ops patterns
Canary / Blue-Green / Rolling / Shadow / A-B / Feature flag
🌍 Large-scale / distributed
Multi-region / sharded / ELK / OLAP / CDN
📨 Broker
Kafka / RabbitMQ / Redis Streams
🎯 Evolution
MVP → cache + replica → async

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