Piye cara ngrancang high availability ing AWS?

Question

Accepted Answer

**High availability (HA)** tegese ngrancang sistem supaya tetep operasional sanajan ana kegagalan — liwat redundancy, multi-AZ deployment, auto-recovery, lan ngilangke single points of failure. Iki goal fundamental kanggo sistem production lan area kunci ing AWS architecture.

## Core HA principles

```text
✓ ELIMINATE SINGLE POINTS OF FAILURE — no single component whose failure takes down
  the system → redundancy everywhere (multiple instances, AZs, etc.)
✓ Deploy across MULTIPLE AVAILABILITY ZONES — survive an AZ (data center) failure
✓ AUTOMATIC RECOVERY — detect failures and recover/replace automatically (no manual fix)
✓ DECOUPLE components — failures isolated; one component's failure doesn't cascade
```

## HA techniques ing AWS

```text
COMPUTE → Auto Scaling Group across multiple AZs + Load Balancer
  → instances spread across AZs; LB health checks route around failures; ASG replaces
    failed instances → survives instance AND AZ failures
DATABASE → RDS Multi-AZ (synchronous standby in another AZ, auto-failover);
  read replicas; DynamoDB (multi-AZ by default)
STORAGE → S3 (multi-AZ durable by design); EBS snapshots
DNS → Route 53 failover routing + health checks (route to healthy/backup endpoints)
DECOUPLING → SQS queues (buffer; consumers can fail/retry without losing work)
```

## Lumantar siji region: multi-region

```text
For the HIGHEST availability (survive a whole REGION failure):
  → multi-REGION deployment (active-active or active-passive with failover)
  → much more complex/costly (data replication, routing, consistency) — for critical
    systems with strict availability requirements
→ Most systems: multi-AZ is the baseline; multi-region for the most critical.
```

## Kenapa penting

Ngerti carane ngrancang high availability iku pengetahuan penting level senior amarga **njaga sistem tetep operasional sanajan ana kegagalan iku requirement fundamental kanggo sistem production**, lan iku area kunci ing AWS architecture, dadi penting banget kanggo ngbangun cloud systems sing reliable.

**Core principles** — ngilangke single points of failure (liwat redundancy), deploy ing **multiple Availability Zones** (selamat saka data center failure), automatic recovery (deteksi lan recovery saka kegagalan tanpa intervensyon manual), lan decoupling components (isolate kegagalan) — nangkep mindset essential kanggo ngrancang for failure (nganggep components bakal gagal lan mesthia sistem selamat).

Ngerti **concrete HA techniques ing AWS** iku praktik core: nebar compute ing multiple AZs ing mburi load balancer karo auto scaling (selamat saka instance lan AZ failures), nggunake **RDS Multi-AZ** kanggo database failover, manfaatke built-in durability S3, nggunake Route 53 failover routing, lan decoupling karo SQS — iki padha-padha dadi architectures sing resilient dimana siji failure ora menyebabake outage.

**Multi-AZ deployment pattern** iku baseline kanggo HA (lan concept praktis paling penting), lan ngerti **multi-region** deployment (kanggo selamat saka bubar region failure — luwih kompleks lan larang, disimpen kanggo sistem paling kritis) nunjukke kesadaran marang spectrum requirements availability lan trade-offs-ne.

Ngrancang untuk HA iku sentral kanggo operate reliable production systems, lan garap karo bener (utawa salah) langsung determine apa sistem tetep up sak kegagalan.

Amarga high availability iku fundamental requirement kanggo production systems lan AWS nyedhiyake building blocks (multi-AZ, auto scaling, load balancing, Multi-AZ databases, failover routing) kanggo nggayuh iku, lan amarga ngerti carane padha-padha kanggo ngilangke single points of failure lan selamat saka kegagalan iku essential kanggo reliable architecture, ngerti carane ngrancang high availability ing AWS iku pengetahuan penting level senior — core architectural competency kanggo ngbangun production systems sing tetep operasyon sanajan inevitable failures, ngrefleksike reliability focus sing digarepke kanggo senior cloud roles.