Piye cara auto scaling makarya ing AWS?

Question

Accepted Answer

**Auto Scaling** kanthi otomatis ngatur jumlah resource sing lagi mlaku (contone EC2 instances) adhedhasar permintaan — nambah kapasitas nalika beban mundhak lan nyilihake nalika beban mudhun. Iki penting kanggo mbangun aplikasi sing **reliable** (nangani paku traffic) lan **cost-efficient** (ora over-provision).

## Apa sing ditindakaken auto scaling

```text
Auto Scaling adjusts capacity AUTOMATICALLY based on demand:
  → load INCREASES (traffic spike) → add instances (scale OUT) → handle the load
  → load DECREASES → remove instances (scale IN) → save money
→ Match capacity to demand automatically: reliable under load, cheap when idle.
```

## EC2 Auto Scaling Groups (ASG)

```text
An AUTO SCALING GROUP manages a fleet of EC2 instances:
  MIN / MAX / DESIRED capacity → bounds and target number of instances
  LAUNCH TEMPLATE → how to launch new instances (AMI, type, config)
  SCALING POLICIES → rules for when to scale (see below)
  HEALTH CHECKS → replace unhealthy instances automatically (self-healing!)
  → typically spread across multiple AZs (high availability)
```

## Kebijakan scaling (kapan kudu scaling)

```text
TARGET TRACKING → keep a metric at a target (e.g. "keep average CPU at 50%") — simplest
STEP / SIMPLE SCALING → add/remove N instances when a metric crosses a threshold
SCHEDULED → scale at known times (e.g. more capacity during business hours)
PREDICTIVE → ML-based, anticipating load
→ Usually based on CloudWatch metrics (CPU, request count, custom metrics).
```

## Mengapa iku penting

```text
✓ RELIABILITY — handle traffic spikes automatically (no manual intervention, no overload)
✓ COST-EFFICIENCY — scale IN during low demand → don't pay for idle capacity
✓ SELF-HEALING — auto-replace failed instances (combined with health checks)
✓ Pairs with a LOAD BALANCER (distributes traffic across the scaled instances)
```

## Mengapa iku penting

Nangerteni auto scaling penting kanggo mbangun aplikasi sing reliable lan cost-efficient, dadi iku kaanggep praktis penting kanggo pangetahuan AWS.

Auto scaling ngatasi tantangan cloud fundamental: kecocokan kapasitas lawan **permintaan variable** kanthi otomatis — **nambah instances nalika beban mundhak** (nangani paku traffic tanpa intervensi manual utawa overload, njamin reliability) lan **nyilihake nalika beban mudhun** (ora bayar kanggo kapasitas sing nganggur, njamin cost-efficiency).

Manfaat dobel iki (reliability ing beban + penghematan biaya nalika nganggur) mrupakan inti saka nggunakake elasticity cloud, lan luwih apik tinimbang static provisioning kanggo peak load (mubazir) utawa kanggo average load (gagal ing paku).

Nangerteni **Auto Scaling Groups** (ngatur armada EC2 instances kanthi min/max/desired capacity, launch templates, lan health checks sing kanthi otomatis ngganti instances sing sakit kanggo **self-healing**) lan cara padane disebarake ing **multiple AZs** (nggabung scaling lawan high availability) iku pangetahuan praktis inti.

Nangerteni **scaling policies** (target tracking kanggo njaga metric kaya CPU ing target — paling sederhana lan paling umum; step scaling ing threshold; scheduled scaling kanggo pola sing dikenal; predictive scaling) adhedhasar CloudWatch metrics perlu kanggo nata scaling kanthi pas.

Ngetok yen auto scaling **berpasangan lawan load balancer** (sing nebar traffic ing saindhenging instances sing dinamis) ngrampungake gambare saka arsitektur sing scalable lan resilient.

Amarga nangani permintaan variable kanthi reliable lan cost-effective iku kabutuhan cloud inti, lan amarga auto scaling (lawan scaling groups, policies, health checks, lan load balancing) iku mekanisme sing nggayuh, nangerteni auto scaling penting, pangetahuan AWS praktis penting kanggo mbangun aplikasi sing scale lawan permintaan — kapabilitas fundamental kanggo reliable, cost-efficient cloud architecture lan topik utama kanggo desain sistem sing nangani traffic variable real-world.