Apa iku strategi deployment sing umum (blue-green, canary, rolling)?

Question

Accepted Answer

**Strategi deployment** nentokake cara rilis versi anyar menyang production — menimbang **safety**, **downtime**, lan **risk**. Strategi sing umum kalebu **rolling**, **blue-green**, lan **canary** deployments, saben-sabenipun duwe trade-offs sing beda.

## Rolling deployment

```text
Gradually replace old instances with new ones, a few at a time:
  [v1][v1][v1][v1] → [v2][v1][v1][v1] → [v2][v2][v1][v1] → ... → [v2][v2][v2][v2]
  ✓ no downtime (some instances always serving); no extra full environment needed
  ✗ both versions run during the rollout; slower; rollback = roll back instance by instance
```

## Blue-green deployment

```text
Run TWO identical environments — BLUE (current) and GREEN (new version):
  → deploy v2 to GREEN; test it; then SWITCH all traffic from blue to green at once
  → BLUE stays as instant rollback (switch back if green has issues)
  ✓ instant switch; instant rollback; test green before going live; no in-between state
  ✗ needs DOUBLE the infrastructure (two full environments)
```

## Canary deployment

```text
Release the new version to a SMALL subset of users first, then gradually increase:
  → 5% of traffic → v2 (monitor errors/metrics) → 25% → 50% → 100% if healthy
  → if problems appear, roll back having affected only a few users
  ✓ limits blast radius (catch issues with minimal impact); data-driven gradual rollout
  ✗ more complex (traffic splitting, monitoring); slower full rollout
```

## Memilih

```text
ROLLING → simple, no extra infra, gradual (a common default)
BLUE-GREEN → instant switch + instant rollback, safe testing (if you can afford 2x infra)
CANARY → safest for risky changes (limit blast radius), needs good monitoring
→ Choose by risk tolerance, infrastructure, and monitoring maturity.
```

## Pawalan pentinge

Ngerteni strategi deployment iku berharga kanggo **nilis software kanthi aman kanthi risiko lan downtime minimal**, mulane iku pengetahuan praktis sing penting kanggo deployment production.

Cara versi anyar dirilis menyang production kanthi signifikan mengaruhi safety lan risk, lan strategi-strategi kasebut nawakake trade-offs sing beda. **Rolling deployment** (perlahan ngganti instance lawas karo sing anyar) nyediakake zero-downtime releases tanpa infrastruktur tambahan, defaulte sing umum lan gampang, sanadyan loro-loro versi ngandal suwene rollout. **Blue-green deployment** (njalanake rong lingkungan identik lan ngalihake traffic saka sing saiki menyang versi anyar ing sakaligus) ngaktifake **switching langsung lan langsung rollback** (ngalihake balik menyang lingkungan lawas yen ana masalah) plus kemampuan kanggo test versi anyar sadurunge live, kanthi tuku kudu rong kali infrastruktur — berharga nalika rollback cepet lan pre-switch testing penting. **Canary deployment** (nilis menyang subset cilik user dhisik, monitoring, banjur naik banjur) iku **paling aman kanggo owahan sing berisiko** amarga iku **mbatesi blast radius** — ketokan masalah sanadyan hanay pengaruhi ping-ping user sadurunge full rollout — sanadyan iku butuh traffic splitting lan monitoring sing apik.

Ngerteni strategi-strategi kasebut lan **milih kanthi cocok** (rolling kanggo kesederhanaan, blue-green kanggo instant rollback lan aman testing yen infrastruktur ngidini, canary kanggo owahan berisiko kanthi monitoring sing apik) adhedhasar risk tolerance, infrastruktur, lan monitoring maturity nggambarake keputusan deployment sing bener.

Strategi-strategi ini adalah carane tim nggayuh rilis sing aman, low-downtime, low-risk — penting kanggo operasi production sing reliable.

Kawisata nilis software menyang production kanthi aman (nyilakake downtime lan risiko) iku kekhawatiran kritis lan strategi-strategi deployment nawakake trade-offs sing beda kanggo nggayuhi, lan amarga ngerteni rolling, blue-green, lan canary deployments lan kapan nggunakake saben-sabenipun ngaktifake rilis sing aman, ngerteni strategi deployment iku berharga, pengetahuan praktis-penting kanggo software delivery production — topik kunci kanggo nilis owahan kanthi reliable lan aman, nggambarake ngerti carane ndhudhung risiko sing ana ing deployment menyang production.