Mi a különbség a continuous delivery és a continuous deployment között?

Question

Accepted Answer

Mind a **continuous delivery**, mind a **continuous deployment** automatizálja a release folyamatot és osztják a CD rövidítést, de egy kulcsfontosságú ponton különböznek: a **continuous delivery** készen tartja a kódot a telepítésre egy **manuális** release trigger segítségével, míg a **continuous deployment** **automatikusan** ad ki verziókat manuális lépés nélkül.

## Continuous Delivery — automatizált, manuálisan aktiválva

```text
CONTINUOUS DELIVERY: every change that passes the pipeline is ready to deploy, but
the actual production release is triggered MANUALLY (a human decision):
  Code → build → test → (auto-deploy to staging) → [MANUAL approval] → deploy to prod
  → code is ALWAYS in a deployable state; releasing is "one click" when you choose
  → keeps a human gate before production (approval, timing control)
```

## Continuous Deployment — teljesen automatizált

```text
CONTINUOUS DEPLOYMENT: every change that passes ALL pipeline stages is AUTOMATICALLY
deployed to production — NO manual step:
  Code → build → test → deploy to prod (automatically, if all checks pass)
  → the pipeline IS the only gate; passing tests = deployed
  → requires HIGH confidence in automated testing (no human safety check)
```

## A kulcsfontosságú különbség

```text
BOTH automate the pipeline; the difference is the FINAL production step:
  DELIVERY    → ready to deploy; a HUMAN decides when to release (manual trigger)
  DEPLOYMENT  → AUTOMATICALLY released on passing the pipeline (no human step)
→ Deployment goes one step further (fully automatic). Delivery keeps a manual gate.
```

## Választás közöttük

```text
CONTINUOUS DELIVERY → when you want control over release timing, manual approval,
  or testing/confidence isn't yet sufficient for fully-automatic prod releases
CONTINUOUS DEPLOYMENT → when you have strong automated tests and want maximum speed
  (every change live quickly) — requires mature testing and monitoring
```

## Miért fontos

A continuous delivery és a continuous deployment közötti különbség megértése értékes, mert gyakran összetévesztik őket (közös "CD" rövidítés), mégis az automatizálás különböző szintjeit képviselik, különböző követelményekkel, így tisztázásuk hasznos gyakorlati tudás.
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