Koks yra skirtumas tarp nuolatinio kūrinio pristatymo ir nuolatinio diegimo?

Question

Accepted Answer

Tiek **nuolatinis kūrinio pristatymas**, tiek **nuolatinis diegimas** automatizuoja leidimo procesą ir dalija santrumpą CD, bet jie skiriasi vienu pagrindiniu aspektu: **nuolatinis kūrinio pristatymas** paruoštas kodą diegti su **rankinio** leidimo paleidimo mygtuku, o **nuolatinis diegimas** leidžia **automatiškai** be rankinio žingsnio.

## Nuolatinis kūrinio pristatymas — automatizuotas, rankiniu būdu paleidžiamas

```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)
```

## Nuolatinis diegimas — visiškai automatizuotas

```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)
```

## Pagrindinis skirtumas

```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.
```

## Pasirinkimas tarp jų

```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
```

## Kodėl tai svarbu

Supratimas apie skirtumą tarp nuolatinio kūrinio pristatymo ir nuolatinio diegimo yra vertingas, nes jie dažnai painiojami (dalijantis „CD