Originally published on docker.learnio.dev — part of the Docker fundamentals course. View this lesson on the original site.

Why teams keep choosing Docker

By now you can run a container. The next question is why teams standardise on Docker instead of everyone hand-building PHP, MySQL, and Redis on their laptops.

Docker helps when:

several developers need the same runtime and extensions
the app depends on multiple services (web, database, cache, mail)
CI and local machines keep drifting apart
onboarding should not mean a two-hour setup call

It is less urgent for a one-file script with no dependencies — but most PHP products are not that small.

flowchart LR
    repo["Repo: Dockerfile + Compose"] --> dev["Developer laptop"]
    repo --> ci["CI pipeline"]
    ci --> registry["Registry"]
    registry --> staging["Staging"]
    registry --> prod["Production"]

Try it

Ask one question about your current project:

Could a teammate clone the repo and get close to the right runtime without asking whoever set up the last machine?

If the honest answer is no, Docker is probably worth the learning time.

If it goes wrong

“Docker is overkill” for a tiny tool: fair — use it where drift hurts.
“We only need Docker in prod”: many teams win first on local + CI parity, then production.

Remember

The payoff is a shareable runtime story in files, not magic containers.

From Docker fundamentals — Install Docker, see the value, and learn the basics