# Guided Exercise: Translate a Compose File Back Into Plain `docker run`

This is a paper exercise — commit to your translation before checking it in the Lab.

## Your task

Given this Compose service definition, write the equivalent plain `docker run` command by hand:

```yaml
services:
  web:
    image: nginx:alpine
    ports:
      - "8080:80"
```

Then explain: what would you ALSO need to do manually (that Compose does automatically) if two
services needed to reach each other by name?

## A worked shape to check yourself against

```
docker run -d -p 8080:80 nginx:alpine
```

For two services to reach each other by name manually, you'd need to `docker network create` a
shared network yourself, then add `--network <that-network>` to EACH container's `docker run`
command — exactly the manual step Compose eliminates.

## Instructor Notes

**Facilitation:** This exercise is the clearest possible proof that Compose isn't new magic —
being able to translate it back to `docker run` confirms genuine understanding, not just
familiarity with YAML syntax.

**Approximate timing:** 8-10 minutes live discussion; 5 minutes self-paced.