Planned lessonJNR-050-L01

Compose files

Lesson 1 of 5
Junior

On This Lesson 4 topics

In this lesson
Planned topics
Draft outline details
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This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.

In this lesson

describe a multi-service environment in one file.

Planned topics

Compose runs several containers together from compose.yaml; one command starts or stops them all.
Each entry under services: is a container: image or build, ports, environment, volumes.
Compose creates a network for the project; services reach each other by service name.
Named volumes go under volumes:.
Commands: docker compose up -d, ps, logs -f, down (add -v to delete volumes).

Draft outline details

Demonstration

yaml

services:
  db:
    image: postgres:16
    environment:
      POSTGRES_PASSWORD: dev
    volumes: [pgdata:/var/lib/postgresql/data]
  app:
    build: .
    ports: ["8080:8080"]
volumes:
  pgdata:

Check your understanding

What does docker compose down -v do beyond down?

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It also deletes the named volumes and their data.

Practice

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