[Solved] Given this Docker Compose snippet, what will happen when you run docker-compose up? version: '3' services: app: image: myapp:latest logger: image: logcollector:latest depends_on: - app | Docker

Docker - Production Patterns

Given this Docker Compose snippet, what will happen when you run docker-compose up?

version: '3'
services:
  app:
    image: myapp:latest
  logger:
    image: logcollector:latest
    depends_on:
      - app

AOnly <code>app</code> container starts; <code>logger</code> is ignored

B<code>logger</code> starts before <code>app</code> container

C

Both <code>app</code> and <code>logger</code> containers start; <code>logger</code> waits for <code>app</code> to start first

DDocker Compose throws an error due to missing networks

Step-by-Step Solution

Solution:

Step 1: Analyze the Compose file services and dependencies
There are two services: app and logger. The logger service depends on app.
Step 2: Understand depends_on behavior
depends_on ensures app starts before logger, but both start when running docker-compose up.
Final Answer:
Both app and logger containers start; logger waits for app to start first -> Option C
Quick Check:
depends_on means start order, both containers run [OK]

Quick Trick: depends_on controls start order, not exclusion [OK]

Common Mistakes:

Master "Production Patterns" in Docker

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