200-901 Application Deployment and Security Practice Question
In a Docker Compose file, a service 'web' depends on 'db'. The 'db' service uses a volume to persist data. Which compose key ensures that the database starts before the web service?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
depends_on
depends_on creates a startup order: Docker Compose starts 'db' before 'web'. It does not wait for 'db' to be ready; that requires healthchecks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
volumes
Why it's wrong here
volumes persist data, not order.
- ✓
depends_on
Why this is correct
depends_on ensures startup order.
- ✗
links
Why it's wrong here
links is legacy; still provides connectivity but not order.
- ✗
networks
Why it's wrong here
networks define network connectivity.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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