200-901 Application Deployment and Security Practice Question
In a Docker Compose file, you want to ensure that the 'web' service starts only after the 'db' service is healthy. Which key should you use under the 'web' service?
⚠ Common exam trap
Watch out — candidates often assume `depends_on` alone (without `condition: service_healthy`) guarantees the dependent service is ready, but it only waits for the container to start, not for it to be healthy.
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
In Docker Compose, the `depends_on` key with the `condition: service_healthy` option ensures that the `web` service starts only after the `db` service has passed its health check. This is defined in the `db` service using a `healthcheck` directive, and Compose waits for the healthy state before starting dependent services.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
networks
Why it's wrong here
networks defines network connections, not startup order.
- ✗
links
Why it's wrong here
links is deprecated and does not control startup order.
- ✓
depends_on
Why this is correct
depends_on with condition: service_healthy ensures the dependent service is healthy before starting.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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