How can you ensure that a sidecar container starts only after the main container is healthy and running?

hard📝 Application Q9 of 15

Docker - Production Patterns

AThere is no way to control start order in Docker Compose

BUse Docker Compose healthchecks and depends_on with condition: service_healthy

CUse a shell script inside sidecar to wait for main container logs

DStart sidecar container manually after main container

Step-by-Step Solution

Solution:

Step 1: Understand Docker Compose start order controls
Docker Compose supports depends_on with healthcheck conditions to control start order.
Step 2: Evaluate options
Manual start is error-prone; shell script waiting is workaround; There is no way to control start order in Docker Compose is incorrect.
Final Answer:
Use Docker Compose healthchecks and depends_on with condition: service_healthy -> Option B
Quick Check:
Start order = depends_on with healthcheck [OK]

Quick Trick: Use depends_on with healthcheck for start order [OK]

Common Mistakes:

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