Docker - Swarm
How can you combine rolling updates with health checks to ensure only healthy containers are updated?
How can you combine rolling updates with health checks to ensure only healthy containers are updated?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand health checks in Docker services
Health checks monitor container status; Docker uses them to decide if a container is healthy.Step 2: Combine with rolling updates
When rolling updates run, Docker replaces only healthy containers; unhealthy ones are not updated until healthy.Final Answer:
Define health checks in the service and use rolling updates; unhealthy containers won't be replaced -> Option AQuick Check:
Health checks + rolling updates = safer updates [OK]
Quick Trick: Use health checks to prevent updating unhealthy containers [OK]
Common Mistakes:
- Assuming rolling updates ignore health checks
- Disabling health checks during updates
- Using manual restarts instead of rolling updates
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