Kubernetes - Production Best Practices
For upgrading a Kubernetes cluster with 100 worker nodes while ensuring zero downtime, which upgrade approach is most appropriate?
For upgrading a Kubernetes cluster with 100 worker nodes while ensuring zero downtime, which upgrade approach is most appropriate?
hard📝 Workflow Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand zero downtime requirement
Zero downtime means workloads must remain available during upgrade.Step 2: Use rolling upgrade strategy
Draining and upgrading nodes one at a time ensures workloads are rescheduled on healthy nodes, maintaining availability.Step 3: Avoid simultaneous upgrades
Upgrading all nodes at once risks service disruption.Final Answer:
Perform a rolling upgrade by draining and upgrading nodes one at a time -> Option CQuick Check:
Rolling upgrades minimize downtime [OK]
Quick Trick: Upgrade nodes sequentially to keep workloads available [OK]
Common Mistakes:
- Upgrading all nodes simultaneously causing downtime
- Recreating cluster causing service interruption
- Ignoring worker node upgrades
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