Which kubectl command correctly updates the image of a deployment named webapp to nginx:1.21 without downtime?
hard📝 Workflow Q8 of 15
Kubernetes - kubectl Essential Commands
Which kubectl command correctly updates the image of a deployment named webapp to nginx:1.21 without downtime?
Akubectl edit deployment webapp and change the image manually
Bkubectl set image deployment/webapp webapp=nginx:1.21
Ckubectl replace -f updated-deployment.yaml
Dkubectl rollout restart deployment/webapp
Step-by-Step Solution
Solution:
Step 1: Understand zero-downtime update
The kubectl set image command updates the image and triggers a rolling update.
Step 2: Evaluate options
kubectl set image deployment/webapp webapp=nginx:1.21 uses the correct syntax for updating the image directly. kubectl edit deployment webapp and change the image manually is manual and error-prone. kubectl replace -f updated-deployment.yaml replaces the entire deployment which may cause downtime. kubectl rollout restart deployment/webapp restarts pods but does not update the image.
Final Answer:
kubectl set image deployment/webapp webapp=nginx:1.21 -> Option B
Quick Check:
Does the command update the image and trigger a rolling update? [OK]
Quick Trick:Use 'kubectl set image' for seamless image updates [OK]
Common Mistakes:
Using rollout restart without changing image
Manually editing deployment risking errors
Replacing deployment causing downtime
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