You want to manage a deployment over time, updating its image and replicas safely without deleting it. Which command should you use and why?

hard📝 Best Practice Q15 of 15

Kubernetes - kubectl Essential Commands

AUse <code>kubectl create deployment myapp --image=nginx</code> repeatedly to update the deployment.

BUse <code>kubectl apply -f deployment.yaml</code> because it creates or updates resources safely.

CUse <code>kubectl delete deployment myapp</code> then <code>kubectl create -f deployment.yaml</code> to update.

DUse <code>kubectl replace -f deployment.yaml</code> because it creates new resources.

Step-by-Step Solution

Solution:

Step 1: Identify the need for safe updates over time
Managing a deployment means updating it multiple times without deleting or failing.
Step 2: Choose the command that supports create or update safely
kubectl apply can create or update resources safely, preserving existing settings and avoiding errors.
Step 3: Evaluate other options
kubectl create fails if resource exists; deleting is disruptive; replace overwrites but is less safe than apply.
Final Answer:
Use kubectl apply -f deployment.yaml because it creates or updates resources safely. -> Option B
Quick Check:
Manage resources over time with apply [OK]

Quick Trick: Apply manages updates safely; create is one-time only [OK]

Common Mistakes:

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