You run kubectl exec -it mypod -c web -- /bin/bash but get the error: error: unable to upgrade connection: container not found. What is the likely cause?

medium📝 Troubleshoot Q6 of 15

Kubernetes - kubectl Essential Commands

You run kubectl exec -it mypod -c web -- /bin/bash but get the error: error: unable to upgrade connection: container not found. What is the likely cause?

AYou forgot to add the -i flag

BThe container name 'web' does not exist in the pod

CThe /bin/bash shell is missing in the container

DThe pod 'mypod' does not exist

Step-by-Step Solution

Solution:

Step 1: Analyze error message
The error says container not found, meaning the container name specified is incorrect or missing.
Step 2: Check other possibilities
If pod was missing, error would be different. Missing shell causes different error. Missing -i flag does not cause this error.
Final Answer:
The container name 'web' does not exist in the pod -> Option B
Quick Check:
Container not found error means wrong container name [OK]

Quick Trick: Verify container name matches exactly with pod containers [OK]

Common Mistakes:

Assuming pod does not exist without checking container name
Thinking missing shell causes container not found error

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You run kubectl exec -it mypod -c web -- /bin/bash but get the error: error: unable to upgrade connection: container not found. What is the likely cause?

Step 1: Analyze error message

Step 2: Check other possibilities

Final Answer:

Quick Check:

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