After deploying a Cloud Run service, it fails to start and logs indicate the container did not listen on the expected port. What is the most probable cause?

medium📝 Debug Q6 of 15

GCP - Cloud Run

AThe container does not listen on the port specified by the <code>PORT</code> environment variable.

BThe container image is missing the entrypoint command.

CThe Cloud Run service lacks sufficient CPU allocation.

DThe container is using an unsupported runtime environment.

Step-by-Step Solution

Solution:

Step 1: Understand Cloud Run port requirements
Cloud Run expects containers to listen on the port defined by the PORT environment variable.
Step 2: Identify cause of failure
If the container listens on a different port, Cloud Run cannot route traffic, causing startup failure.
Step 3: Eliminate other options
Missing entrypoint usually causes different errors; CPU allocation issues do not prevent startup; unsupported runtime would cause build or deploy errors.
Final Answer:
The container does not listen on the port specified by the PORT environment variable. -> Option A
Quick Check:
Container must listen on $PORT environment variable [OK]

Quick Trick: Container must listen on $PORT environment variable [OK]

Common Mistakes:

Ignoring the required listening port
Assuming CPU allocation causes startup failure
Confusing runtime errors with port issues

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After deploying a Cloud Run service, it fails to start and logs indicate the container did not listen on the expected port. What is the most probable cause?

Step 1: Understand Cloud Run port requirements

Step 2: Identify cause of failure

Step 3: Eliminate other options

Final Answer:

Quick Check:

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