Is it possible to grep pod logs for the readiness test?

Question

I know this can be worked around by using exec and looking at a file inside the pod, e.g.

    readinessProbe:
      exec:
        command:
        - cat
        - /tmp/healthy

But want to know if there's any way to grep the logs collected by the kubelet (i.e. that you see with kubectl logs and fail readiness based on, for example, grepping for error?

Answer 1

In a Kubernetes environment, you can filter specific logs in pod using the following command:

This command retrieves the logs from the specified pod, searches for lines containing the word "error", and saves those lines to a file named app.log. This is a common way to filter logs and capture only the relevant information for debugging or analysis purposes.

If you intend to search logs within a container, it's necessary to construct an image and incorporate the kubectl command. For guidance on installing kubectl within a Kubernetes container via a Docker image, you can find the necessary information in the following article.

"After referring to the article, you can proceed to modify your YAML file by including the kubectl logs command."