Smoke Testing Logs

Length: 00:01:56

Lesson Summary:

When managing a cluster, it is often necessary to access container logs to check their health and diagnose issues. Kubernetes offers access to container logs via the kubectl logs command. In this lesson, we will smoke test our cluster's ability to provide logs with kubectl logs. In order to do this, we will access the logs from our nginx container.

For this lesson, you will need to connect to cluster using kubectl. You can log in to one of your controller servers and use kubectl there, or you can run it from your local machine. To use kubectl from your local machine, you will need to open an SSH tunnel. You can open the SSH tunnel by running this in a separate terminal. Leave the session open while you are working to keep the tunnel active:

ssh -L 6443:localhost:6443 user@<your Load balancer cloud server public IP>

First, let's set an environment variable to the name of the nginx pod:

POD_NAME=$(kubectl get pods -l run=nginx -o jsonpath="{.items[0]}")

Get the logs from the nginx pod:

kubectl logs $POD_NAME

This command should return the nginx pod's logs. It will look something like this (but there could be more lines): - - [10/Sep/2018:19:29:01 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-"

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