Kubectl: Debug – Increase Verbosity

While troubleshooting Kubernetes-related issues it is useful to know how to increase the verbosity level of the main debugging tool – the kubectl command.

The verbosity of the kubectl command is controlled by the -v or --v flags followed by an integer from 0 to 9 that represents the log level.

In this note i will show how to increase the verbosity level of the kubectl command, that is extremely useful for debugging of the Kubernetes-related issues.

Cool Tip: Get Pod’s logs using the kubectl command! Read more →

Kubectl: Debug – Verbose Output

Use the following syntax of the kubectl command to set the verbosity level from 0 to 9:

$ kubectl <command> --v=<verbosity_level>

Examples:

# Minimum verbosity
$ kubectl cluster-info --v=0
# Debug level verbosity
$ kubectl cluster-info --v=4
# Maximum verbosity
$ kubectl cluster-info --v=9

All the available verbosity levels of the kubectl command:

Verbosity Description
--v=0 Generally useful for this to always be visible to a cluster operator.
--v=1 A reasonable default log level if you don’t want verbosity.
--v=2 Useful steady state information about the service and important log messages that may correlate to significant changes in the system. This is the recommended default log level for most systems.
--v=3 Extended information about changes.
--v=4 Debug level verbosity.
--v=5 Trace level verbosity.
--v=6 Display requested resources.
--v=7 Display HTTP request headers.
--v=8 Display HTTP request contents.
--v=9 Display HTTP request contents without truncation of contents.

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