gcloud compute instances tail-serial-port-output

NAME: gcloud compute instances tail-serial-port-output - periodically fetch new output from a virtual machine instance's serial port and display it as it becomes available
SYNOPSIS: gcloud compute instances tail-serial-port-output INSTANCE_NAME [ --port = PORT ] [ --zone = ZONE ] [ GCLOUD_WIDE_FLAG … ]
DESCRIPTION: gcloud compute instances tail-serial-port-output is used to tail the output from a Compute Engine virtual machine instance's serial port. The serial port output from the instance will be printed to standard output. This information can be useful for diagnostic purposes.
EXAMPLES: To fetch new output from instance's serial port and display it, run:
gcloud compute instances tail-serial-port-output example-instance --zone = us-central1-b
POSITIONAL ARGUMENTS: INSTANCE_NAME

Name of the instance to operate on. For details on valid instance names, refer to the criteria documented under the field 'name' at: https://cloud.google.com/compute/docs/reference/rest/v1/instances
FLAGS: --port = PORT

Instances can support up to four serial port outputs, numbered 1 through 4. By default, this command will return the output of the first serial port. Setting this flag will return the output of the requested serial port.

--zone = ZONE

Zone of the instance to operate on. If not specified, you might be prompted to select a zone (interactive mode only). gcloud attempts to identify the appropriate zone by searching for resources in your currently active project. If the zone cannot be determined, gcloud prompts you for a selection with all available Google Cloud Platform zones.
To avoid prompting when this flag is omitted, the user can set the compute/zone property:

gcloud config set compute/zone ZONE

A list of zones can be fetched by running:

gcloud compute zones list

To unset the property, run:

gcloud config unset compute/zone

Alternatively, the zone can be stored in the environment variable CLOUDSDK_COMPUTE_ZONE .
GCLOUD WIDE FLAGS: These flags are available to all commands: --access-token-file , --account , --billing-project , --configuration , --flags-file , --flatten , --format , --help , --impersonate-service-account , --log-http , --project , --quiet , --trace-token , --user-output-enabled , --verbosity .
Run $ gcloud help for details.
NOTES: These variants are also available:
gcloud alpha compute instances tail-serial-port-output

gcloud beta compute instances tail-serial-port-output

gcloud preview compute instances tail-serial-port-output

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gcloud compute instances tail-serial-port-output