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gcloud alpha compute connect-to-serial-port | Google Cloud SDK Documentation

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NAME

gcloud alpha compute connect-to-serial-port - connect to the serial port of an instance

SYNOPSIS

gcloud alpha compute connect-to-serial-port [USER@]INSTANCE [--dry-run] [--extra-args=KEY=VALUE,[KEY=VALUE,…]] [--force-key-file-overwrite] [--location=LOCATION] [--port=PORT; default=1] [--ssh-key-file=SSH_KEY_FILE] [--zone=ZONE] [--ssh-key-expiration=SSH_KEY_EXPIRATION     | --ssh-key-expire-after=SSH_KEY_EXPIRE_AFTER] [GCLOUD_WIDE_FLAG …]

DESCRIPTION

(ALPHA) gcloud alpha compute connect-to-serial-port allows users to connect to, and interact with, a VM's virtual serial port using ssh as the secure, authenticated transport protocol.

The user must first enable serial port access to a given VM by setting the 'serial-port-enable=true' metadata key-value pair. Setting 'serial-port-enable' on the project-level metadata enables serial port access to all VMs in the project.

This command uses the same SSH key pair as the gcloud compute ssh command and also ensures that the user's public SSH key is present in the project's metadata. If the user does not have a public SSH key, one is generated using ssh-keygen.

EXAMPLES

To connect to the serial port of the instance 'my-instance' in zone 'us-central1-f', run:

gcloud alpha compute connect-to-serial-port my-instance --zone=us-central1-f

POSITIONAL ARGUMENTS

[USER@]INSTANCE

Specifies the user/instance for the serial port connection.

USER specifies the username to authenticate as. If omitted, the current OS user is selected.

FLAGS

--dry-run

If provided, the ssh command is printed to standard out rather than being executed.

Optional arguments can be passed to the serial port connection by passing key-value pairs to this flag, such as max-connections=N or replay-lines=N. See https://cloud.google.com/compute/docs/instances/interacting-with-serial-console for additional options.

--force-key-file-overwrite

If enabled, the gcloud command-line tool will regenerate and overwrite the files associated with a broken SSH key without asking for confirmation in both interactive and non-interactive environments.

If disabled, the files associated with a broken SSH key will not be regenerated and will fail in both interactive and non-interactive environments.

--location=LOCATION

If provided, the region in which the serial console connection will occur. Must be the region of the VM to connect to.

--port=PORT; default=1

The number of the requested serial port. Can be 1-4, default is 1.

Instances can support up to four serial ports. By default, this command will connect to the first serial port. Setting this flag will connect to the requested serial port.

--ssh-key-file=SSH_KEY_FILE

The path to the SSH key file. By default, this is ~/.ssh/google_compute_engine.

--zone=ZONE

Zone of the instance to connect to. If not specified and the compute/zone property isn't set, you might be prompted to select a zone (interactive mode only).

To avoid prompting when this flag is omitted, you 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.

At most one of these can be specified:

--ssh-key-expiration=SSH_KEY_EXPIRATION

The time when the ssh key will be valid until, such as "2017-08-29T18:52:51.142Z." This is only valid if the instance is not using OS Login. See $ gcloud topic datetimes for information on time formats.

--ssh-key-expire-after=SSH_KEY_EXPIRE_AFTER

The maximum length of time an SSH key is valid for once created and installed, e.g. 2m for 2 minutes. See $ gcloud topic datetimes for information on duration formats.

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

This command is currently in alpha and might change without notice. If this command fails with API permission errors despite specifying the correct project, you might be trying to access an API with an invitation-only early access allowlist. These variants are also available:

gcloud compute connect-to-serial-port

gcloud beta compute connect-to-serial-port

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-05-07 UTC.

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