gcloud alpha spanner instances set-iam-policy

NAME
gcloud alpha spanner instances set-iam-policy - set the IAM policy for a Cloud Spanner instance
SYNOPSIS
gcloud alpha spanner instances set-iam-policy[INSTANCE]POLICY_FILE[GCLOUD_WIDE_FLAG …]
DESCRIPTION
(ALPHA) Set the IAM policy for a Cloud Spanner instance given ainstance ID and a file encoded in JSON or YAML that contains the IAM policy.
EXAMPLES
The following command reads an IAM policy defined in a JSON filepolicy.json and sets it for a spanner instance with the IDexample-instance:
gcloudalphaspannerinstancesset-iam-policyexample-instancepolicy.json

Seehttps://cloud.google.com/iam/docs/managing-policiesfor details of the policy file format and contents.

POSITIONAL ARGUMENTS
Instance resource - The Spanner instance to set the IAM policy for. Thisrepresents a Cloud resource. (NOTE) Some attributes are not given arguments inthis group but can be set in other ways.

To set theproject attribute:

  • provide the argumentinstance on the command line with a fullyspecified name;
  • set the propertyspanner/instance with a fully specified name;
  • provide the argument--project on the command line;
  • set the propertycore/project.
[INSTANCE]
ID of the instance or fully qualified identifier for the instance.

To set theinstance attribute:

  • provide the argumentinstance on the command line;
  • set the propertyspanner/instance.
POLICY_FILE
Path to a local JSON or YAML formatted file containing a valid policy.

The output of theget-iam-policy command is a valid file, as is anyJSON or YAML file conforming to the structure of aPolicy.

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.

API REFERENCE
This command uses thespanner/v1 API. The full documentation forthis API can be found at:https://cloud.google.com/spanner/
NOTES
This command is currently in alpha and might change without notice. If thiscommand fails with API permission errors despite specifying the correct project,you might be trying to access an API with an invitation-only early accessallowlist. These variants are also available:
gcloudspannerinstancesset-iam-policy
gcloudbetaspannerinstancesset-iam-policy

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Last updated 2026-02-18 UTC.