IAM policy for Spanner Instances

Three different resources help you manage your IAM policy for a Spanner instance. Each of these resources serves a different use case:

• google_spanner_instance_iam_policy: Authoritative. Sets the IAM policy for the instance and replaces any existing policy already attached.

Warning: It's entirely possibly to lock yourself out of your instance using google_spanner_instance_iam_policy. Any permissions granted by default will be removed unless you include them in your config.

• google_spanner_instance_iam_binding: Authoritative for a given role. Updates the IAM policy to grant a role to a list of members. Other roles within the IAM policy for the instance are preserved.
• google_spanner_instance_iam_member: Non-authoritative. Updates the IAM policy to grant a role to a new member. Other members for the role for the instance are preserved.

Note: google_spanner_instance_iam_policy cannot be used in conjunction with google_spanner_instance_iam_binding and google_spanner_instance_iam_member or they will fight over what your policy should be.

Note: google_spanner_instance_iam_binding resources can be used in conjunction with google_spanner_instance_iam_member resources only if they do not grant privilege to the same role.

google_spanner_instance_iam_policy

data "google_iam_policy" "admin" {
  binding {
    role = "roles/editor"

    members = [
      "user:[email protected]",
    ]
  }
}

resource "google_spanner_instance_iam_policy" "instance" {
  instance    = "your-instance-name"
  policy_data = "${data.google_iam_policy.admin.policy_data}"
}

google_spanner_instance_iam_binding

resource "google_spanner_instance_iam_binding" "instance" {
  instance  = "your-instance-name"
  role      = "roles/compute.networkUser"

  members = [
    "user:[email protected]",
  ]
}

google_spanner_instance_iam_member

resource "google_spanner_instance_iam_member" "instance" {
  instance  = "your-instance-name"
  role      = "roles/compute.networkUser"
  member    = "user:[email protected]"
}

Argument Reference

The following arguments are supported:

• instance - (Required) The name of the instance.

• member/members - (Required) Identities that will be granted the privilege in role. Each entry can have one of the following values:

  • allUsers: A special identifier that represents anyone who is on the internet; with or without a Google account.
  • allAuthenticatedUsers: A special identifier that represents anyone who is authenticated with a Google account or a service account.
  • user:{emailid}: An email address that represents a specific Google account. For example, [email protected] or [email protected].
  • serviceAccount:{emailid}: An email address that represents a service account. For example, [email protected].
  • group:{emailid}: An email address that represents a Google group. For example, [email protected].
  • domain:{domain}: A Google Apps domain name that represents all the users of that domain. For example, google.com or example.com.

• role - (Required) The role that should be applied. Only one google_spanner_instance_iam_binding can be used per role. Note that custom roles must be of the format [projects|organizations]/{parent-name}/roles/{role-name}.

• policy_data - (Required only by google_spanner_instance_iam_policy) The policy data generated by a google_iam_policy data source.

• project - (Optional) The ID of the project in which the resource belongs. If it is not provided, the provider project is used.

Attributes Reference

In addition to the arguments listed above, the following computed attributes are exported:

• etag - (Computed) The etag of the instance's IAM policy.

Import

For all import syntaxes, the "resource in question" can take any of the following forms:

• {{project}}/{{name}}
• {{name}} (project is taken from provider project)

IAM member imports use space-delimited identifiers; the resource in question, the role, and the account, e.g.

$ terraform import google_spanner_instance_iam_member.instance "project-name/instance-name roles/viewer [email protected]"

IAM binding imports use space-delimited identifiers; the resource in question and the role, e.g.

$ terraform import google_spanner_instance_iam_binding.instance "project-name/instance-name roles/viewer"

IAM policy imports use the identifier of the resource in question, e.g.

$ terraform import google_spanner_instance_iam_policy.instance project-name/instance-name