Manage GCP Compute Region Disk IAM Access

The gcp:compute/regionDiskIamMember:RegionDiskIamMember resource, part of the Pulumi GCP provider, grants IAM permissions on regional disks by adding individual members to roles without affecting other permissions. This guide focuses on non-authoritative member grants that preserve existing access.

GCP provides three resources for managing regional disk IAM: RegionDiskIamPolicy (replaces entire policy), RegionDiskIamBinding (manages all members for one role), and RegionDiskIamMember (adds one member to one role). RegionDiskIamPolicy cannot be used with the other two; RegionDiskIamBinding and RegionDiskIamMember can coexist if they manage different roles. The examples are intentionally small. Combine them with your own disk resources and access requirements.

Replace the entire IAM policy for a disk

When you need complete control over disk permissions, you can set the entire IAM policy at once.

import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";

const admin = gcp.organizations.getIAMPolicy({
    bindings: [{
        role: "roles/viewer",
        members: ["user:jane@example.com"],
    }],
});
const policy = new gcp.compute.RegionDiskIamPolicy("policy", {
    project: regiondisk.project,
    region: regiondisk.region,
    name: regiondisk.name,
    policyData: admin.then(admin => admin.policyData),
});

import pulumi
import pulumi_gcp as gcp

admin = gcp.organizations.get_iam_policy(bindings=[{
    "role": "roles/viewer",
    "members": ["user:jane@example.com"],
}])
policy = gcp.compute.RegionDiskIamPolicy("policy",
    project=regiondisk["project"],
    region=regiondisk["region"],
    name=regiondisk["name"],
    policy_data=admin.policy_data)

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/compute"
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/organizations"
	"github.com/pulumi/pulumi/sdk/v3/go/pulumi"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		admin, err := organizations.LookupIAMPolicy(ctx, &organizations.LookupIAMPolicyArgs{
			Bindings: []organizations.GetIAMPolicyBinding{
				{
					Role: "roles/viewer",
					Members: []string{
						"user:jane@example.com",
					},
				},
			},
		}, nil)
		if err != nil {
			return err
		}
		_, err = compute.NewRegionDiskIamPolicy(ctx, "policy", &compute.RegionDiskIamPolicyArgs{
			Project:    pulumi.Any(regiondisk.Project),
			Region:     pulumi.Any(regiondisk.Region),
			Name:       pulumi.Any(regiondisk.Name),
			PolicyData: pulumi.String(admin.PolicyData),
		})
		if err != nil {
			return err
		}
		return nil
	})
}

using System.Collections.Generic;
using System.Linq;
using Pulumi;
using Gcp = Pulumi.Gcp;

return await Deployment.RunAsync(() => 
{
    var admin = Gcp.Organizations.GetIAMPolicy.Invoke(new()
    {
        Bindings = new[]
        {
            new Gcp.Organizations.Inputs.GetIAMPolicyBindingInputArgs
            {
                Role = "roles/viewer",
                Members = new[]
                {
                    "user:jane@example.com",
                },
            },
        },
    });

    var policy = new Gcp.Compute.RegionDiskIamPolicy("policy", new()
    {
        Project = regiondisk.Project,
        Region = regiondisk.Region,
        Name = regiondisk.Name,
        PolicyData = admin.Apply(getIAMPolicyResult => getIAMPolicyResult.PolicyData),
    });

});

package generated_program;

import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.gcp.organizations.OrganizationsFunctions;
import com.pulumi.gcp.organizations.inputs.GetIAMPolicyArgs;
import com.pulumi.gcp.compute.RegionDiskIamPolicy;
import com.pulumi.gcp.compute.RegionDiskIamPolicyArgs;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;

public class App {
    public static void main(String[] args) {
        Pulumi.run(App::stack);
    }

    public static void stack(Context ctx) {
        final var admin = OrganizationsFunctions.getIAMPolicy(GetIAMPolicyArgs.builder()
            .bindings(GetIAMPolicyBindingArgs.builder()
                .role("roles/viewer")
                .members("user:jane@example.com")
                .build())
            .build());

        var policy = new RegionDiskIamPolicy("policy", RegionDiskIamPolicyArgs.builder()
            .project(regiondisk.project())
            .region(regiondisk.region())
            .name(regiondisk.name())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:compute:RegionDiskIamPolicy
    properties:
      project: ${regiondisk.project}
      region: ${regiondisk.region}
      name: ${regiondisk.name}
      policyData: ${admin.policyData}
variables:
  admin:
    fn::invoke:
      function: gcp:organizations:getIAMPolicy
      arguments:
        bindings:
          - role: roles/viewer
            members:
              - user:jane@example.com

The RegionDiskIamPolicy resource replaces all existing permissions on the disk. The getIAMPolicy data source constructs the policy from bindings that specify roles and members. This approach is authoritative: any permissions not listed in policyData are removed.

Grant a role to a single member

Most access grants add one identity to one role without changing other permissions.

import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";

const member = new gcp.compute.RegionDiskIamMember("member", {
    project: regiondisk.project,
    region: regiondisk.region,
    name: regiondisk.name,
    role: "roles/viewer",
    member: "user:jane@example.com",
});

import pulumi
import pulumi_gcp as gcp

member = gcp.compute.RegionDiskIamMember("member",
    project=regiondisk["project"],
    region=regiondisk["region"],
    name=regiondisk["name"],
    role="roles/viewer",
    member="user:jane@example.com")

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/compute"
	"github.com/pulumi/pulumi/sdk/v3/go/pulumi"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := compute.NewRegionDiskIamMember(ctx, "member", &compute.RegionDiskIamMemberArgs{
			Project: pulumi.Any(regiondisk.Project),
			Region:  pulumi.Any(regiondisk.Region),
			Name:    pulumi.Any(regiondisk.Name),
			Role:    pulumi.String("roles/viewer"),
			Member:  pulumi.String("user:jane@example.com"),
		})
		if err != nil {
			return err
		}
		return nil
	})
}

using System.Collections.Generic;
using System.Linq;
using Pulumi;
using Gcp = Pulumi.Gcp;

return await Deployment.RunAsync(() => 
{
    var member = new Gcp.Compute.RegionDiskIamMember("member", new()
    {
        Project = regiondisk.Project,
        Region = regiondisk.Region,
        Name = regiondisk.Name,
        Role = "roles/viewer",
        Member = "user:jane@example.com",
    });

});

package generated_program;

import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.gcp.compute.RegionDiskIamMember;
import com.pulumi.gcp.compute.RegionDiskIamMemberArgs;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;

public class App {
    public static void main(String[] args) {
        Pulumi.run(App::stack);
    }

    public static void stack(Context ctx) {
        var member = new RegionDiskIamMember("member", RegionDiskIamMemberArgs.builder()
            .project(regiondisk.project())
            .region(regiondisk.region())
            .name(regiondisk.name())
            .role("roles/viewer")
            .member("user:jane@example.com")
            .build());

    }
}

resources:
  member:
    type: gcp:compute:RegionDiskIamMember
    properties:
      project: ${regiondisk.project}
      region: ${regiondisk.region}
      name: ${regiondisk.name}
      role: roles/viewer
      member: user:jane@example.com

The RegionDiskIamMember resource adds a single member to a role. The member property accepts various identity formats: user emails, service accounts, groups, domains, or federated identities. This approach is non-authoritative: other members in the same role and all other roles remain unchanged.

Beyond these examples

These snippets focus on specific IAM management approaches: authoritative policy replacement and non-authoritative member grants. They’re intentionally minimal rather than complete access control configurations.

The examples reference pre-existing infrastructure such as regional disks (by project, region, and name). They focus on IAM binding configuration rather than disk provisioning.

To keep things focused, common IAM patterns are omitted, including:

Conditional IAM bindings (condition property)
RegionDiskIamBinding for role-level management
Custom role format requirements
Service account and federated identity formats

These omissions are intentional: the goal is to illustrate how each IAM resource type works, not provide drop-in access control modules. See the RegionDiskIamMember resource reference for all available configuration options.

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Frequently Asked Questions

Resource Selection & Conflicts

Can I use RegionDiskIamPolicy with RegionDiskIamBinding or RegionDiskIamMember?

No, gcp.compute.RegionDiskIamPolicy cannot be used with gcp.compute.RegionDiskIamBinding or gcp.compute.RegionDiskIamMember because they will conflict over the policy configuration.

Can I use RegionDiskIamBinding and RegionDiskIamMember together?

Yes, but only if they don’t grant privileges to the same role. Each role must be managed by only one resource type.

What's the difference between RegionDiskIamPolicy, RegionDiskIamBinding, and RegionDiskIamMember?

gcp.compute.RegionDiskIamPolicy is authoritative and replaces the entire IAM policy. gcp.compute.RegionDiskIamBinding is authoritative for a specific role but preserves other roles. gcp.compute.RegionDiskIamMember is non-authoritative and adds a single member to a role while preserving other members.

IAM Configuration

What member identity formats are supported?

Supported formats include allUsers, allAuthenticatedUsers, user:{email}, serviceAccount:{email}, group:{email}, domain:{domain}, projectOwner:{projectid}, projectEditor:{projectid}, projectViewer:{projectid}, and federated identities like principal://iam.googleapis.com/locations/global/workforcePools/example-contractors/subject/joe@example.com.

How do I specify a custom role?

Custom roles must use the format [projects|organizations]/{parent-name}/roles/{role-name}, for example projects/my-project/roles/my-custom-role.

Resource Properties

Can I change the member, role, or region after creation?

No, all input properties (member, role, name, project, region) are immutable and cannot be changed after the resource is created.

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