Manage GCP Compute Region Disk IAM Access

The gcp:compute/regionDiskIamMember:RegionDiskIamMember resource, part of the Pulumi GCP provider, manages IAM permissions for regional disks by granting roles to identities. This guide focuses on three approaches: single-member grants (non-authoritative), role-level bindings (authoritative per role), and full policy replacement (authoritative).

IAM resources for regional disks come in three variants that serve different use cases. RegionDiskIamMember adds one identity to a role without affecting others. RegionDiskIamBinding replaces all members for a specific role. RegionDiskIamPolicy replaces the entire policy. These resources cannot be used together without conflicts. The examples are intentionally small. Choose the approach that matches your IAM management strategy.

Grant a role to a single member

Most IAM configurations start by granting a specific role to one identity, preserving other members who already have the same role.

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 member property specifies one identity using formats like “user:jane@example.com” or “serviceAccount:app@project.iam.gserviceaccount.com”. The role property sets the permission level. This non-authoritative approach lets you add members incrementally without removing existing access.

Grant a role to multiple members at once

When multiple identities need the same role, binding them together ensures they’re managed as a group.

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

const binding = new gcp.compute.RegionDiskIamBinding("binding", {
    project: regiondisk.project,
    region: regiondisk.region,
    name: regiondisk.name,
    role: "roles/viewer",
    members: ["user:jane@example.com"],
});

import pulumi
import pulumi_gcp as gcp

binding = gcp.compute.RegionDiskIamBinding("binding",
    project=regiondisk["project"],
    region=regiondisk["region"],
    name=regiondisk["name"],
    role="roles/viewer",
    members=["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.NewRegionDiskIamBinding(ctx, "binding", &compute.RegionDiskIamBindingArgs{
			Project: pulumi.Any(regiondisk.Project),
			Region:  pulumi.Any(regiondisk.Region),
			Name:    pulumi.Any(regiondisk.Name),
			Role:    pulumi.String("roles/viewer"),
			Members: pulumi.StringArray{
				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 binding = new Gcp.Compute.RegionDiskIamBinding("binding", new()
    {
        Project = regiondisk.Project,
        Region = regiondisk.Region,
        Name = regiondisk.Name,
        Role = "roles/viewer",
        Members = new[]
        {
            "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.RegionDiskIamBinding;
import com.pulumi.gcp.compute.RegionDiskIamBindingArgs;
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 binding = new RegionDiskIamBinding("binding", RegionDiskIamBindingArgs.builder()
            .project(regiondisk.project())
            .region(regiondisk.region())
            .name(regiondisk.name())
            .role("roles/viewer")
            .members("user:jane@example.com")
            .build());

    }
}

resources:
  binding:
    type: gcp:compute:RegionDiskIamBinding
    properties:
      project: ${regiondisk.project}
      region: ${regiondisk.region}
      name: ${regiondisk.name}
      role: roles/viewer
      members:
        - user:jane@example.com

The members property takes an array of identities. This binding is authoritative for the specified role: it replaces all members for that role on the disk. Other roles remain unchanged. Use this when you want to define the complete member list for a specific role.

Replace the entire IAM policy

Some workflows require complete control over all roles and members, replacing any existing policy.

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 policyData property accepts a policy document from getIAMPolicy. The bindings array defines roles and their members. This approach is fully authoritative: it replaces the entire IAM policy. RegionDiskIamPolicy cannot be used with RegionDiskIamBinding or RegionDiskIamMember, as they will conflict over policy ownership.

Beyond these examples

These snippets focus on specific IAM management approaches: single-member grants (RegionDiskIamMember), role-level bindings (RegionDiskIamBinding), and full policy replacement (RegionDiskIamPolicy). They’re intentionally minimal rather than complete access control configurations.

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

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

Conditional IAM bindings (condition property)
Custom role definitions and formats
Federated identity configuration
Policy conflict resolution strategies

These omissions are intentional: the goal is to illustrate how each IAM resource type is wired, 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 IamBinding or IamMember?

No, gcp.compute.RegionDiskIamPolicy cannot be used with gcp.compute.RegionDiskIamBinding or gcp.compute.RegionDiskIamMember as they will conflict over policy control.

Can I use RegionDiskIamBinding and IamMember 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, IamBinding, and IamMember?

RegionDiskIamPolicy is authoritative and replaces the entire IAM policy. RegionDiskIamBinding is authoritative per role, replacing all members for that role while preserving other roles. RegionDiskIamMember is non-authoritative, adding a single member without affecting other members for the role.

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/....

How do I specify custom roles?

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

How do I import an existing IAM member?

Use space-delimited identifiers: resource path, role, and member identity. Example:

pulumi import gcp:compute/regionDiskIamMember:RegionDiskIamMember editor "projects/{{project}}/regions/{{region}}/disks/{{disk}} roles/viewer user:jane@example.com"

Resource Properties

What properties can't be changed after creation?

All input properties are immutable: member, name, project, region, role, and condition. Changes require resource replacement.

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