Manage GCP GKE Hub Membership IAM Bindings

The gcp:gkehub/membershipIamBinding:MembershipIamBinding resource, part of the Pulumi GCP provider, manages IAM role bindings for GKE Hub memberships by granting a specific role to a list of members. This guide focuses on two capabilities: authoritative role binding (which replaces all members for a role) and non-authoritative member addition (which preserves existing members).

IAM bindings reference existing GKE Hub memberships and require project and location identifiers. The examples are intentionally small. Combine them with your own membership resources and identity management strategy.

Note that MembershipIamBinding is authoritative for a given role: it replaces the entire member list for that role. It cannot be used with MembershipIamPolicy (which manages the entire policy), but can coexist with MembershipIamMember resources as long as they target different roles.

Grant a role to multiple members at once

When managing access to GKE Hub memberships, you often need to grant the same role to multiple users, service accounts, or groups.

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

const binding = new gcp.gkehub.MembershipIamBinding("binding", {
    project: membership.project,
    location: membership.location,
    membershipId: membership.membershipId,
    role: "roles/viewer",
    members: ["user:jane@example.com"],
});

import pulumi
import pulumi_gcp as gcp

binding = gcp.gkehub.MembershipIamBinding("binding",
    project=membership["project"],
    location=membership["location"],
    membership_id=membership["membershipId"],
    role="roles/viewer",
    members=["user:jane@example.com"])

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := gkehub.NewMembershipIamBinding(ctx, "binding", &gkehub.MembershipIamBindingArgs{
			Project:      pulumi.Any(membership.Project),
			Location:     pulumi.Any(membership.Location),
			MembershipId: pulumi.Any(membership.MembershipId),
			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.GkeHub.MembershipIamBinding("binding", new()
    {
        Project = membership.Project,
        Location = membership.Location,
        MembershipId = membership.MembershipId,
        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.gkehub.MembershipIamBinding;
import com.pulumi.gcp.gkehub.MembershipIamBindingArgs;
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 MembershipIamBinding("binding", MembershipIamBindingArgs.builder()
            .project(membership.project())
            .location(membership.location())
            .membershipId(membership.membershipId())
            .role("roles/viewer")
            .members("user:jane@example.com")
            .build());

    }
}

resources:
  binding:
    type: gcp:gkehub:MembershipIamBinding
    properties:
      project: ${membership.project}
      location: ${membership.location}
      membershipId: ${membership.membershipId}
      role: roles/viewer
      members:
        - user:jane@example.com

The role property specifies which permission set to grant (e.g., “roles/viewer”). The members array lists all identities that should have this role. This binding is authoritative: it replaces any existing members for this role on the membership. The membershipId, location, and project properties identify which membership to configure.

Add a single member to a role incrementally

To add one identity without affecting others who already have the role, use MembershipIamMember for non-authoritative updates.

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

const member = new gcp.gkehub.MembershipIamMember("member", {
    project: membership.project,
    location: membership.location,
    membershipId: membership.membershipId,
    role: "roles/viewer",
    member: "user:jane@example.com",
});

import pulumi
import pulumi_gcp as gcp

member = gcp.gkehub.MembershipIamMember("member",
    project=membership["project"],
    location=membership["location"],
    membership_id=membership["membershipId"],
    role="roles/viewer",
    member="user:jane@example.com")

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := gkehub.NewMembershipIamMember(ctx, "member", &gkehub.MembershipIamMemberArgs{
			Project:      pulumi.Any(membership.Project),
			Location:     pulumi.Any(membership.Location),
			MembershipId: pulumi.Any(membership.MembershipId),
			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.GkeHub.MembershipIamMember("member", new()
    {
        Project = membership.Project,
        Location = membership.Location,
        MembershipId = membership.MembershipId,
        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.gkehub.MembershipIamMember;
import com.pulumi.gcp.gkehub.MembershipIamMemberArgs;
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 MembershipIamMember("member", MembershipIamMemberArgs.builder()
            .project(membership.project())
            .location(membership.location())
            .membershipId(membership.membershipId())
            .role("roles/viewer")
            .member("user:jane@example.com")
            .build());

    }
}

resources:
  member:
    type: gcp:gkehub:MembershipIamMember
    properties:
      project: ${membership.project}
      location: ${membership.location}
      membershipId: ${membership.membershipId}
      role: roles/viewer
      member: user:jane@example.com

The member property (singular) specifies one identity to add. Unlike MembershipIamBinding, this resource preserves other members who already have the role. You can create multiple MembershipIamMember resources for the same role, and they’ll combine additively. This approach works well when different teams manage access for different users.

Beyond these examples

These snippets focus on specific IAM binding features: role-based access control and authoritative vs non-authoritative member management. They’re intentionally minimal rather than full access control configurations.

The examples reference pre-existing infrastructure such as GKE Hub memberships (referenced by membershipId) and Google Cloud projects and locations. They focus on configuring IAM bindings rather than provisioning the memberships themselves.

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

Conditional IAM bindings (condition property)
Full policy replacement (MembershipIamPolicy resource)
Custom role definitions
Federated identity configuration

These omissions are intentional: the goal is to illustrate how each IAM binding approach is wired, not provide drop-in access control modules. See the GKE Hub MembershipIamBinding resource reference for all available configuration options.

Let's manage GCP GKE Hub Membership IAM Bindings

Get started with Pulumi Cloud, then follow our quick setup guide to deploy this infrastructure.

Try Pulumi Cloud for FREE

Frequently Asked Questions

Resource Selection & Compatibility

What's the difference between MembershipIamPolicy, MembershipIamBinding, and MembershipIamMember?

MembershipIamPolicy is authoritative and replaces the entire IAM policy. MembershipIamBinding is authoritative for a specific role, preserving other roles in the policy. MembershipIamMember is non-authoritative, adding a single member to a role while preserving other members.

Can I use MembershipIamPolicy with MembershipIamBinding or MembershipIamMember?

No, MembershipIamPolicy cannot be used with MembershipIamBinding or MembershipIamMember because they will conflict over the policy configuration.

Can I use MembershipIamBinding and MembershipIamMember together?

Yes, but only if they manage different roles. Using both resources for the same role causes conflicts.

Configuration & Roles

How do I format custom roles?

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

What identity formats can I use in the members field?

The members field supports multiple formats: allUsers, allAuthenticatedUsers, user:{email}, serviceAccount:{email}, group:{email}, domain:{domain}, projectOwner:projectid, projectEditor:projectid, projectViewer:projectid, and federated identities like principal://iam.googleapis.com/....

What properties are immutable after creation?

The location, membershipId, project, role, and condition properties cannot be changed after the resource is created.

Import & Advanced Usage

What's the default location for a membership?

The default location is global. If not specified, the value is parsed from the parent resource identifier or taken from the provider configuration.

Using a different cloud?

Explore security guides for other cloud providers:

AWS Guides Azure Guides