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, controlling which identities can access membership resources. This guide focuses on two capabilities: authoritative role binding that replaces all members for a role, and incremental member addition that preserves existing grants.

IAM bindings reference existing GKE Hub memberships. MembershipIamBinding cannot be combined with MembershipIamPolicy resources, as they conflict over policy ownership. The examples are intentionally small. Combine them with your own membership infrastructure and identity management.

Grant a role to multiple members at once

Teams managing GKE Hub memberships 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

MembershipIamBinding is authoritative for the specified role: it replaces all members for that role with the list you provide. The members array accepts various identity formats including user emails, service accounts, groups, and federated identities. The membershipId, project, and location properties identify which membership to bind the policy to.

Add a single member to a role incrementally

When you need to grant access to one identity without affecting other members of the same role, MembershipIamMember provides 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

Unlike MembershipIamBinding, MembershipIamMember adds a single member to a role without replacing existing grants. This is useful when multiple teams manage access independently. The member property takes a single identity string, while role and membershipId work the same as in the binding resource.

Beyond these examples

These snippets focus on specific IAM binding features: role-based binding (authoritative for a role) and incremental member grants (non-authoritative). They’re intentionally minimal rather than full access control configurations.

The examples reference pre-existing infrastructure such as GKE Hub memberships. They focus on configuring IAM bindings rather than provisioning the underlying membership resources.

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

Full policy replacement (MembershipIamPolicy)
Conditional IAM bindings (condition property)
Custom role definitions
Policy data retrieval (data source)

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.

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Frequently Asked Questions

Resource Selection & Conflicts

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 but preserves other roles. MembershipIamMember is non-authoritative and preserves other members for the same role.

Can I use MembershipIamPolicy together with MembershipIamBinding or MembershipIamMember?

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

Can I use MembershipIamBinding and MembershipIamMember together?

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

Configuration & Identity Formats

What identity formats are supported in the members field?

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

What format do custom roles need to follow?

Custom roles must use the format [projects|organizations]/{parent-name}/roles/{role-name}.

What's the default location for a membership?

The default location is global if not specified in the resource or parent identifier.

Immutability & Lifecycle

What properties can't be changed after creation?

The role, membershipId, project, and location properties are all immutable after creation.

Can I use only one MembershipIamBinding per role?

Yes, only one MembershipIamBinding can be used per role.

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