What is Google Cloud IAM?

Google Cloud IAM is Google Cloud's identity and access management service, controlling who has what level of access to which resources through roles and policy bindings.

What's the difference between basic, predefined, and custom roles in Google Cloud IAM?

Basic roles are broad, legacy roles like Owner, Editor, and Viewer generally discouraged for production use; predefined roles are curated by Google with more targeted permissions for specific services; and custom roles let organizations define their own precise permission sets.

What is a service account in Google Cloud IAM?

A service account is a non-human identity used by applications and services to authenticate to Google Cloud APIs, functioning similarly to IAM roles in AWS or managed identities in Azure.

How does policy inheritance work in Google Cloud IAM?

IAM policies can be set at the organization, folder, project, or individual resource level, and generally inherit downward, meaning a policy set at a higher level applies to everything beneath it unless explicitly overridden.

How does Google Cloud IAM compare to AWS IAM?

Both provide fine-grained, policy-based access control for their respective clouds, but Google Cloud IAM is built around a resource hierarchy of organizations, folders, and projects with inherited policy bindings, while AWS IAM policies are typically attached more directly to users, groups, and roles.

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Google Cloud IAM

By Google Cloud

IntermediateService10.5K learners

Google Cloud IAM (Identity and Access Management) is Google Cloud Platform's service for controlling who has what access to which resources, using roles that bundle permissions and policy bindings that grant those roles to specific members.

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Definition

Overview

Google Cloud IAM governs access across Google Cloud, following a model built around three core concepts: members (users, groups, service accounts, or domains), roles (collections of permissions), and policy bindings that grant a role to a member on a specific resource. Google Cloud's resource hierarchy — organization, folders, projects, and individual resources — means IAM policies can be applied at different levels and are inherited downward, so a policy set at the organization level applies to every project beneath it unless overridden. Google Cloud IAM distinguishes between three types of roles: basic roles (broad, legacy roles like Owner, Editor, and Viewer that predate fine-grained IAM and are generally discouraged for production use), predefined roles (curated by Google for specific services, offering more targeted permissions), and custom roles (organizations can define their own precise permission sets). Service accounts are a particularly important IAM concept, functioning as non-human identities that applications and services use to authenticate to other Google Cloud APIs, similar in purpose to IAM roles in AWS or managed identities in Azure. Because permissions can be granted at any level of the resource hierarchy, understanding how bindings inherit and combine across organization, folder, and project levels is central to designing a secure, least-privilege Google Cloud environment, a topic commonly covered in Cloud Security training.

Key Features

Resource-hierarchy-aware access control (organization, folder, project, resource)
Basic, predefined, and custom roles for different levels of permission granularity
Policy bindings that grant roles to members on specific resources
Service accounts as non-human identities for application-to-API authentication
Policy inheritance down the resource hierarchy with override capability
Conditional IAM bindings based on attributes like time or resource type
Audit logging of IAM policy changes and access decisions
Integration with Google Workspace and external identity providers

Use Cases

Granting least-privilege access to engineers across GCP projects

Assigning service accounts to applications for secure API access

Applying consistent access policies across an entire organization via hierarchy

Creating custom roles for permissions not covered by predefined roles

Auditing who has access to sensitive resources and why

Enforcing conditional access rules based on context like time or resource attributes

Frequently Asked Questions

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