Objective: Ensure that the analytics workload on Compute Engine instances accessing Cloud Storage does not interact with the public internet.
Solution:
Private Google Access: This allows Compute Engine instances that only have internal IP addresses to reach Google APIs and services through a private connection without the need for a public IP address.
No Public IP Addresses: By avoiding public IP addresses for the instances, you ensure that they are not accessible from the internet and do not initiate internet connections.
Steps:
Step 1: Open the Google Cloud Console.
Step 2: Navigate to the VPC Network page and select the subnet where the Compute Engine instances are located.
Step 3: Enable Private Google Access for the subnet.
Step 4: Ensure that when launching the Compute Engine instances, no public IP addresses are assigned to them.
Reference:
Configuring Private Google Access
Preventing External IP Address Assignment

To grant an IAM user access to HTTPS resources protected by Identity-Aware Proxy (IAP), you should assign the IAP-Secured Web App User role.
IAP-Secured Web App User (C):
This role grants the necessary permissions for a user to access web applications secured by IAP. It includes permissions to access the IAP-secured resources, ensuring that users can authenticate and gain the appropriate access based on the policies defined in IAP.
Assigning this role ensures that users have the right level of access to protected web resources, aligned with the security controls enforced by IAP.
Reference:
Identity-Aware Proxy Documentation
IAP Roles and Permissions

To delegate management of access control permissions to each business unit effectively, organizing projects into folders and assigning permissions to Google groups at the folder level allows for scalable and manageable access control. Using Google Cloud Directory Sync (GCDS) to synchronize users and groups from the on-premises directory service ensures that access controls are maintained and updated automatically as users change roles or leave the company.
Steps:
Organize Projects in Folders: Create a folder structure in the Google Cloud Resource Manager to organize projects by business unit.
Assign Permissions to Google Groups: Use IAM to assign necessary permissions to Google Groups at the folder level, ensuring each business unit can manage access controls for their own projects.
Synchronize Users and Groups: Use GCDS to sync users and group memberships from your on-premises directory service to Google Cloud Identity, ensuring that changes in the on-premises directory are reflected in Google Cloud.
Reference:
Google Cloud Resource Manager
Google Cloud Directory Sync

Cloud NAT (Network Address Translation) enables instances in a private network to connect to external services while not exposing their internal IP addresses to the public internet. This solution helps in situations where VMs need to initiate outbound connections without having a public IP address:
Cloud NAT Setup: Configure Cloud NAT for the subnet where your VMs are located. This allows these VMs to use the NAT gateway to communicate with external services securely.
Network Security: By using Cloud NAT, the internal IP addresses of VMs remain private, reducing the attack surface and enhancing security.
Operational Continuity: VMs can continue to communicate with external sites as needed for operations without requiring public IP addresses, meeting both security and functional requirements.
Reference:
Cloud NAT Documentation

If the environment variable GOOGLE_APPLICATION_CREDENTIALS is set, ADC uses the service account key or configuration file that the variable points to. If the environment variable GOOGLE_APPLICATION_CREDENTIALS isn't set, ADC uses the service account that is attached to the resource that is running your code. https://cloud.google.com/docs/authentication/production#passing_the_path_to_the_service_account_key_in_code