Configuring a GCP project - Installing on GCP | Installing

Creating a GCP project
Enabling API services in GCP
Configuring DNS for GCP
GCP account limits
Creating a service account in GCP
- Required GCP permissions
Supported GCP regions
Next steps

Before you can install OKD, you must configure a Google Cloud Platform (GCP) project to host it.

Creating a GCP project

To install OKD, you must create a project in your Google Cloud Platform (GCP) account to host the cluster.

Procedure

Create a project to host your OKD cluster. See Creating and Managing Projects in the GCP documentation.

Your GCP project must use the Premium Network Service Tier if you are using installer-provisioned infrastructure. The Standard Network Service Tier is not supported for clusters installed using the installation program. The installation program configures internal load balancing for the api-int.<cluster_name>.<base_domain> URL; the Premium Tier is required for internal load balancing.

Enabling API services in GCP

Your Google Cloud Platform (GCP) project requires access to several API services to complete OKD installation.

Prerequisites

You created a project to host your cluster.

Procedure

Enable the following required API services in the project that hosts your cluster. See Enabling services in the GCP documentation.

Table 1. Required API services
API service	Console service name
Compute Engine API	`compute.googleapis.com`
Google Cloud APIs	`cloudapis.googleapis.com`
Cloud Resource Manager API	`cloudresourcemanager.googleapis.com`
Google DNS API	`dns.googleapis.com`
IAM Service Account Credentials API	`iamcredentials.googleapis.com`
Identity and Access Management (IAM) API	`iam.googleapis.com`
Service Management API	`servicemanagement.googleapis.com`
Service Usage API	`serviceusage.googleapis.com`
Google Cloud Storage JSON API	`storage-api.googleapis.com`
Cloud Storage	`storage-component.googleapis.com`

Configuring DNS for GCP

To install OKD, the Google Cloud Platform (GCP) account you use must have a dedicated public hosted zone in the same project that you host the OKD cluster. This zone must be authoritative for the domain. The DNS service provides cluster DNS resolution and name lookup for external connections to the cluster.

Procedure

Identify your domain, or subdomain, and registrar. You can transfer an existing domain and registrar or obtain a new one through GCP or another source.

If you purchase a new domain, it can take time for the relevant DNS changes to propagate. For more information about purchasing domains through Google, see Google Domains.
Create a public hosted zone for your domain or subdomain in your GCP project. See Creating public zones in the GCP documentation.

Use an appropriate root domain, such as openshiftcorp.com, or subdomain, such as clusters.openshiftcorp.com.
Extract the new authoritative name servers from the hosted zone records. See Look up your Cloud DNS name servers in the GCP documentation.

You typically have four name servers.
Update the registrar records for the name servers that your domain uses. For example, if you registered your domain to Google Domains, see the following topic in the Google Domains Help: How to switch to custom name servers.
If you migrated your root domain to Google Cloud DNS, migrate your DNS records. See Migrating to Cloud DNS in the GCP documentation.
If you use a subdomain, follow your company’s procedures to add its delegation records to the parent domain. This process might include a request to your company’s IT department or the division that controls the root domain and DNS services for your company.

GCP account limits

The OKD cluster uses a number of Google Cloud Platform (GCP) components, but the default Quotas do not affect your ability to install a default OKD cluster.

A default cluster, which contains three compute and three control plane machines, uses the following resources. Note that some resources are required only during the bootstrap process and are removed after the cluster deploys.

Table 2. GCP resources used in a default cluster
Service	Component	Location	Total resources required	Resources removed after bootstrap
Service account	IAM	Global	5	0
Firewall rules	Compute	Global	11	1
Forwarding rules	Compute	Global	2	0
In-use global IP addresses	Compute	Global	4	1
Health checks	Compute	Global	3	0
Images	Compute	Global	1	0
Networks	Compute	Global	2	0
Static IP addresses	Compute	Region	4	1
Routers	Compute	Global	1	0
routes	Compute	Global	2	0
Subnetworks	Compute	Global	2	0
Target pools	Compute	Global	3	0
CPUs	Compute	Region	28	4
Persistent disk SSD (GB)	Compute	Region	896	128

If any of the quotas are insufficient during installation, the installation program displays an error that states both which quota was exceeded and the region.

Be sure to consider your actual cluster size, planned cluster growth, and any usage from other clusters that are associated with your account. The CPU, static IP addresses, and persistent disk SSD (storage) quotas are the ones that are most likely to be insufficient.

If you plan to deploy your cluster in one of the following regions, you will exceed the maximum storage quota and are likely to exceed the CPU quota limit:

asia-east2
asia-northeast2
asia-south1
australia-southeast1
europe-north1
europe-west2
europe-west3
europe-west6
northamerica-northeast1
southamerica-east1
us-west2

You can increase resource quotas from the GCP console, but you might need to file a support ticket. Be sure to plan your cluster size early so that you can allow time to resolve the support ticket before you install your OKD cluster.

Creating a service account in GCP

OKD requires a Google Cloud Platform (GCP) service account that provides authentication and authorization to access data in the Google APIs. If you do not have an existing IAM service account that contains the required roles in your project, you must create one.

Prerequisites

You created a project to host your cluster.

Procedure

Create a service account in the project that you use to host your OKD cluster. See Creating a service account in the GCP documentation.

Grant the service account the appropriate permissions. You can either grant the individual permissions that follow or assign the Owner role to it. See Granting roles to a service account for specific resources.

While making the service account an owner of the project is the easiest way to gain the required permissions, it means that service account has complete control over the project. You must determine if the risk that comes from offering that power is acceptable.

Create the service account key in JSON format. See Creating service account keys in the GCP documentation.

The service account key is required to create a cluster.

Required GCP permissions

When you attach the Owner role to the service account that you create, you grant that service account all permissions, including those that are required to install OKD. To deploy an OKD cluster, the service account requires the following permissions. If you deploy your cluster into an existing VPC, the service account does not require certain networking permissions, which are noted in the following lists:

Required roles for the installation program

Compute Admin
Security Admin
Service Account Admin
Service Account User
Storage Admin

Required roles for creating network resources during installation

DNS Administrator

Optional roles

For the cluster to create new limited credentials for its Operators, add the following role:

Service Account Key Admin

The roles are applied to the service accounts that the control plane and compute machines use:

Table 3. GCP service account permissions
Account	Roles
Control Plane	`roles/compute.instanceAdmin`
	`roles/compute.networkAdmin`
	`roles/compute.securityAdmin`
	`roles/storage.admin`
	`roles/iam.serviceAccountUser`
Compute	`roles/compute.viewer`
Compute	`roles/storage.admin`

Supported GCP regions

You can deploy an OKD cluster to the following Google Cloud Platform (GCP) regions:

asia-east1 (Changhua County, Taiwan)
asia-east2 (Hong Kong)
asia-northeast1 (Tokyo, Japan)
asia-northeast2 (Osaka, Japan)
asia-northeast3 (Seoul, South Korea)
asia-south1 (Mumbai, India)
asia-southeast1 (Jurong West, Singapore)
asia-southeast2 (Jakarta, Indonesia)
australia-southeast1 (Sydney, Australia)
europe-north1 (Hamina, Finland)
europe-west1 (St. Ghislain, Belgium)
europe-west2 (London, England, UK)
europe-west3 (Frankfurt, Germany)
europe-west4 (Eemshaven, Netherlands)
europe-west6 (Zürich, Switzerland)
northamerica-northeast1 (Montréal, Québec, Canada)
southamerica-east1 (São Paulo, Brazil)
us-central1 (Council Bluffs, Iowa, USA)
us-east1 (Moncks Corner, South Carolina, USA)
us-east4 (Ashburn, Northern Virginia, USA)
us-west1 (The Dalles, Oregon, USA)
us-west2 (Los Angeles, California, USA)
us-west3 (Salt Lake City, Utah, USA)
us-west4 (Las Vegas, Nevada, USA)

Next steps

Install an OKD cluster on GCP. You can install a customized cluster or quickly install a cluster with default options.