Customer Cloud Subscriptions on AWS | Planning your environment

OpenShift Dedicated provides a Customer Cloud Subscription (CCS) model that allows Red Hat to deploy and manage clusters into a customer’s existing Amazon Web Service (AWS) account.

Understanding Customer Cloud Subscriptions on AWS

To deploy OpenShift Dedicated into your existing Amazon Web Services (AWS) account using the Customer Cloud Subscription (CCS) model, Red Hat requires several prerequisites be met.

Red Hat recommends the usage of an AWS Organization to manage multiple AWS accounts. The AWS Organization, managed by the customer, hosts multiple AWS accounts. There is a root account in the organization that all accounts will refer to in the account hierarchy.

It is recommended for the OpenShift Dedicated cluster using a CCS model to be hosted in an AWS account within an AWS Organizational Unit. A service control policy (SCP) is created and applied to the AWS Organizational Unit that manages what services the AWS sub-accounts are permitted to access. The SCP applies only to available permissions within a single AWS account for all AWS sub-accounts within the Organizational Unit. It is also possible to apply a SCP to a single AWS account. All other accounts in the customer’s AWS Organization are managed in whatever manner the customer requires. Red Hat Site Reliability Engineers (SRE) will not have any control over SCPs within the AWS Organization.

Customer requirements

OpenShift Dedicated clusters using a Customer Cloud Subscription (CCS) model on Amazon Web Services (AWS) must meet several prerequisites before they can be deployed.

Account

The customer ensures that AWS limits are sufficient to support OpenShift Dedicated provisioned within the customer-provided AWS account.

The customer-provided AWS account should be in the customer’s AWS Organization with the applicable service control policy (SCP) applied.

It is not a requirement that the customer-provided account be within an AWS Organization or for the SCP to be applied, however Red Hat must be able to perform all the actions listed in the SCP without restriction.

The customer-provided AWS account must not be transferable to Red Hat.
The customer may not impose AWS usage restrictions on Red Hat activities. Imposing restrictions severely hinders Red Hat’s ability to respond to incidents.
Red Hat deploys monitoring into AWS to alert Red Hat when a highly privileged account, such as a root account, logs into the customer-provided AWS account.
The customer can deploy native AWS services within the same customer-provided AWS account.

Customers are encouraged, but not mandated, to deploy resources in a Virtual Private Cloud (VPC) separate from the VPC hosting OpenShift Dedicated and other Red Hat supported services.

Access requirements

To appropriately manage the OpenShift Dedicated service, Red Hat must have the AdministratorAccess policy applied to the administrator role at all times.

This policy only provides Red Hat with permissions and capabilities to change resources in the customer-provided AWS account.
Red Hat must have AWS console access to the customer-provided AWS account. This access is protected and managed by Red Hat.
The customer must not utilize the AWS account to elevate their permissions within the OpenShift Dedicated cluster.
Actions available in OpenShift Cluster Manager must not be directly performed in the customer-provided AWS account.

Support requirements

Red Hat recommends that the customer have at least Business Support from AWS.
Red Hat has authority from the customer to request AWS support on their behalf.
Red Hat has authority from the customer to request AWS resource limit increases on the customer-provided account.
Red Hat manages the restrictions, limitations, expectations, and defaults for all OpenShift Dedicated clusters in the same manner, unless otherwise specified in this requirements section.

Security requirements

The customer-provided IAM credentials must be unique to the customer-provided AWS account and must not be stored anywhere in the customer-provided AWS account.
Volume snapshots will remain within the customer-provided AWS account and customer-specified region.
Red Hat must have ingress access to EC2 hosts and the API server through white-listed Red Hat machines.
Red Hat must have egress allowed to forward system and audit logs to a Red Hat managed central logging stack.

Required customer procedure

The Customer Cloud Subscription (CCS) model allows Red Hat to deploy and manage OpenShift Dedicated into a customer’s Amazon Web Services (AWS) account. Red Hat requires several prerequisites in order to provide these services.

Procedure

If the customer is using AWS Organizations, you must either use an AWS account within your organization or create a new one.
To ensure that Red Hat can perform necessary actions, you must either create a service control policy (SCP) or ensure that none is applied to the AWS account.
Attach the SCP to the AWS account.
Within the AWS account, you must create an osdCcsAdmin IAM user with the following requirements:
- This user needs at least Programmatic access enabled.
- This user must have the AdministratorAccess policy attached to it.
Provide the IAM user credentials to Red Hat.
- You must provide the access key ID and secret access key in OpenShift Cluster Manager.

Minimum required service control policy (SCP)

Service control policy (SCP) management is the responsibility of the customer. These policies are maintained in the AWS Organization and control what services are available within the attached AWS accounts.

Required/optional	Service	Actions	Effect
Required	Amazon EC2	All	Allow
Amazon EC2 Auto Scaling	All	Allow
Amazon S3	All	Allow
Identity And Access Management	All	Allow
Elastic Load Balancing	All	Allow
Elastic Load Balancing V2	All	Allow
Amazon CloudWatch	All	Allow
Amazon CloudWatch Events	All	Allow
Amazon CloudWatch Logs	All	Allow
AWS Support	All	Allow
AWS Key Management Service	All	Allow
AWS Security Token Service	All	Allow
AWS Resource Tagging	All	Allow
AWS Route53 DNS	All	Allow
AWS Service Quotas	ListServices GetRequestedServiceQuotaChange GetServiceQuota RequestServiceQuotaIncrease ListServiceQuotas	Allow
Optional	AWS Billing	ViewAccount Viewbilling ViewUsage	Allow
AWS Cost and Usage Report	All	Allow
AWS Cost Explorer Services	All	Allow

Required/optional

Service

Actions

Effect

Required

Amazon EC2

All

Allow

Amazon EC2 Auto Scaling

All

Allow

Amazon S3

All

Allow

Identity And Access Management

All

Allow

Elastic Load Balancing

All

Allow

Elastic Load Balancing V2

All

Allow

Amazon CloudWatch

All

Allow

Amazon CloudWatch Events

All

Allow

Amazon CloudWatch Logs

All

Allow

AWS Support

All

Allow

AWS Key Management Service

All

Allow

AWS Security Token Service

All

Allow

AWS Resource Tagging

All

Allow

AWS Route53 DNS

All

Allow

AWS Service Quotas

ListServices

GetRequestedServiceQuotaChange

GetServiceQuota

RequestServiceQuotaIncrease

ListServiceQuotas

Allow

Optional

AWS Billing

ViewAccount

Viewbilling

ViewUsage

Allow

AWS Cost and Usage Report

All

Allow

AWS Cost Explorer Services

All

Allow

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "ec2:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "autoscaling:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "s3:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "iam:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "elasticloadbalancing:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "cloudwatch:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "events:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "logs:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "support:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "kms:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "sts:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "tag:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "route53:*"
            ],
            "Resource": [
                "*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "servicequotas:ListServices",
                "servicequotas:GetRequestedServiceQuotaChange",
                "servicequotas:GetServiceQuota",
                "servicequotas:RequestServiceQuotaIncrease",
                "servicequotas:ListServiceQuotas"
            ],
            "Resource": [
                "*"
            ]
        }
    ]
}

Red Hat managed IAM references for AWS

Red Hat is responsible for creating and managing the following Amazon Web Services (AWS) resources: IAM policies, IAM users, and IAM roles.

IAM policies

IAM policies are subject to modification as the capabilities of OpenShift Dedicated change.

The AdministratorAccess policy is used by the administration role. This policy provides Red Hat the access necessary to administer the OpenShift Dedicated cluster in the customer-provided AWS account.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": "*",
            "Resource": "*",
            "Effect": "Allow"
        }
    ]
}

The CustomerAdministratorAccess role provides the customer access to administer a subset of services within the AWS account. At this time, the following are allowed:

VPC Peering
VPN Setup

Direct Connect (only available if granted through the service control policy)

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "ec2:AttachVpnGateway",
                "ec2:DescribeVpnConnections",
                "ec2:AcceptVpcPeeringConnection",
                "ec2:DeleteVpcPeeringConnection",
                "ec2:DescribeVpcPeeringConnections",
                "ec2:CreateVpnConnectionRoute",
                "ec2:RejectVpcPeeringConnection",
                "ec2:DetachVpnGateway",
                "ec2:DeleteVpnConnectionRoute",
                "ec2:DeleteVpnGateway",
                "ec2:DescribeVpcs",
                "ec2:CreateVpnGateway",
                "ec2:ModifyVpcPeeringConnectionOptions",
                "ec2:DeleteVpnConnection",
                "ec2:CreateVpcPeeringConnection",
                "ec2:DescribeVpnGateways",
                "ec2:CreateVpnConnection",
                "ec2:DescribeRouteTables",
                "ec2:CreateTags",
                "ec2:CreateRoute",
          "directconnect:*"
            ],
            "Resource": "*"
        }
    ]
}

If enabled, the BillingReadOnlyAccess role provides read-only access to view billing and usage information for the account.

Billing and usage access is only granted if the root account in the AWS Organization has it enabled. This is an optional step the customer must perform to enable read-only billing and usage access and does not impact the creation of this profile and the role that uses it. If this role is not enabled, users will not see billing and usage information. See this tutorial on how to enable access to billing data.
```
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "aws-portal:ViewAccount",
                "aws-portal:ViewBilling"
            ],
            "Resource": "*"
        }
    ]
}
```

IAM users

The osdManagedAdmin user is created immediately after taking control of the customer-provided AWS account. This is the user that will perform the OpenShift Dedicated cluster installation.

IAM roles

The network-mgmt role provides customer-federated administrative access to the AWS account through a separate AWS account. It also has the same access as a read-only role. The network-mgmt role only applies to non-Customer Cloud Subscription (CCS) clusters. The following policies are attached to the role:
- AmazonEC2ReadOnlyAccess
- CustomerAdministratorAccess
The read-only role provides customer-federated read-only access to the AWS account through a separate AWS account. The following policies are attached to the role:
- AWSAccountUsageReportAccess
- AmazonEC2ReadOnlyAccess
- AmazonS3ReadOnlyAccess
- IAMReadOnlyAccess
- BillingReadOnlyAccess

Provisioned AWS Infrastructure

This is an overview of the provisioned Amazon Web Services (AWS) components on a deployed OpenShift Dedicated cluster. For a more detailed listing of all provisioned AWS components, see the OpenShift Container Platform documentation.

AWS Elastic Computing (EC2) instances

AWS EC2 instances are required to deploy the control plane and data plane functions of OpenShift Dedicated in the AWS public cloud. Instance types might vary for control plane and infrastructure nodes depending on worker node count.

Single availability zone
- 3 m5.2xlarge minimum (control plane nodes)
- 2 r5.xlarge minimum (infrastructure nodes)
- 2 m5.xlarge minimum but highly variable (worker nodes)
Multiple availability zones
- 3 m5.2xlarge minimum (control plane nodes)
- 3 r5.xlarge minimum (infrastructure nodes)
- 3 m5.xlarge minimum but highly variable (worker nodes)

AWS Elastic Block Store (EBS) storage

Amazon EBS block storage is used for both local node storage and persistent volume storage.

Volume requirements for each EC2 instance:

Control plane volumes
- Size: 350 GB
- Type: io1
- Input/output operations per second: 1000
Infrastructure volumes
- Size: 300 GB
- Type: gp2
- Input/output operations per second: 900
Worker volumes
- Size: 300 GB
- Type: gp2
- Input/output operations per second: 900

Elastic Load Balancing (ELB) load balancers

Up to two Network Load Balancers for API and up to two Classic Load Balancers for application router. For more information, see the ELB documentation for AWS.

S3 storage

The image registry and Elastic Block Store (EBS) volume snapshots are backed by AWS S3 storage. Pruning of resources is performed regularly to optimize S3 usage and cluster performance.

Two buckets are required with a typical size of 2 TB each.

VPC

Customers should expect to see one VPC per cluster. Additionally, the VPC needs the following configurations:

Subnets: Two subnets for a cluster with a single availability zone, or six subnets for a cluster with multiple availability zones.

A public subnet connects directly to the internet through an internet gateway. A private subnet connects to the internet through a network address translation (NAT) gateway.
Route tables: One route table per private subnet, and one additional table per cluster.
Internet gateways: One Internet Gateway per cluster.
NAT gateways: One NAT Gateway per public subnet.

Sample VPC Architecture

Security groups

AWS security groups provide security at the protocol and port-access level; they are associated with EC2 instances and Elastic Load Balancing. Each security group contains a set of rules that filter traffic coming in and out of an EC2 instance. You must ensure the ports required for the OpenShift Container Platform installation are open on your network and configured to allow access between hosts.

Additional custom security groups

When you create a cluster by using a non-managed VPC, you can add custom security groups during cluster creation. Custom security groups are subject to the following limitations:

You must create the custom security groups in AWS before you create the cluster. For more information, see Amazon EC2 security groups for Linux instances.
You must associate the custom security groups with the VPC that the cluster will be installed into. Your custom security groups cannot be associated with another VPC.
You might need to request additional quota for your VPC if you are adding additional custom security groups. For information on requesting an AWS quota increase, see Requesting a quota increase.

AWS firewall prerequisites

This section provides the necessary details that enable you to control egress traffic from your OpenShift Dedicated cluster. If you are using a firewall to control egress traffic, you must configure your firewall to grant access to the domain and port combinations below. OpenShift Dedicated requires this access to provide a fully managed OpenShift service.

Procedure

Allowlist the following URLs that are used to install and download packages and tools:

Domain Port Function

Domain	Port	Function
`registry.redhat.io`	443	Provides core container images.
`quay.io`	443	Provides core container images.
`.quay.io`	443	Provides core container images.
`sso.redhat.com`	443	Required. The `https://console.redhat.com/openshift` site uses authentication from `sso.redhat.com` to download the pull secret and use Red Hat SaaS solutions to facilitate monitoring of your subscriptions, cluster inventory, chargeback reporting, and so on.
`quay-registry.s3.amazonaws.com`	443	Provides core container images.
`ocm-quay-production-s3.s3.amazonaws.com`	443	Provides core container images.
`quayio-production-s3.s3.amazonaws.com`	443	Provides core container images.
`cart-rhcos-ci.s3.amazonaws.com`	443	Provides Red Hat Enterprise Linux CoreOS (RHCOS) images.
`openshift.org`	443	Provides Red Hat Enterprise Linux CoreOS (RHCOS) images.
`registry.access.redhat.com` ^[1]	443	Hosts all the container images that are stored on the Red Hat Ecosytem Catalog. Additionally, the registry provides access to the `odo` CLI tool that helps developers build on OpenShift and Kubernetes.
`registry.connect.redhat.com`	443	Required for all third-party images and certified Operators.
`console.redhat.com`	443	Required. Allows interactions between the cluster and OpenShift Console Manager to enable functionality, such as scheduling upgrades.
`sso.redhat.com`	443	The `https://console.redhat.com/openshift` site uses authentication from `sso.redhat.com`.
`pull.q1w2.quay.rhcloud.com`	443	Provides core container images as a fallback when quay.io is not available.
`.q1w2.quay.rhcloud.com`	443	Provides core container images as a fallback when quay.io is not available.
`www.okd.io`	443	The `openshift.org` site redirects through `www.okd.io`.
`www.redhat.com`	443	The `sso.redhat.com` site redirects through `www.redhat.com`.
`aws.amazon.com`	443	The `iam.amazonaws.com` and `sts.amazonaws.com` sites redirect through `aws.amazon.com`.
`catalog.redhat.com`	443	The `registry.access.redhat.com` and `https://registry.redhat.io` sites redirect through `catalog.redhat.com`.
`dvbwgdztaeq9o.cloudfront.net` ^[2]	443	Used by ROSA for STS implementation with managed OIDC configuration.

registry.redhat.io

443