Chapter 1. Preparing to deploy OpenShift Data Foundation
When you deploy OpenShift Data Foundation on OpenShift Container Platform using the local storage devices, you can create internal cluster resources. This approach internally provisions base services so that all the applications can access additional storage classes.
Before you begin the deployment of Red Hat OpenShift Data Foundation using a local storage, ensure that you meet the resource requirements. See Requirements for installing OpenShift Data Foundation using local storage devices.
Optional: If you want to enable cluster-wide encryption using an external Key Management System (KMS) follow these steps:
- Ensure that you have a valid Red Hat OpenShift Data Foundation Advanced subscription. To know how subscriptions for OpenShift Data Foundation work, see knowledgebase article on OpenShift Data Foundation subscriptions.
- When the Token authentication method is selected for encryption, refer to Enabling cluster-wide encryption with the Token authentication using KMS.
- When the Kubernetes authentication method is selected for encryption then refer to Enabling cluster-wide encryption with KMS using the Kubernetes authentication method.
- Ensure that you are using signed certificates on your vault servers.
After you have addressed the above, perform the following steps:
1.1. Requirements for installing OpenShift Data Foundation using local storage devices
Node requirements
The cluster must consist of at least three OpenShift Container Platform worker nodes with locally attached-storage devices on each of them.
- Each of the three selected nodes must have at least one raw block device available. OpenShift Data Foundation uses the one or more available raw block devices.
- The devices you use must be empty, the disks must not include Physical Volumes (PVs), Volume Groups (VGs), or Logical Volumes (LVs) remaining on the disk.
For more information, see the Resource requirements section in the Planning guide.
Disaster recovery requirements [Technology Preview]
Disaster Recovery features supported by Red Hat OpenShift Data Foundation require all of the following prerequisites to successfully implement a disaster recovery solution:
- A valid Red Hat OpenShift Data Foundation Advanced subscription.
- A valid Red Hat Advanced Cluster Management (RHACM) for Kubernetes subscription.
To know in detail how subscriptions for OpenShift Data Foundation work, see knowledgebase article on OpenShift Data Foundation subscriptions.
For detailed disaster recovery solution requirements, see Configuring OpenShift Data Foundation Disaster Recovery for OpenShift Workloads guide, and Requirements and recommendations section of the Install guide in Red Hat Advanced Cluster Management for Kubernetes documentation.
Arbiter stretch cluster requirements [Technology Preview]
In this case, a single cluster is stretched across two zones with a third zone as the location for the arbiter. This is a Technology Preview feature that is currently intended for deployment in the OpenShift Container Platform on-premises and in the same data center. This solution is not recommended for deployments stretching over multiple data centers. Instead, consider Metro-DR as a first option for no data loss DR solution deployed over multiple data centers with low latency networks.
For detailed requirements and instructions, see the Knowledgebase article on Configuring OpenShift Data Foundation for stretch cluster.
To know in detail how subscriptions for OpenShift Data Foundation work, see knowledgebase article on OpenShift Data Foundation subscriptions.
You cannot enable Flexible scaling and Arbiter both at the same time as they have conflicting scaling logic. With Flexible scaling, you can add one node at a time to your OpenShift Data Foundation cluster. Whereas, in an Arbiter cluster, you need to add at least one node in each of the two data zones.
Compact mode requirements
You can install OpenShift Data Foundation on a three-node OpenShift compact bare-metal cluster, where all the workloads run on three strong master nodes. There are no worker or storage nodes.
To configure OpenShift Container Platform in compact mode, see the Configuring a three-node cluster section of the Installing guide in OpenShift Container Platform documentation, and Delivering a Three-node Architecture for Edge Deployments.
Minimum starting node requirements
An OpenShift Data Foundation cluster is deployed with a minimum configuration when the resource requirement for a standard deployment is not met.
For more information, see the Resource requirements section in the Planning guide.
