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The following table provides basic cluster infrastructure guidance for validated hardware configurations. A container cluster can be deployed quickly and reliably when each node is within the validated design guidelines. For detailed configuration information, see Cluster Hardware Design.
Type | Description | Count | Notes |
CSAH node | Dell PowerEdge R6625 server | 2 | Creates a bootstrap VM. CSAH runs a single instance of HAProxy for UPI-based deployment. For an enterprise HA deployment of OpenShift Container Platform 4.14, Dell Technologies recommends using a commercially supported L4 load-balancer or proxy service, or an additional PowerEdge R660 CSAH node running HAProxy and KeepAlived alongside the primary CSAH node. The options include commercial HAProxy, Nginx, and F5. Used as a DNS server, DHCP server, and administration host. |
Control-plane nodes | Dell PowerEdge R6625 or R7625 server | 3 | Deployed using the bootstrap VM. |
Compute nodes | Dell PowerEdge R6625 or R7625 server | A minimum of 2* and a maximum of 30 (R6625) or 15 (R7625) per rack | A standard deployment requires a minimum of two compute nodes. |
Single-node OpenShift | Dell PowerEdge R6625 or R7625 server | 1 | Edge-optimized server options for deploying SNO. |
Network switches | Either of the following switches:
| 2 per rack | Configured at installation time. Note:
|
OOB network | Dell PowerSwitch S3148 | 1 per rack | Used for iDRAC management. |
Rack | Selected according to site standards | 1 to 7 racks | For multirack configurations, consult your Dell Technologies or Red Hat representative regarding custom engineering design. |
*A three-node cluster does not require any compute nodes. To expand a three-node cluster with additional compute machines, first expand the cluster to a five-node cluster using two additional compute nodes.
Installing OpenShift Container Platform requires, at a minimum:
CSAH serves as an admin host and is required to access the cluster.
HA of the key services that make up the OpenShift Container Platform cluster is necessary to ensure run-time integrity. Redundancy of physical nodes for each cluster node type is an important aspect of HA for the bare-metal cluster. In this design guide, HA includes the provisioning of at least two NICs and two network switches that are configured to provide redundant pathing. The redundant pathing provides for network continuity if a NIC or a network switch fails.