Chapter 3. Infrastructure and system requirements You must plan your Red Hat OpenStack Services on OpenShift (RHOSO) deployment to determine the infrastructure and system requirements for your environment. 3.1. Red Hat OpenShift Container Platform cluster requirements There are minimum hardware, network, and software requirements for the Red Hat OpenShift Container Platform (RHOCP) cluster that hosts your Red Hat OpenStack Services on OpenShift (RHOSO) control plane. 3.1.1. RHOCP hardware requirements The minimum hardware requirements for the Red Hat OpenShift Container Platform (RHOCP) cluster that hosts your Red Hat OpenStack Services on OpenShift (RHOSO) control plane are as follows: An operational, pre-provisioned 3-node RHOCP compact cluster, version 4.16. Each node in the compact cluster must have the following resources: 64 GB RAM 16 CPU cores 120GB NVMe or SSD for the root disk plus 250 GB storage (NVMe or SSD is strongly recommended) Note The images, volumes and root disks for the virtual machine instances running on the deployed environment are hosted on dedicated external storage nodes. However, the service logs, databases, and metadata are stored in a RHOCP Persistent Volume Claim (PVC). A minimum of 150 GB is required for testing. 2 physical NICs Note In a 6-node cluster with 3 controllers and 3 workers, only the worker nodes require 2 physical NICs. Persistent Volume Claim (PVC) storage on the cluster: 150 GB persistent volume (PV) pool for service logs, databases, file import conversion, and metadata. Note You must plan the size of the PV pool that you require for your RHOSO pods based on your RHOSO workload. For example, the Image service image conversion PVC should be large enough to host the largest image and that image after it is converted, as well as any other concurrent conversions. You must make similar considerations for the storage requirements if your RHOSO deployment uses the Object Storage service (swift). The PV pool is required for the Image service, however the actual images are stored on the Image service back end, such as Red Hat Ceph Storage or SAN. 5 GB of the available PVs must be backed by local SSDs for control plane services such as the Galera, OVN, and RabbitMQ databases. 3.1.2. RHOCP network requirements The minimum network requirements for the Red Hat OpenShift Container Platform (RHOCP) cluster that hosts your Red Hat OpenStack Services on OpenShift (RHOSO) control plane are as follows: If you are using virtual media boot to provision bare-metal data plane nodes and the nodes are not connected to a provisioning network or to the RHOCP machine network, you must configure a route for the Baseboard Management Controller (BMC) and the node to reach the RHOCP machine network. The machine network is the network used by RHOCP cluster nodes to communicate with each other. The following ports must be open between cluster nodes: Port Description 67 , 68 When using a provisioning network, cluster nodes access the dnsmasq DHCP server over their provisioning network interfaces using ports 67 and 68 . 69 When using a provisioning network, cluster nodes communicate with the TFTP server on port 69 using their provisioning network interfaces. The TFTP server runs on the bootstrap VM. The bootstrap VM runs on the provisioner node. 80 When not using the image caching option or when using virtual media, the provisioner node must have port 80 open on the baremetal machine network interface to stream the Red Hat Enterprise Linux CoreOS (RHCOS) image from the provisioner node to the cluster nodes. 123 The cluster nodes must access the NTP server on port 123 using the baremetal machine network. 5050 The Ironic Inspector API runs on the control plane nodes and listens on port 5050 . The Inspector API is responsible for hardware introspection, which collects information about the hardware characteristics of the bare-metal nodes. 5051 Port 5050 uses port 5051 as a proxy. 6180 When deploying with virtual media and not using TLS, the provisioner node and the control plane nodes must have port 6180 open on the baremetal machine network interface so that the baseboard management controller (BMC) of the worker nodes can access the RHCOS image. Starting with OpenShift Container Platform 4.13, the default HTTP port is 6180 . 6183 When deploying with virtual media and using TLS, the provisioner node and the control plane nodes must have port 6183 open on the baremetal machine network interface so that the BMC of the worker nodes can access the RHCOS image. 6190 - 6220 The OpenStackProvisionServer custom resource (CR) is required to install RHEL. If there is a firewall between your RHOCP machine network and the RHOSO control plane, you must open ports 6190 - 6220 . The OpenStackProvisionServer CR is automatically created by default during the installation and deployment of your Red Hat OpenStack on OpenShift (RHOSO) environment and it uses the port range 6190 - 6220 . You can create a custom OpenStackProvisionServer CR to limit the ports that are opened. 6385 The Ironic API server runs initially on the bootstrap VM and later on the control plane nodes and listens on port 6385 . The Ironic API allows clients to interact with Ironic for bare-metal node provisioning and management, including operations such as enrolling new nodes, managing their power state, deploying images, and cleaning the hardware. 6388 Port 6385 uses port 6388 as a proxy. 8080 When using image caching without TLS, port 8080 must be open on the provisioner node and accessible by the BMC interfaces of the cluster nodes. 8083 When using the image caching option with TLS, port 8083 must be open on the provisioner node and accessible by the BMC interfaces of the cluster nodes. 9999 By default, the Ironic Python Agent (IPA) listens on TCP port 9999 for API calls from the Ironic conductor service. Communication between the bare-metal node where IPA is running and the Ironic conductor service uses this port. 3.1.3. RHOCP software requirements The minimum software requirements for the Red Hat OpenShift Container Platform (RHOCP) cluster that hosts your Red Hat OpenStack Services on OpenShift (RHOSO) control plane are as follows: The RHOCP environment supports Multus CNI. The following Operators are installed on the RHOCP cluster: The Kubernetes NMState Operator. This Operator must be started by creating an nmstate instance. For information, see Installing the Kubernetes NMState Operator in the RHOCP Networking guide. The MetalLB Operator. This Operator must be started by creating a metallb instance. For information, see Starting MetalLB on your cluster in the RHOCP Networking guide. Note When you start MetalLB with the MetalLB Operator, the Operator starts an instance of a speaker pod on each node in the cluster. When using an extended architecture such as 3 RHOCP masters and 3 RHOCP workers, if your RHOCP masters do not have access to the ctlplane and internalapi networks, you must limit the speaker pods to the RHOCP worker nodes. For more information about speaker pods, see Limit speaker pods to specific nodes . The cert-manager Operator. For information, see cert-manager Operator for Red Hat OpenShift in the RHOCP Security and compliance guide. The Cluster Observability Operator. For information, see Installing the Cluster Observability Operator . The Cluster Baremetal Operator (CBO) is configured for provisioning. The CBO deploys the Bare Metal Operator (BMO) component, which is required to provision bare-metal nodes as part of the data plane deployment process. For more information on planning for bare-metal provisioning, see Planning provisioning for bare-metal data plane nodes . The following tools are installed on the cluster workstation: The oc command line tool. The podman command line tool. The RHOCP storage back end is configured. The RHOCP storage class is defined, and has access to persistent volumes of type ReadWriteOnce . Additional resources Configuring the install-config.yaml file Network configuration parameters Storage Post-installation storage configuration Installing the MetalLB Operator Kubernetes NMState 3.2. Data plane node requirements You can use pre-provisioned nodes or unprovisioned bare-metal nodes to create the data plane. The minimum requirements for data plane nodes are as follows: Pre-provisioned nodes: RHEL 9.4. Configured for SSH access with the SSH keys generated during data plane creation. The SSH user must either be root or have unrestricted and password-less sudo enabled. For more information, see Creating the data plane secrets in the Deploying Red Hat OpenStack Services on OpenShift guide. Routable IP address on the control plane network to enable Ansible access through SSH. Important Some network architectures may require the following networking capabilities: A dedicated NIC on RHOCP worker nodes for RHOSP isolated networks. Port switches with VLANs for the required isolated networks. Consult with your RHOCP and network administrators about whether these are requirements in your deployment. For information on the required isolated networks, see Default Red Hat OpenStack Platform networks in the Deploying Red Hat OpenStack Services on OpenShift guide. 3.3. Compute node requirements Compute nodes are responsible for running virtual machine instances after they are launched. Compute nodes require bare metal systems that support hardware virtualization. Compute nodes must also have enough memory and disk space to support the requirements of the virtual machine instances that they host. Note Red Hat OpenStack Services on OpenShift (RHOSO) 18.0 does not support using QEMU architecture emulation. Processor 64-bit x86 processor with support for the Intel 64 or AMD64 CPU extensions, and the AMD-V or Intel VT hardware virtualization extensions enabled. It is recommended that this processor has a minimum of 4 cores. Memory A minimum of 6 GB of RAM for the host operating system, plus additional memory to accommodate for the following considerations: Add additional memory that you intend to make available to virtual machine instances. Add additional memory to run special features or additional resources on the host, such as additional kernel modules, virtual switches, monitoring solutions, and other additional background tasks. If you intend to use non-uniform memory access (NUMA), you should designate 8GB per CPU socket node or 16 GB per socket node if you have more than 256 GB of physical RAM. Configure at least 4 GB of swap space. For more information about planning for Compute node memory configuration, see Configuring the Compute service for instance creation . Disk space A minimum of 50 GB of available disk space. Network Interface Cards A minimum of one 1 Gbps Network Interface Cards, although it is recommended to use at least two NICs in a production environment. Use additional network interface cards for bonded interfaces or to delegate tagged VLAN traffic. Platform management Compute nodes that are installer-provisioned require a supported platform management interface, such as an Intelligent Platform Management Interface (IPMI) functionality, on the server motherboard. This interface is not required for pre-provisioned nodes.

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