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Chapter 2. Preparing to install a cluster that uses SR-IOV or OVS-DPDK on OpenStack
Before you install a OpenShift Container Platform cluster that uses single-root I/O virtualization (SR-IOV) or Open vSwitch with the Data Plane Development Kit (OVS-DPDK) on Red Hat OpenStack Platform (RHOSP), you must understand the requirements for each technology and then perform preparatory tasks.
2.1. Requirements for clusters on RHOSP that use either SR-IOV or OVS-DPDK
If you use SR-IOV or OVS-DPDK with your deployment, you must meet the following requirements:
- RHOSP compute nodes must use a flavor that supports huge pages.
2.1.1. Requirements for clusters on RHOSP that use SR-IOV
To use single-root I/O virtualization (SR-IOV) with your deployment, you must meet the following requirements:
- Plan your Red Hat OpenStack Platform (RHOSP) SR-IOV deployment.
- OpenShift Container Platform must support the NICs that you use. For a list of supported NICs, see "About Single Root I/O Virtualization (SR-IOV) hardware networks" in the "Hardware networks" subsection of the "Networking" documentation.
For each node that will have an attached SR-IOV NIC, your RHOSP cluster must have:
- One instance from the RHOSP quota
- One port attached to the machines subnet
- One port for each SR-IOV Virtual Function
- A flavor with at least 16 GB memory, 4 vCPUs, and 25 GB storage space
SR-IOV deployments often employ performance optimizations, such as dedicated or isolated CPUs. For maximum performance, configure your underlying RHOSP deployment to use these optimizations, and then run OpenShift Container Platform compute machines on the optimized infrastructure.
- For more information about configuring performant RHOSP compute nodes, see Configuring Compute nodes for performance.
2.1.2. Requirements for clusters on RHOSP that use OVS-DPDK
To use Open vSwitch with the Data Plane Development Kit (OVS-DPDK) with your deployment, you must meet the following requirements:
- Plan your Red Hat OpenStack Platform (RHOSP) OVS-DPDK deployment by referring to Planning your OVS-DPDK deployment in the Network Functions Virtualization Planning and Configuration Guide.
- Configure your RHOSP OVS-DPDK deployment according to Configuring an OVS-DPDK deployment in the Network Functions Virtualization Planning and Configuration Guide.
2.2. Preparing to install a cluster that uses SR-IOV
You must configure RHOSP before you install a cluster that uses SR-IOV on it.
When installing a cluster using SR-IOV, you must deploy clusters using cgroup v1. For more information, Enabling Linux control group version 1 (cgroup v1).
cgroup v1 is a deprecated feature. Deprecated functionality is still included in OpenShift Container Platform and continues to be supported; however, it will be removed in a future release of this product and is not recommended for new deployments.
For the most recent list of major functionality that has been deprecated or removed within OpenShift Container Platform, refer to the Deprecated and removed features section of the OpenShift Container Platform release notes.
2.2.1. Creating SR-IOV networks for compute machines
If your Red Hat OpenStack Platform (RHOSP) deployment supports single root I/O virtualization (SR-IOV), you can provision SR-IOV networks that compute machines run on.
The following instructions entail creating an external flat network and an external, VLAN-based network that can be attached to a compute machine. Depending on your RHOSP deployment, other network types might be required.
Prerequisites
Your cluster supports SR-IOV.
NoteIf you are unsure about what your cluster supports, review the OpenShift Container Platform SR-IOV hardware networks documentation.
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You created radio and uplink provider networks as part of your RHOSP deployment. The names
radioanduplinkare used in all example commands to represent these networks.
Procedure
On a command line, create a radio RHOSP network:
$ openstack network create radio --provider-physical-network radio --provider-network-type flat --external
Create an uplink RHOSP network:
$ openstack network create uplink --provider-physical-network uplink --provider-network-type vlan --external
Create a subnet for the radio network:
$ openstack subnet create --network radio --subnet-range <radio_network_subnet_range> radio
Create a subnet for the uplink network:
$ openstack subnet create --network uplink --subnet-range <uplink_network_subnet_range> uplink
2.3. Preparing to install a cluster that uses OVS-DPDK
You must configure RHOSP before you install a cluster that uses SR-IOV on it.
- Complete Creating a flavor and deploying an instance for OVS-DPDK before you install a cluster on RHOSP.
After you perform preinstallation tasks, install your cluster by following the most relevant OpenShift Container Platform on RHOSP installation instructions. Then, perform the tasks under "Next steps" on this page.
2.4. Next steps
For either type of deployment:
To complete SR-IOV configuration after you deploy your cluster:
Consult the following references after you deploy your cluster to improve its performance:
