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2장. Preparing to install a cluster that uses SR-IOV or OVS-DPDK on OpenStack

Before installing an 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), review the requirements for each technology and complete all the preparatory tasks.

2.1. Requirements for clusters on RHOSP that use either SR-IOV or OVS-DPDK
링크 복사

If you use SR-IOV or OVS-DPDK with your deployment, you must meet certain requirements.

Ensure that RHOSP compute nodes use a flavor that supports huge pages.

2.1.1. Requirements for clusters on RHOSP that use SR-IOV
링크 복사

To use single-root I/O virtualization (SR-IOV) with your deployment, you must meet specific requirements.

The requirements are as follows:

  • You can plan your Red Hat OpenStack Platform (RHOSP) SR-IOV deployment. See "Planning an SR-IOV deployment (Red Hat OpenStack Platform (RHOSP) documentation)".
  • 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".

  • 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.

    • You can configure performant RHOSP compute nodes. See "Configuring the Compute Service for Instance Creation".

2.1.2. Requirements for clusters on RHOSP that use OVS-DPDK
링크 복사

To use Open vSwitch with the Data Plane Development Kit (OVS-DPDK) with your deployment, you must meet specific requirements.

The requirements are as follows:

  • Plan your OVS-DPDK deployment. For more information, see "Planning your OVS-DPDK deployment (Red Hat OpenStack Platform (RHOSP) documentation)".
  • Configure your OVS-DPDK deployment. For more information, see "Configuring an OVS-DPDK deployment (Red Hat OpenStack Platform (RHOSP) documentation)".

2.1.3. Creating SR-IOV networks for compute machines
링크 복사

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.

You must configure your RHOSP platform before you install a cluster that uses SR-IOV on the platform.

참고

The procedure uses an example of 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.

    참고

    If you are unsure about what your cluster supports, review the OpenShift Container Platform SR-IOV hardware networks documentation.

  • You created radio and uplink provider networks as part of your RHOSP deployment. The names radio and uplink are used in all example commands to represent these networks.

Procedure

  1. On a command line, create a radio RHOSP network: 

    $ openstack network create radio --provider-physical-network radio --provider-network-type flat --external

  2. Create an uplink RHOSP network: 

    $ openstack network create uplink --provider-physical-network uplink --provider-network-type vlan --external

  3. Create a subnet for the radio network: 

    $ openstack subnet create --network radio --subnet-range <radio_network_subnet_range> radio

  4. Create a subnet for the uplink network: 

    $ openstack subnet create --network uplink --subnet-range <uplink_network_subnet_range> uplink
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