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11.2. Configuring vGPU on the Compute nodes

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To enable your cloud users to create instances that use a virtual GPU (vGPU), you must configure the Compute nodes that have the physical GPUs:

  1. Build a custom GPU-enabled overcloud image.
  2. Prepare the GPU role, profile, and flavor for designating Compute nodes for vGPU.
  3. Configure the Compute node for vGPU.
  4. Deploy the overcloud.
注記

To use an NVIDIA GRID vGPU, you must comply with the NVIDIA GRID licensing requirements and you must have the URL of your self-hosted license server. For more information, see the NVIDIA License Server Release Notes web page.

11.2.1. Building a custom GPU overcloud image

Perform the following steps on the director node to install the NVIDIA GRID host driver on an overcloud Compute image and upload the image to the OpenStack Image service (glance).

Procedure

  1. Copy the overcloud image and add the gpu suffix to the copied image.

    $ cp overcloud-full.qcow2 overcloud-full-gpu.qcow2
  2. Install an ISO image generator tool from YUM.

    $ sudo yum install genisoimage -y
  3. Download the NVIDIA GRID host driver RPM package that corresponds to your GPU device from the NVIDIA website. To determine which driver you need, see the NVIDIA Driver Downloads Portal.

    注記

    You must be a registered NVIDIA customer to download the drivers from the portal.

  4. Create an ISO image from the driver RPM package and save the image in the nvidia-host directory.

    $ genisoimage -o nvidia-host.iso -R -J -V NVIDIA nvidia-host/
    I: -input-charset not specified, using utf-8 (detected in locale settings)
      9.06% done, estimate finish Wed Oct 31 11:24:46 2018
     18.08% done, estimate finish Wed Oct 31 11:24:46 2018
     27.14% done, estimate finish Wed Oct 31 11:24:46 2018
     36.17% done, estimate finish Wed Oct 31 11:24:46 2018
     45.22% done, estimate finish Wed Oct 31 11:24:46 2018
     54.25% done, estimate finish Wed Oct 31 11:24:46 2018
     63.31% done, estimate finish Wed Oct 31 11:24:46 2018
     72.34% done, estimate finish Wed Oct 31 11:24:46 2018
     81.39% done, estimate finish Wed Oct 31 11:24:46 2018
     90.42% done, estimate finish Wed Oct 31 11:24:46 2018
     99.48% done, estimate finish Wed Oct 31 11:24:46 2018
    Total translation table size: 0
    Total rockridge attributes bytes: 358
    Total directory bytes: 0
    Path table size(bytes): 10
    Max brk space used 0
    55297 extents written (108 MB)
  5. Create a driver installation script that also disables the nouveau driver and generates a new initramfs. The following example script, install_nvidia.sh, disables the nouveau driver, generates a new initramfs, and installs the NVIDIA GRID host driver on the overcloud image:

    #/bin/bash
    
    cat <<EOF >/etc/modprobe.d/disable-nouveau.conf
    blacklist nouveau
    options nouveau modeset=0
    EOF
    echo 'omit_drivers+=" nouveau "' > /etc/dracut.conf.d/disable-nouveau.conf
    dracut -f
    
    # NVIDIA GRID package
    mkdir /tmp/mount
    mount LABEL=NVIDIA /tmp/mount
    rpm -ivh /tmp/mount/<host_driver>.rpm
    • Replace <host_driver> with the host driver downloaded in step 3.
  6. Customize the overcloud image by attaching the ISO image that you generated in step 4, and running the driver installation script that you created in step 5:

    $ virt-customize --attach nvidia-packages.iso -a overcloud-full-gpu.qcow2  -v --run install_nvidia.sh
    [   0.0] Examining the guest ...
    libguestfs: launch: program=virt-customize
    libguestfs: launch: version=1.36.10rhel=8,release=6.el8_5.2,libvirt
    libguestfs: launch: backend registered: unix
    libguestfs: launch: backend registered: uml
    libguestfs: launch: backend registered: libvirt
  7. Relabel the customized image with SELinux:

    $ virt-customize -a overcloud-full-gpu.qcow2 --selinux-relabel
    [   0.0] Examining the guest ...
    [   2.2] Setting a random seed
    [   2.2] SELinux relabelling
    [  27.4] Finishing off
  8. Prepare the custom image files for upload to the OpenStack Image Service:

    $ mkdir /var/image/x86_64/image
    $ guestmount -a overcloud-full-gpu.qcow2 -i --ro image
    $ cp image/boot/vmlinuz-3.10.0-862.14.4.el8.x86_64 ./overcloud-full-gpu.vmlinuz
    $ cp image/boot/initramfs-3.10.0-862.14.4.el8.x86_64.img ./overcloud-full-gpu.initrd
  9. From the undercloud, upload the custom image to the OpenStack Image Service:

    (undercloud) $ openstack overcloud image upload --update-existing --os-image-name overcloud-full-gpu.qcow2
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