Install Nvidia Drivers on RHEL¶

This section will provide instructions on installing Nvidia drivers in an RHEL environment, if the target servers have Nvidia GPUs.

Disable Secure Boot and SELinux¶

Note

Disabling Secure Boot and SELinux may not be necessary for every setup.

The Nvidia drivers are installed by compiling and installing kernel modules. If they are not signed by a trusted source, then you will not be able to use secure boot. Consequently, you will likely want to disable secure boot in the BIOS of your server. To do so, you will need to (re)boot your server and enter the BIOS menus.

Similarly, SELinux tends to interfere with Nvidia driver installation and should be disabled by editing the /etc/sysconfig/selinux configuration file and changing the SELINUX line to:

SELINUX=disabled

Ensure the GPUs are Installed¶

Ensure that the lspci command is installed (which lists the PCI devices connected to the server):

sudo yum -y install pciutils

Perform a quick check to determine what Nvidia cards have been installed:

lspci | grep -e VGA -ie NVIDIA

The output of the lspci command above should be something similar to:

00:02.0 VGA compatible controller: Intel Corporation 4th Gen ...
01:00.0 VGA compatible controller: Nvidia Corporation ...

If you do not see a line that includes Nvidia, then the GPU is not properly installed. Otherwise, you should see the make and model of the GPU devices that are installed.

Disable Nouveau¶

Blacklist Nouveau in Modprobe¶

The nouveau driver is an alternative to the Nvidia drivers generally installed on the server. It does not work with CUDA and must be disabled. The first step is to edit the file at /etc/modprobe.d/blacklist-nouveau.conf. Something like:

cat <<EOF | sudo tee /etc/modprobe.d/blacklist-nouveau.conf
blacklist nouveau
options nouveau modeset=0
EOF

Update Grub to Blacklist Nouveau¶

On RHEL 6

Backup your grub config:
```
sudo cp /boot/grub/grub.conf /boot/grub/grub.conf.bak
```
Edit your grub config and add rdblacklist=nouveau to the end of any lines starting with kernel. For example:
```
kernel /vmlinuz-... quiet rdblacklist=nouveau
```

On RHEL 7

Backup your grub config templates:

sudo cp /etc/sysconfig/grub /etc/sysconfig/grub.bak

Then, update your grub config template at /etc/sysconfig/grub. Add rd.driver.blacklist=grub.nouveau to the GRUB_CMDLINE_LINUX variable. For example, change:

GRUB_CMDLINE_LINUX="crashkernel=auto ... quiet"

to:

GRUB_CMDLINE_LINUX="crashkernel=auto ... quiet rd.driver.blacklist=grub.nouveau"

Then, rebuild your grub config:

sudo grub2-mkconfig -o /boot/grub2/grub.cfg

Regenerate the Initramfs Image¶

Backup the old initramfs image, generate a new initramfs image, disable any graphical logins and reboot the server:

sudo mv /boot/initramfs-$(uname -r).img /boot/initramfs-$(uname -r)-nouveau.img
sudo dracut /boot/initramfs-$(uname -r).img $(uname -r)

Exiting X¶

The Nvidia driver will not allow you to install a new driver while X is open, so if X is enabled, it must first be exited. The simplest way to exit X is to switch to a TTY console using Ctrl-Alt-F1, login, and run:

sudo init 3

After that has completed, X may be disabled so that the system does not attempt to start X in the case where the system has rebooted, but the driver has not finished installing. First, determine which graphical login your server uses:

ps aux | grep -v 'grep' | grep 'lightdm|gdm|kdm'

On RHEL 6

Disable the graphical login and reboot as follows (adjust for the login manager that is running):
```
echo  "manual" | sudo tee -a /etc/init/lightdm.override
sudo reboot now
```
On RHEL 7

Disable the graphical login as follows (adjust for the login manager that is running):
```
sudo systemctl disable lightdm
sudo reboot now
```

After the system reboots, it should no longer start up with a graphical login. The graphical login will be re-enabled after completing the Nvidia driver installation.

Ensure the Nouveau Driver is Disabled¶

After the reboot has completed, check to ensure that the nouveau driver has been disabled:

lsmod | grep "nouveau" > /dev/null && echo "WARNING: nouveau still active" || echo "Success"

If nouveau is still active, then run the following command and repeat the above check to ensure that Nouveau has been removed:

sudo rmmod nouveau

Check if nouveau is installed as an RPM:

rpm -qa | grep xorg-x11-drv-nouveau

If the RPM is installed, then run the following command to uninstall it:

sudo yum remove xorg-x11-drv-nouveau

Prerequisites¶

Several prerequisites should be installed before installing the Nvidia drivers.

Install the EPEL repo:
```
yum install epel-release
```
Upgrade the kernel and restart the machine:
```
yum upgrade kernel
sudo reboot now
```

Install the dependencies:

sudo yum -y install kernel-devel kernel-headers gcc dkms acpid

Install Drivers Only¶

Important

To accommodate GL-accelerated rendering, OpenGL and GL Vendor Neutral Dispatch (GLVND) are now required and should be installed with the Nvidia drivers. OpenGL is an installation option in the *.run type of drivers. In other types of the drivers, OpenGL is enabled by default in most modern versions (dated 2016 and later). GLVND can be installed using the installer menus or via the --glvnd-glx-client command line flag.

This section deals with installing the drivers via the *.run executables provided by Nvidia.

To download only the drivers, navigate to http://www.nvidia.com/object/unix.html and click the Latest Long Lived Branch version under the appropriate CPU architecture. On the ensuing page, click Download and then click Agree and Download on the page that follows.

Note

The Unix drivers found in the link above are also compatible with all Nvidia Tesla models.

If you'd prefer to download the full driver repository, Nvidia provides a tool to recommend the most recent available driver for your graphics card at http://www.Nvidia.com/Download/index.aspx?lang=en-us.

If you are unsure which Nvidia devices are installed, the lspci command should give you that information:

lspci | grep -e VGA -ie NVIDIA

Download the recommended driver executable. Change the file permissions to allow execution:

chmod +x ./NVIDIA-Linux-$(uname -m)-*.run

Run the install. If you are prompted about cryptographic signatures on the kernel module, answer Sign the Kernel Module and then Generate a new key pair. At the end, DO NOT update your X config if it asks. Note that the following attempts to diagnose a common problem where the installer fails to correctly detect and deal with the situation where the kernel has been signed, but signed kernel modules are not required.

grep CONFIG_MODULE_SIG=y /boot/config-$(uname -r) && \
grep "CONFIG_MODULE_SIG_FORCE is not set" /boot/config-$(uname -r) && \
sudo ./NVIDIA-Linux-$(uname -m)-*.run -e || \
sudo ./NVIDIA-Linux-$(uname -m)-*.run

If there are any issues with the installation, the installer should notify you where the log is kept; the default location is usually:

/var/logs/nvidia-installer.log

Troubleshoot the Nvidia Installer¶

One common issue with installing the Nvidia driver is that it will fail out because the Nvidia driver taints the kernel. The issue is that the driver is not signed and the default install does not attempt to sign it, but the kernel is expecting a signed driver. If you encounter this error, you should re-run the install in expert mode:

sudo ./nvidia-Linux-<arch>-<version>.run -e

When prompted about cryptographic signatures on the kernel module, answer Sign the Kernel Module and then Generate a new key pair. Again, at the end, make sure to answer No when asked if you want the installer to update your X configuration.

This situation is usually detected during the above install step, but if there are issues, you can run this command separately.

Another issue that may arise is that if the kernel-devel version and the system kernel version don't match up, the Nvidia driver install will not proceed after accepting the license. To fix this issue:

yum update
sudo reboot now

Other Reference Material¶

Nvidia has a large readme online at:

http://us.download.nvidia.com/XFree86/Linux-<arch>/<version>/README/index.html

For example, on x86 for version 375.26, the readme is online at:

http://us.download.nvidia.com/XFree86/Linux-x86_64/375.26/README/index.html.

Test the Nvidia Installation¶

After the Nvidia drivers are installed, you can test the installation by running the command:

nvidia-smi

Which should return something similar to:

+------------------------------------------------------+
| NVIDIA-SMI 361.42     Driver Version: 361.42         |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  Quadro K1100M       Off  | 0000:01:00.0     Off |                  N/A |
| N/A   44C    P0    N/A /  N/A |      8MiB /  2047MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID  Type  Process name                               Usage      |
|=============================================================================|
|  No running processes found                                                 |
+-----------------------------------------------------------------------------+

Multiple Driver Failure¶

If an error is returned, stating:

Failed to initialize NVML: GPU access blocked by the operating system

there may be multiple versions of the Nvidia drivers on the system. Try running:

rpm -qa | grep -E "cuda|nvidia"

Review any versions listed and remove them as needed. Also run:

locate libnvidia | grep ".so."

Confirm that the files all end with either a 1 or the version of the Nvidia driver that you installed, for example .375.21.

Restart X Server¶

Enable X¶

If you disabled the X Server to install your Nvidia driver, enable it now. First, check which service is responsible for the X Server:

ps aux | grep -v 'grep' | grep 'lightdm|gdm|kdm'

The following will enable the lightdm service, for the case where lightdm is responsible for the X Server . Adjust for the particular service running on your server from the above command.

On RHEL 6:
```
sudo rm -f /etc/init/lightdm.override
```
On RHEL 7:
```
sudo systemctl enable lightdm
```

Reboot¶

Then, the simplest way to get back into X is to reboot the server:

sudo reboot now

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