CentOS 7.x Install nvidia drivers and cuda library

To install Nvidia drivers and Cuda library on CentOS 7.x use:

Disable firewalld

systemctl stop firewalld
systemctl disable firewalld

Install EPEL & DKMS

yum install epel-release -y
yum install kernel-devel epel-release dkms

Full update
```
yum update -y
```
In CentOS7, Default there is no xorg.conf file. Take backup if you found.
```
cd /etc/X11/
cp xorg.conf original-xorg-conf
```
In CentOS7, NVIDIA card uses NOUVEAU open source driver. Check with below command
```
lshw -numeric -C display
```
Diable this open source driver at kernel level by editing '/etc/default/grub' with:
```
GRUB_CMDLINE_LINUX="crashkernel=auto rhgb quiet nouveau.modeset=0"
```

Apply new GRUB configuration using

grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg

On non-EFI systems above command could be:

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

Reboot the and make sure GUI works properly
```
shutdown -r now
```
Verify NVIDIA card not using nouveau driver
```
lshw -numeric -C display
```
Download the gpu card drivers repo file for compatible OS from https://www.nvidia.com/Download/index.aspx?lang=en-us
If you dont want the latest cuda (12.2 at time of this writing) then we can go for download page for specific version of cuda and use that. For example for cuda-10.2 link is https://developer.nvidia.com/cuda-10.0-download-archive

Install the downloaded repo

yum -y localinstall nvidia-driver-local-repo-rhel7-515.48.07-1.0-1.x86_64.rpm

Change to run level 3
```
systemctl isolate multi-user.target
```
Install the cuda drivers
```
yum install nvidia-kmod cuda-drivers
```
If any nvidia.conf files in /etc/X11/ or /etc/X11/xorg.conf.d/, comment all the lines.
Remove any xorg.conf file. No need to create any xorg.conf file with busid
Reboot the gpu node
```
shutdown -r now
```
Check the gpu card status using:
```
nvidia-smi
```
If you able to execute the above command and able to see the nvidia card details, then drivers were installed properly.
Download correct version of CUDA repo rpm file from https://developer.nvidia.com/cuda-downloads
Install cuda using:
```
yum localinstall cuda-repo-rhel7-10-0-local-10.0.130-410.48-1.0-1.x86_64.rpm
yum install cuda
```
In case of gpg errors we can use 'yum -y --nogpgcheck install cuda' as cuda-sanitizer package is perhaps not signed properly via the key.
Check cuda version using:
```
ls /usr/local/cuda*
```

Export system path to Nvidia CUDA binary executables by editing '/etc/bashrc' with:

export PATH=/usr/local/cuda-<ver>/bin${PATH:+:${PATH}}
export LD_LIBRARY_PATH=/usr/local/cuda-<ver>/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}

Read updated bashrc file in current shell using:
```
source /etc/bashrc
ldconfig
```
Check cuda version details with the below command
```
nvcc --version
```

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