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

Install the downloaded repo

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

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

export PATH=/usr/local/cuda-9.0/bin${PATH:+:${PATH}}
export LD_LIBRARY_PATH=/usr/local/cuda-9.0/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}

Read updated bashrc file in current shell using:
```
source ~/.bashrc
```
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 and cuda version details with the below command
```
nvidia-smi
nvcc --version
```
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

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