---
tags: Redhat, RHEL
---
# Redhat KVM installation with Tesla T4 Pass Through
###### tags: Redhat, KVM, RHEL

## HW Equipment
SCB 1921
Xeon 6264
16GB*24

## SOP
### Hardware & Software & OS compatebility
https://docs.nvidia.com/grid/latest/product-support-matrix/index.html
### Downloading Source
Download iso file from:
RHEL8 https://access.redhat.com/downloads/content/479/ver=/rhel---8/8.1/x86_64/product-software
RHEL7 https://access.redhat.com/downloads/content/69/ver=/rhel---7/7.9/x86_64/product-software
Always download Red Hat Enterprise Linux Binary DVD file and file size should be in GBs. and While Installation choose server with GUI option
### Manual Partion of Hard Drive
https://www.computernetworkingnotes.com/rhce-study-guide/rhel-installation-step-by-step-explained-with-screenshots.html
### How to install a graphical user interface (GUI) for Red Hat Enterprise Linux
https://access.redhat.com/solutions/5238

### Finish the installtion
### BIOS Setting
1. Socket Configuration > Processor Configuration

vmx  [Enabled]

2. Socket Configuration > IIO Configuration > Intel VT for Directed I/O (VT-d)

Intel VT for Directed I/O (VT-d)   [Enabled]

3. Advanced > PCI subsystem settings

SR-IOV Support [Enabled]

### Open the terminal and Run

su

yum update

> Possible Error "There are no enabled repositories in /etc/yum.repos.d /etc/yum/repos.d /etc/distro.repos.d solved in RHEL"

Solution 1:

1. subscription-manager register 
or 
subscription-manager register --force
"Give the username and password like mine is username: sohail.anjum pw:****"

2. Subscription-manager auto-attach
"Auto-attach preference: enabled"

3. Subscription-manager subscribe
"Product Name: Red Hat Enterprise Linux for x86_64"
"Status: Subscribed"

4. yum update

Solution 2:

"The main problem is that there are no enabled repositories, which can easily be solved the best for you would be to start over from scratch."

"First clean up everything - open a terminal and execute the following commands :"

sudo subscription-manager remove --all
sudo subscription-manager unregister
sudo subscription-manager clean

"Now re-register the system, attach the subscriptions - execute these commands :"

sudo subscription-manager register
sudo subscription-manager refresh
sudo subscription-manager attach --auto

Solution 3:

"Make sure the system time and date is correct"

[root@localhost ~]# date
Mon Mar 30 16:45:20 EDT 2020

"Set the time and date from settings if the about result is not matched with current data and time"

### Verify the CPU virtualization extensions are available

grep -E 'svm|vmx' /proc/cpuinfo

### Analyze the output

### Verify the CPU virtualization VT-d is available

$ lscpu | grep Virtualization

"Virtualization: VT-x"

### Ensure the KVM kernel modules are loaded

lsmod | grep kvm

"kvm_intel            315392  0"
"kvm                  847872  1 kvm_intel"
"irqbypass             16384  1 kvm"

### Installing useful tools for virtual machine management.

 sudo yum -y install virt-top libguestfs-tools

### Start and enable KVM daemon.

 sudo systemctl enable --now libvirtd

### Install Virtual machine Manager GUI – Optional.

sudo yum -y install virt-manager

### Installing Virtualization Packages Manually

 yum install qemu-kvm libvirt
 
 yum install virt-install virt-manager virt-install libvirt-client
 
 yum groupinstall "Virtualization Tools"

### Check the details of NVIDIA devices

$ lspci -vnn | grep -A 13 NVIDIA 
"08:00.0 VGA compatible controller [0300]: NVIDIA Corporation TU106 [GeForce RTX 2060 Rev. A] [10de:1f08] (rev a1) (prog-if 00 [VGA controller])""
	"Kernel driver in use: vfio-pci"
	"Kernel modules: nouveau, nvidia_drm, nvidia"

## Errors
### 1. Unable to verify server's identity: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed, use below steps.

"follow the steps below:"

vi /etc/rhsm/rhsm.conf

"Set to 1 to disable certificate validation:"
insecure = 1

"and Resgiter the system again with username and password. Registration step are above"

### 2.Another app is currently holding the yum lock; waiting for it to exit

"Solution 1:"
rm -f /var/run/ yum.pid

"Solution 2:"
ps aux | grep yum (find out yum-updatesd and yum PID)
kill -9 <yum PID>

### 3. InitRAMFS, Dracut, and the Dracut Emergency Shell

# ls /dev/mapper
"control  rhel-swap"

# lvm lvscan
  "ACTIVE            '/dev/rhel/swap' [3.85 GiB] inherit"
  "inactive          '/dev/rhel/home' [22.85 GiB] inherit"
  "inactive          '/dev/rhel/root' [46.80 GiB] inherit"
  
# lvm lvchange -a y rhel/root

# exit

### Reference
https://github.com/bryansteiner/gpu-passthrough-tutorial