add rhel instructions

README.md

@@ -17,6 +17,28 @@
 
 This repository contains installation scripts for HPC images in Azure Marketplace.
 
+## Preparing HPC Red Hat Enterprise Linux Image
+
+Red Hat publishes a collection of marketplace images for different 
+applications and licensing models. To use RHEL and get all the software and drivers
+included in the azhpc-images we recommend that you build a custom image using 
+the scripts in this repository.
+
+The following usage has been verified using the RHEL 7.9 marketplace image 
+`RedHat:RHEL:79-gen2:7.9.2021121602`
+and a Standard_NC6s_v2 VM. Create a VM with this configuration
+and use the script contained in this project.
+
+```bash
+sudo ./rhel-hpc-7_9-install.sh
+```
+
+Once this command is run successfully, then you can use the documented procedure
+for [capturing a linux image](https://docs.microsoft.com/azure/virtual-machines/linux/capture-image).
+
+>Note: Accelerated Networking with IB networking isn't
+supported in the RHEL-HPC prepared image. Use `AcceleratedNetworking = False`.
+
 
 # Contributing
 

rhel-hpc-7_9-install.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -ex
+
+lvextend -L +5G /dev/mapper/rootvg-optlv
+lvextend -L +5G /dev/mapper/rootvg-usrlv
+lvextend -L +8G /dev/mapper/rootvg-tmplv
+
+xfs_growfs /dev/mapper/rootvg-optlv
+xfs_growfs /dev/mapper/rootvg-usrlv
+xfs_growfs /dev/mapper/rootvg-tmplv
+
+cd /mnt/
+
+wget https://github.com/Azure/azhpc-images/archive/refs/heads/master.zip
+unzip master.zip 
+
+cd azhpc-images-master/centos/centos-7.x/centos-7.9-hpc/
+
+# Allows to install to proceed without NVLink.
+sed -i 's/systemctl start nvidia-fabricmanager/systemctl start nvidia-fabricmanager || echo "systemctl start nvidia-fabricmanager failed. Does this machine have NVSwitch?"/g' ../common/install_nvidiagpudriver.sh
+
+# AccelNet with IB is not supported for RedHat
+sed -i 's/^$COMMON_DIR\/install_azure_persistent_rdma_naming.sh/#$COMMON_DIR\/install_azure_persistent_rdma_naming.sh/g' install.sh
+
+bash ./install.sh