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Azure CycleCloud Template for building a cluster with pbs with mount points needed for apps in azurehpc

Pre-requisites:

An installed and setup Azure CycleCloud Application Server (instructions here or using the azurehpc script)
The Azure CycleCloud CLI (instructions here)

Overview

This guide will go through the steps required to extend the Azure CycleCloud PBS Pro template ready for installing and running azurehpc app benchmarks.

If you do not wish to follow the steps you can use the version in this repo by running the following commands:

pushd mycluster
NOTE: you can edit the default/cluster-init/scripts/01_install_packages script to add any dependency or custom steps before you proceed
cyclecloud project upload <insert-locker-name>
popd
cyclecloud import_template -f pbspro.txt

Note: you can view your lockers with cyclecloud locker list

Creating the cluster in Azure CycleCloud

A few changes to the default PBS project are required:

Stop the Linux Agent on the execute VMs

We will stop the Linux Agent on the execute nodes in the cluster as this can impact performance at the large scale for a tightly coupled MPI application when running with all the cores.
Export the scratch disk on the master node

The standard PBS project has an NFS server on the master node but this exports directories from the OS disk associated which is only 30GB in size. This is sufficient for the application binaries but the larger benchmark would exceed this. The master will be updated to export the local disk in the VM. Note: a local disk should only be used for scratch data.

Creating a project

First make sure you know the name of you Azure CycleCloud locker:

$ cyclecloud locker list
azure-storage (az://azurecyclestorage/cyclecloud)

In my setup it is called azure-storage.

Now create the project:

$ cyclecloud project init mycluster
Project 'mycluster' initialized in /home/user/cyclecloud-simple-pbs/mycluster
Default locker: azure-storage

Change to the new project directory to complete the steps that follow:

cd mycluster

Add a default cluster init for the project where we install any dependency:

$ cat <<EOF >>specs/default/cluster-init/scripts/01_install_packages.sh
#!/bin/bash

#you can add your custom steps here
EOF
$ chmod +x specs/default/cluster-init/scripts/01_install_packages.sh

We create a new project spec to disable the Linux Agent that we can apply to the execute nodes. Create this as follows:

$ cyclecloud project add_spec disable-agent
Spec disable-agent added to project!

Add a script in the cluster init:

$ cat <<EOF >>specs/disable-agent/cluster-init/scripts/01-disable-agent.sh
#!/bin/bash

systemctl stop waagent
EOF
$ chmod +x specs/disable-agent/cluster-init/scripts/01-disable-agent.sh

Next, create another spec for the master to add a symlink for /scratch and change the permissions to allow write access by everyone:

$ cyclecloud project add_spec scratch-setup
Spec scratch-setup added to project!

Add the cluster init script:

$ cat <<EOF >>specs/scratch-setup/cluster-init/scripts/01-scratch-setup.sh
#!/bin/bash

chmod a+rwx /mnt/resource
ln -s /mnt/resource /scratch
EOF
$ chmod +x specs/scratch-setup/cluster-init/scripts/01-scratch-setup.sh

Now, upload the project:

$ cyclecloud project upload
Uploading to az://azurecyclestorage/cyclecloud/projects/mycluster/1.0.0 (100%)
Uploading to az://azurecyclestorage/cyclecloud/projects/mycluster/blobs (100%)
Upload complete!

Create the template

The PBS template can be used as a basis and updated for the required changes:

wget https://raw.githubusercontent.com/Azure/cyclecloud-pbspro/master/templates/pbspro.txt

Update the template file with the following changes:

Change the template name

Change the for the top-level section:
```
 [cluster PBSProCustom]
```
Install libXt on all VMs

Add the following line in section under [[node defaults]] and [[[configuration]]]:
```
 [[[cluster-init mycluster:default:1.0.0]]]
```
Stop the Linux Agent on the execute VMs

Add the following line in the section under [[nodearray execute]] and [[[configuration]]]:
```
 [[[cluster-init mycluster:disable-agent:1.0.0]]]
```

NFS Server

Add the following line in the section under [[node master]] and [[[configuration]]]:

 [[[configuration cyclecloud.exports.nfs_data]]]
 type = nfs
 export_path = /mnt/resource

NFS Client

Add the following line in the section under [[nodearray execute]] and [[[configuration]]]:

 [[[configuration cyclecloud.exports.nfs_data]]]
 type = nfs
 mountpoint = /scratch
 export_path = /mnt/resource

Set up the scratch directory on the master

Add the following line in the section under [[node master]] and [[[configuration]]]:
```
 [[[cluster-init mycluster:scratch-setup:1.0.0]]]
```

Finally, upload the new template:

$ cyclecloud import_template -f pbspro.txt
Importing default template in pbsprocustom.txt....
-------------------------
PBSProCustom : *template*
-------------------------
Resource group:
Cluster nodes:
    master: Off -- --
Total nodes: 1

The new template will now show in the Azure CycleCloud webpage.