Azure CycleCloud Workspace for Slurm is a new solution that simplifies and streamlines the creation and management of Slurm clusters on Azure. Azure CycleCloud Workspace for Slurm is an Azure marketplace solution template that allows users to easily create and configure pre-defined Slurm clusters with Azure CycleCloud, without requiring any prior knowledge of the cloud or Slurm. Slurm clusters will be pre-configured with PMix v4, Pyxis and enroot to support containerized AI Slurm jobs. Users can access the provisioned login node using SSH or Visual Studio Code to perform common tasks like submitting and managing Slurm jobs.
Azure CycleCloud Workspace for Slurm, based on the options choosen will deploy the following resources in your Azure subscription as described in the architecture below.
- a VNET and subnets to host CycleCloud, compute, Bastion and storage,
- a VM with CycleCloud pre-configured, and a System Managed Identity with the right roles granted to create resources,
- a Network Security Group with rules defined and attached to the subnets,
- a storage account used by CycleCloud,
- optionaly an Azure Bastion and it's public IP,
- optionaly a NAT Gateway and it's public IP in order to provide outbound connectivity,
- optionaly an Azure NetApp files account, pool and volume and it's subnet,
- optionaly an Azure Managed Filesystem and it's subnet,
- optionaly a VNET Peering to a provided hub VNET
- Azure CycleCloud Workspace for Slurm
- Table of Contents
Search for Slurm in the Azure Marketplace and click on the Create button.
In this tab you will have to specify where to deploy
- The Resource group options will allow you to create a new resource group or use an existing one.
- The CycleCloud VM Size has been set to a best practice default value.
- The Admin User is the name for the VM and CycleCloud administrator account
- Choose if you provide the public SSH key of the administrator account directly or if stored in an SSH resource in Azure.
Specify where the users' home directory should be located. Create a new Builtin NFS will use the scheduler VM as an NFS server with an attached datadisk.
Create a new Azure NetApp Files will create an ANF account, pool ad volume of the specified capacity and service level.
If you have an existing NFS mount point than select the Use Existing option and specify the settings to use.
If you need to mount an additional file-system for your project data, you can either create a new one or specify an existing one. You can create a new Azure NetApp File volume or an Azure Managed Lustre Filesystem.
If you have an existing NFS mount point or an Azure Managed Lustre Filesystem, you can specify the mount options.
Specify here if you want to create a new Virtual Network and subnets or use an existing one.
Before using an existing virtual network, check for the pre-requisites in Bring your own VNET
Specify the VM size and image to use for the Scheduler and the Login nodes. Images are the HPC Images provided in the Azure Marketplace with the associated URIs:
| Image Name | URI |
|---|---|
| Alma Linux 8.7 | almalinux:almalinux-hpc:8_7-hpc-gen2:latest |
| Ubuntu 20.04 | microsoft-dsvm:ubuntu-hpc:2004:latest |
| Ubuntu 22.04 | microsoft-dsvm:ubuntu-hpc:2204:latest |
Set how many login nodes you want to provision at start and the maximum of them. Finally enabling health check will execute node health checks for HPC and GPU VM types to automatically remove unhealthy nodes when they starts.
Azure CycleCloud Workspace for Slurm comes with 3 defined Slurm partitions :
- HTC : for embarassingly non MPI jobs,
- HPC : for highly coupled MPI jobs mostly using VM types with Infiniband support,
- GPU : for MPI and non MPI GPU jobs
For each you can define the maximum of nodes that CycleCloud will dynamically provisioned based on job demands, as well as which image should be used. Only the HTC partition will allow the use of Spot instances as it's usually not a best practice to use Spot instances for HPC and GPU jobs. However these settings can be overriden after deployment in the CycleCloud UI.
Set the relevant tags for the resources needed.
Review your options, this step will also process to some validations.
When passed, click on the Create button to initialize the deployment
Follow the deployment status and steps.
Connect to the ccw-cyclecloud-vm using Bastion with the username and SSH keys specified during the deployment.
When connected, check the cloud-init logs to verify everything is correct.
$tail -f -n 25 /var/log/cloud-init-output.log
Waiting for Azure.MachineType to be populated...
Waiting for Azure.MachineType to be populated...
Waiting for Azure.MachineType to be populated...
Waiting for Azure.MachineType to be populated...
Waiting for Azure.MachineType to be populated...
Waiting for Azure.MachineType to be populated...
Waiting for Azure.MachineType to be populated...
Waiting for Azure.MachineType to be populated...
Waiting for Azure.MachineType to be populated...
Waiting for Azure.MachineType to be populated...
Waiting for Azure.MachineType to be populated...
Waiting for Azure.MachineType to be populated...
Starting cluster ccw....
----------------------------
ccw : allocation -> started
----------------------------
Resource group:
Cluster nodes:
scheduler: Off -- --
Total nodes: 1
CC start_cluster successful
/
exiting after install
Cloud-init v. 23.4-7.el8_10.alma.1 running 'modules:final' at Wed, 12 Jun 2024 10:15:53 +0000. Up 11.84 seconds.
Cloud-init v. 23.4-7.el8_10.alma.1 finished at Wed, 12 Jun 2024 10:28:15 +0000. Datasource DataSourceAzure [seed=/dev/sr0]. Up 754.29 secondsThen establish the connectivity between your client machine and the CycleCloud VM. This can be from your corporate IT, a VPN, a bastion tunnelling, an attached public IP if your company allows it. Connect to the web interface by browsing to https://<cycleccloud_ip>, and authenticate with the username and password provided during the deployment. Confirm that both the Scheduler and the Login node are running.
When using the bastion, use one of the utility script util/ssh_thru_bastion.sh or util/tunnel_thru_bastion.sh to connect. If not using a bastion, you have to establish the direct connectivity yourself.
If you bring your own VNET you have to follow these pre-requisistes :
- a /29 cyclecloud subnet for the CycleCloud VM, with
Microsoft.StorageService Endpoint assigned, - a compute subnet for the nodes, with
Microsoft.StorageService Endpoint assigned. This is where the scheduler, login and compute nodes will be created - when using Azure NetApp File, a dedicated netapp subnet with the
Microsoft.NetApp/volumesdelegation as documented here - when using Azure Managed Lustre Filesystem, a dedicated lustre subnet with a CIDR based on the storage capacity to provision as documented here
- if deploying a Bastion, a dedicated BastionSubnet as documented here
- Your NSGs, should allow communications between subnets as defined in the bicep/network-new.bicep file.
Deleting the resource group will delete all of the resources that CCW has created, however role assignments are not deleted. To fix this, we provide util/delete_roles.sh which will delete these roles for either a deleted resource group, or one where the resources were manually deleted.
util/./delete_rules.sh --location my-location --resource-group my-ccw-rg [--delete-resource-group]Note the option --delete-resource-group - unfortunately, we actually have to recreate the resource group and create a simple deployment that outputs the guid names that we produce for this given resource group name and location. Passing in --delete-resource-group will clean up this resource group, whether we have created the resource group or not.
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