Scaling Out an HPC Cluster

Updated on 2023-10-16 GMT+08:00

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Scenarios

If the HPC cluster does not meet your requirements, you can scale out the cluster.

NOTE:

Only clusters in the Running state can be scaled out.

Procedure

In the navigation pane on the left, choose Clusters.
On the displayed page, locate the row where the cluster you want to scale out resides and click Scale in the Operation column. The scale-out details page is displayed.
Select a billing mode.
NOTE:

During scale-out, you can select a different billing mode for scaled nodes. If the cluster contains both the pay-per-use nodes and yearly/monthly billing nodes, the cluster billing mode is displayed as Yearly/Monthly and Pay-per-use.
- Yearly/Monthly: Specify a required duration. The system will deduct the fees incurred from your account based on the service price.
- Pay-per-use: You do not need to set a required duration because the system will deduct the fees incurred from your account based on the service duration.
Specify Region and AZ.
- By default, the region is unconfigurable and set to the region where the cluster is created.
- You can select a different AZ.
Configure the specifications for new nodes.
- Flavor: Select a flavor from the drop-down list.
- System Disk: Select a disk type and set the disk size.
Configure the network.
VPC, Security Group, and NIC are automatically set to those configured when the cluster was created.
Select an image.
NOTE:

You are advised to select a public image for new nodes. Otherwise, the scale-out may fail.
- Public image (recommended)
  A public image is a standard, widely used image that is visible to all users. It contains an OS and preinstalled public applications. Currently, only CentOS 7 images are available.
- Private image
  A private image is only available to the user who created it. It contains an OS, preinstalled public applications, and the user's personal applications. Using a highly-tailored private image to create cloud servers eliminates the need to manually configure multiple cloud servers repeatedly.
  
  You can also select an encrypted image. For details, see Image Management Service User Guide.
- Shared image
  A shared image is a private image another user has shared with you.
- Marketplace image
  The Marketplace is an online store where you can purchase third-party images that have the OS, application environments, and software preinstalled.

Set Login Mode.

NOTE:

The login mode must be the same as that configured when the cluster was created.

Key pair
A key pair will be used for cloud server login authentication. You can select an existing key pair or create one.

NOTE:

If you use an existing key pair, make sure that you have saved the key file locally. Otherwise, logging in to the cloud servers will fail.

Password

A username and its initial password will be used for cloud server login authentication.

The password must meet the following requirements.

Item	Requirement	Example Value
Password	Consists of 8 to 26 characters. Contains at least three of the following character types: Uppercase letters Lowercase letters Digits Special characters: $!@%-_=+[]:./^,{}? Cannot contain the username or the username spelled backwards.	YNbUwp!dUc9MClnv NOTE: The example password is generated randomly. Do not copy it for use.

Select the amount of time you want to use the nodes for.
If you set Billing Mode to Yearly/Monthly, you need to select the required duration and determine whether to select Auto-renew. If you select Auto-renew, the node will be automatically renewed when the subscription period expires.
Specify Quantity.
The total number of existing and new compute nodes in the cluster cannot exceed 50.
Confirm the configurations and click Buy Now. A page is displayed for you to confirm the order.
- In Yearly/Monthly billing mode, after confirming the specifications and price of the order, agree to the service agreement, click Submit, and complete the payment as prompted.
- In Pay-per-use billing mode, after confirming the specifications and price of the order, agree to the service agreement, and click Submit.
After the order is submitted or paid, the system returns back to the Clusters page where you can see that the cluster is in the Creating state. Wait until the cluster status changes to Running.