Update an AWS PCS cluster

Use these steps to modify scheduler settings, accounting configuration, and Slurm custom settings on your cluster. For more information, see Custom Slurm settings for AWS PCS clusters.

Prerequisites

• Cluster must be in ACTIVE, UPDATE_FAILED, or SUSPENDED state

• All associated resources (Queues, Compute Node Groups) must be in ACTIVE state

• No other update operations can be in progress

Procedure

AWS Management Console

1. Open the AWS PCS console at https://console.aws.amazon.com/pcs/.

2. In the navigation pane, choose Clusters.

3. Select the cluster to update.

4. Choose Edit.

5. On the Edit cluster page, modify the desired settings:

   • Under Scheduler configuration, update Scale-down idle time to control how long dynamic instances remain idle before automatic termination.

   • Modify Prolog, Epilog, and Select-type parameters settings as needed.

   • Enable, disable, or configure retention time for managed accounting.

   • Under Additional scheduler settings, add, edit, or remove Slurm custom settings. For more information about supported parameters, see Custom Slurm settings for AWS PCS clusters.

   Note

   Fields that cannot be edited display as read-only and show their current values.

6. Choose Update to submit the changes.

7. Monitor the cluster status, which shows as "Updating" during the process. The status changes when the update completes successfully.

AWS CLI

1. Open a terminal or command prompt.

2. Verify the cluster status using the following command:

   aws pcs get-cluster --cluster-identifier my-cluster

3. Submit an update request using one of the following examples:

   • To enable managed accounting:

     aws pcs update-cluster --cluster-identifier my-cluster \
     --slurm-configuration 'accounting={mode=STANDARD}'

   • To update a Slurm Prolog setting:

     aws pcs update-cluster --cluster-identifier my-cluster \
     --slurm-configuration \
     'SlurmCustomSettings=[{parameterName=Prolog,parameterValue="/path/to/prolog.sh"}]'

   • To update scale-down idle time:

     aws pcs update-cluster --cluster-identifier my-cluster \
     --slurm-configuration 'scaleDownIdleTimeInSeconds=300'

4. Monitor update progress by checking cluster status:

   aws pcs get-cluster --cluster-identifier my-cluster

After a successful update request, the command returns the Cluster object with all changes. The cluster status changes from UPDATING to ACTIVE when complete.