AWS PCS agent versions - AWS PCS

AWS PCS agent versions

The AWS PCS agent software configures the EC2 instances AWS PCS launches for use with Slurm. You include the agent in an Amazon Machine Images (AMI) that you specify when you create compute node groups for your cluster. The EC2 instances launched in those compute node groups use the specified AMI and its included AWS PCS agent software. The AWS PCS agent enables an EC2 instance to register itself as part of the cluster. To use the latest AWS PCS agent software, you must update your custom AMIs. For more information, see Step 2 – Install the AWS PCS agent in Custom Amazon Machine Images (AMIs) for AWS PCS.

AWS PCS agent version Release date Release notes
v1.2.2-1 October 16, 2025

  • Allowed instance metadata queries to an IPv6 endpoint if an IPv4 endpoint isn't available.

  • Fixed an issue that prevented hyperthreading from being disabled if the kernel returned sibling threads as CPU ID ranges.

  • Fixed an issue that produced false failure messages in logs when hyperthreading was successfully disabled.
v1.2.1-1 June 19, 2025

  • The AWS PCS agent now tries to start slurmd for up to 30 minutes if the controller isn't available.

  • Fixed an issue that produced an incorrect slurmd configuration if the response to RegisterComputeNodeGroupInstance contained a SLURMDBD endpoint.
v1.2.0-1 March 7, 2025

  • Enabled support for IPv6 in slurmd.conf.
v1.1.1-1 December 13, 2024

  • Fixed an issue where an incorrect Slurm version was reported in the call to RegisterComputeNodeGroupInstance.

  • Fixed an issue where instance metadata wasn't fetched correctly if a custom script in /opt/aws/pcs/etc/bootstrap_hooks/ was executed.
v1.1.0-1 December 6, 2024

  • Enabled custom scripts in /opt/aws/pcs/etc/bootstrap_hooks/ to run before bootstrap steps.
v1.0.1-1 October 22, 2024

  • Fixed an issue where NVIDIA devices didn't work when slurmd started on GPU-enabled instances.
v1.0.0-1 August 28, 2024

  • Initial release.