AWS pcs: PCS doc history: Slurm 26.05, GRES, MIG, JWT auth notes
Summary
Adds changelog entries for Slurm 26.05 support, custom GRES settings, hardware topology and MIG configuration topics, availability in Asia Pacific (Melbourne), and notes that Slurm REST API reads the username from the `name` field of the `id` JWT claim, deprecating the top-level `sun`, `username`, and `userclaimfield` claims on 26.05+.
Security assessment
The only security-adjacent content is a behavioral note about how the Slurm REST API derives the username from the JWT `id` claim (a change affecting authentication/identity mapping), but the entry is a release/changelog entry rather than a fix for a specific vulnerability, incident, or CVE, so it is informational hardening context.
Evidence
+September 11, 2026 | Support for Slurm 26.05, custom GRES settings, and hardware topology | AWS PCS supports Slurm 26.05. Clusters running 25.11, 25.05, and 24.11 can update directly to 26.05.
Diff
diff --git a/pcs/latest/userguide/doc-history.md b/pcs/latest/userguide/doc-history.md index 7f281e1a3..f127fdc1a 100644 --- a//pcs/latest/userguide/doc-history.md +++ b//pcs/latest/userguide/doc-history.md @@ -12,0 +13,2 @@ Date | Change | Documentation updates | API versions updated +September 11, 2026 | Support for Slurm 26.05, custom GRES settings, and hardware topology | AWS PCS supports Slurm 26.05. Clusters running 25.11, 25.05, and 24.11 can update directly to 26.05. A single sample AMI now supports every Slurm version that is not EOL, and the AMI name no longer contains a Slurm version. For more information, see [Slurm versions in AWS PCS](./slurm-versions.html) and [Release notes for Slurm versions in AWS PCS](./slurm-versions_release-notes.html). You can configure Slurm Generic Resource (GRES) records for a compute node group with the `gresCustomSettings` property, and declare the schedulable GRES with the `Gres` custom Slurm setting. AWS PCS also enables GRES autodetection by default on compute node groups that have GPUs. For more information, see [Configuring custom GRES settings in AWS PCS](./gres-custom-settings.html). The Slurm REST API reads the username from the `name` field within the `id` claim of a JWT. The top-level `sun`, `username`, and custom `userclaimfield` claims are deprecated on Slurm 26.05 and later. For more information, see [Authenticating with Slurm REST API in AWS PCS](./slurm-rest-api-authenticate.html). Added a topic that describes how Slurm models CPU topology and GPU affinity, what AWS PCS configures on each Slurm version, and how to configure the socket layout of a compute node group. A troubleshooting topic for `INVALID_REG` node registrations is also available. For more information, see [Configuring hardware topology in AWS PCS](./hardware-topology.html). Added a topic that describes how to partition NVIDIA GPUs into Multi-Instance GPU (MIG) instances and schedule them as GRES types on a compute node group, including the known limitations for powered-down nodes. For more information, see [Configuring Multi-Instance GPU (MIG) in AWS PCS](./mig-configuration.html). | 2026-09-09 +September 10, 2026 | AWS PCS released in Asia Pacific (Melbourne) | AWS PCS is now available in Asia Pacific (Melbourne) (ap-southeast-4). CloudFormation templates are available to get started in the Asia Pacific (Melbourne) AWS Region. For more information, see [Use CloudFormation to create a sample AWS PCS cluster](./get-started-cfn-create.html) and [CloudFormation templates to create a sample AWS PCS cluster](./get-started-cfn-sample-templates.html). | Not applicable @@ -26,0 +29 @@ July 23, 2026 | Updated AWS PCS agent to version 1.5.0 | Added AWS PCS agent ve +July 31, 2026 | New topic: Slurm configuration | Added a topic that describes how AWS PCS manages the Slurm configuration of a cluster with Slurm configless mode. In this mode, compute nodes and login nodes get their configuration from the cluster controller. For more information, see [Slurm configuration in AWS PCS](./slurm-configuration.html). | Not applicable