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AWS parallelcluster: Add RHEL 9 custom AMI support notes and rename TOC entry

Service: parallelcluster · 2026-09-27 · Documentation low

File: parallelcluster/latest/ug/operating-systems-v3.md

Summary

Documents AWS ParallelCluster 3.9.0 support for RHEL 9 custom AMIs, including FSx for Lustre kernel compatibility and EUS minor release requirements, and renames a reference TOC entry to 'Patch the operating system of a cluster'.

Security assessment

The added content is OS/platform support guidance (kernel and repository requirements) with no authentication, encryption, or credential implications; it merely informs users how to build a valid RHEL 9 AMI.

Evidence

+A note that FSx for Lustre client kernel compatibility and EUS repository availability are build requirements for RHEL 9 custom AMIs.

Diff

diff --git a/parallelcluster/latest/ug/operating-systems-v3.md b/parallelcluster/latest/ug/operating-systems-v3.md
index 08f15b077..a40887f73 100644
--- a//parallelcluster/latest/ug/operating-systems-v3.md
+++ b//parallelcluster/latest/ug/operating-systems-v3.md
@@ -32,0 +33,11 @@ To build your custom AMI from a base Rocky Linux 8 AMI, you can consider subscri
+**RHEL 9**
+
+AWS ParallelCluster 3.9.0 supports Red Hat Enterprise Linux 9 (RHEL 9). To build a custom RHEL 9 AMI, use a base AMI that meets the following requirements:
+
+  * The FSx for Lustre client supports the kernel of the base AMI. For the supported kernels, see [Lustre file system and client kernel compatibility](https://docs.aws.amazon.com/fsx/latest/LustreGuide/lustre-client-matrix.html) in the _FSx for Lustre User Guide_.
+
+  * The base AMI runs a minor release that is not in Extended Update Support (EUS). EUS minor releases receive their kernels from the EUS repositories, which are disabled by default. As a result, the packages that match the kernel can't be installed during the build.
+
+
+
+
@@ -58 +69 @@ AMI patching and Amazon EC2 instance replacement
-Reference for AWS ParallelCluster
+Patch the operating system of a cluster