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AWS parallelcluster medium security documentation change

Service: parallelcluster · 2026-06-04 · Security-related medium

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

Summary

Removed Ubuntu 20.04 support and added Amazon Linux 2 EOL notice

Security assessment

Documents end-of-life (EOL) for Amazon Linux 2 with explicit security implications: 'will no longer receive security patches or bug fixes after EOL'. This addresses future security risks.

Diff

diff --git a/parallelcluster/latest/ug/operating-systems-v3.md b/parallelcluster/latest/ug/operating-systems-v3.md
index abfa505f8..f0fcd0e28 100644
--- a//parallelcluster/latest/ug/operating-systems-v3.md
+++ b//parallelcluster/latest/ug/operating-systems-v3.md
@@ -11 +11 @@ Operating system considerations
-AWS ParallelCluster supports Amazon Linux 2, Amazon Linux 2023, Ubuntu24.04, Ubuntu 22.04, Ubuntu 20.04, Red Hat Enterprise Linux 8 (RHEL8), Rocky 8, Red Hat Enterprise Linux 9 (RHEL9), and Rocky 9. AWS ParallelCluster offers pre-built AMIs for select operating systems, for more details on AMIs provided by AWS ParallelCluster refer to [Image section](./Image-v3.html).
+AWS ParallelCluster supports Amazon Linux 2, Amazon Linux 2023, Ubuntu 24.04, Ubuntu 22.04, Red Hat Enterprise Linux 8 (RHEL8), Rocky 8, Red Hat Enterprise Linux 9 (RHEL9), and Rocky 9. AWS ParallelCluster offers pre-built AMIs for select operating systems, for more details on AMIs provided by AWS ParallelCluster refer to [Image section](./Image-v3.html).
@@ -45,0 +46,4 @@ AWS ParallelCluster 3.9.0 supports Rocky Linux 9, but pre-built Rocky Linux 9 AM
+**Amazon Linux 2**
+
+AWS ParallelCluster 3.15 is the last version to include `alinux2` support. Amazon Linux 2 reaches End of Life (EOL) on 2026-06-30 (see [Amazon Linux 2 FAQs ](https://aws.amazon.com/amazon-linux-2/faqs/)) and will no longer receive security patches or bug fixes after EOL. 
+