CentOS Stream 9¶

Release status¶

CentOS Stream 9 was made available upstream on the 03.12.2021
CentOS Stream 9 was made available at CERN on the 09.02.2022 and is currently a supported operating system, until the end of life of the upstream product which will be ~31.12.2026

How does CERN use CentOS Stream 9?¶

System updates¶

CentOS Stream 9 updates are staged

A 'production' repository is provided, which most systems will use and is updated once per week (except for critical security vulnerability patches)
A 'testing' repository is also provided which is updated daily
Snapshots of CentOS repositories are performed daily and can be found at this URL
The 'cern-yum-tool' is a new package that can be used to easily switch between 'production', 'testing' or 'snapshot' repositories
The 'yum-autoupdate' package is provided for automatic (distro-sync) updates (the same as CC7).

Modified packages¶

centos-stream-release:
- Yum repositories files changed to use http://linuxsoft.cern.ch/cern/centos/s9/
centos-gpg-keys:
- Added CERN Koji RPM signing keys
epel-release:
- Yum repositories files changed to use http://linuxsoft.cern.ch/

Note: Unless otherwise stated above, CentOS Stream 9 packages (rpms) are the very same packages released by the upstream CentOS team.

Deployment / Howto¶

Documentation is in the process of being updated. Currently there are not too many major differences between CentOS Stream 9 and CentOS Stream 8, thus the documentation for CentOS Stream 8 may be helpful.