Evaluation of Linux Distribution Options by CERN and Fermilab
CERN and Fermilab are evaluating Linux distribution options and have decided to target CentOS Stream 8 as the standard distribution for experiments. Red Hat has proposed an academic licensing scheme, but concerns exist about its applicability. CentOS Stream 8 is considered low risk and has been running without issues, with support until May 2024. Migration paths are available, and support for existing workloads on Scientific Linux 7 and CERN CentOS 7 will continue as planned.
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Linux Options NO A/SCD Workshop October 5, 2021
The Plan as of November 2020 2020 H1 2020 H2 2021 H1 2021 H2 2022 H1 2022 H2 2023 H1 2023 H2 2024 H1 2024 H2 2025 H1 2025 H2 2026 H1 2026 H2 2027 H1 2027 H2 2028 H1 2028 H2 2029 H1 SLF6 SL7 C8 SLF6: Scientific Linux Fermi 6 SL7: Scientific Linux 7 C8: CentOS Linux 8 2 9/29/2024
December 2020 2020 H1 2020 H2 2021 H1 2021 H2 2022 H1 2022 H2 2023 H1 2023 H2 2024 H1 2024 H2 2025 H1 2025 H2 2026 H1 2026 H2 2027 H1 2027 H2 2028 H1 2028 H2 2029 H1 SLF6 SL7 C8 CS8 CS9 SLF6: Scientific Linux Fermi 6 SL7: Scientific Linux 7 C8: CentOS Linux 8 CS8: CentOS Stream 8 CS9: CentOS Stream 9 3 9/29/2024
CentOS Stream Not a beta version: Each package that goes into Stream will appear as-is in the next RHEL minor version release. Key differences from CentOS Linux: 5-year life cycle (vs. 10 years for CentOS Linux 7) Once they pass QA, new versions of packages are released immediately. For CentOS Linux (and RHEL), they re collected internally until the next minor (dot) version is released. Adds a mechanism to feed changes into RHEL 4 9/29/2024
Options We ve worked with CERN to consider possible options: Use CentOS Stream Use a RHEL rebuild: Springdale Linux, Rocky Linux, AlmaLinux, Revive Scientific Linux Purchase RHEL Academic licensing offer Other options might be possible in the longer term, but not considering for now: Fedora, Debian, etc. 5 9/29/2024
CERN / Fermilab Joint statement CERN and Fermilab have been closely evaluating the Linux distribution landscape. We observe that national cyber infrastructure organizations are increasingly supporting more science domains, so in addition to LHC- or HEP-specific considerations, it will be useful to have a choice that is widely recognized and meets the needs of broader science research. Red Hat has made a proposal to CERN regarding an academic licensing scheme. Ultimately this would require significant overhead at external sites, and therefore we have worries on this proposal s attractiveness for other sites. Going forward, we propose to target CentOS Stream 8 as the standard distribution for experiments. We feel that deploying CentOS Stream 8 is low risk, and we now have months of experience running IT services and experiment offline workloads on CentOS Stream 8 without any significant issues. We feel that should issues arise with the adoption of CentOS Stream 8, it would be straightforward to reevaluate other options before CentOS Stream 8 support ends. CentOS Stream 8 is a supported distribution until May 2024. Trivial migration paths are provided by the various ELC (Enterprise Linux Clone) communities. Continued support for existing workloads on Scientific Linux 7 and CERN CentOS 7 will be maintained as previously planned. 6 9/29/2024
