THE European Organisation for Nuclear Research (CERN) has announced a major operating-system migration for its accelerator control fleet, moving over 2,200 industrial computers and embedded devices to Debian 13 by the end of 2026. The machines form the front-end control layer of the Large Hadron Collider complex, which covers roughly 43 square kilometres and connects to more than 17,000 devices.
The move away from Red Hat-based systems is driven by Red Hat’s higher processor baseline requirements, which would have forced extensive hardware refreshes for CERN’s ageing equipment.
The plan centres on transferring from RHEL-derived distributions (including AlmaLinux) to Debian 13, because Debian 13 maintains a lower instruction-set baseline and would allow the current hardware to continue operating without a major rebuild. CERN notes several toolchain and workflow challenges, including the absence of certain automated-build and package-publishing tools in Debian and limited support for multiple concurrent package versions.
The data-centre and other compute environments will reportedly remain on Red Hat ecosystems. Hardware limitations remain a consideration: roughly 47% of CERN’s accelerator-control machines use v1-class processors, which would not meet newer baseline requirements. CERN estimates that hardware replacements could cost about CHF 5.4 million, underscoring why Debian-based migration is being pursued for this portion of the fleet.