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By Zayden R., August 11, 2026
Fedora CoreOS 45 will enable systemd-oomd and zRAM swap by default, aligning with other Fedora variants. This change, approved by FESCo, addresses Kubernetes compatibility with swap and enhances system resource management.
Fedora CoreOS, the container-optimized operating system, is set to enable systemd-oomd and zRAM swap by default starting with its 45th release. This move, approved by the Fedora Engineering and Steering Committee (FESCo), aligns CoreOS with other Fedora variants that have already adopted these features. Engineers and sysadmins should take note, as these changes could significantly impact system performance and resource management.
The decision to enable systemd-oomd, a userspace out-of-memory (OOM) killer, is a strategic one. This tool helps manage system resources more effectively by terminating less critical processes when memory is low, thereby preventing system freezes. It’s a solid improvement for anyone running resource-intensive applications in a containerized environment.
Additionally, zRAM swap will now be a default feature. zRAM is a compressed block device in RAM that acts as swap space, offering better performance than traditional swap on disk. This is particularly beneficial for systems with limited physical memory, as it reduces I/O overhead and boosts overall responsiveness.
Fedora CoreOS had previously held off on enabling swap due to compatibility issues with Kubernetes, which did not support swap on nodes until recently. With these issues now resolved, CoreOS is ready to make the shift, providing users with improved memory handling capabilities.
This change is detailed in the Fedora Wiki and has been unanimously approved by FESCo. It’s a testament to the community’s commitment to keeping Fedora CoreOS at the forefront of container-optimized operating systems. Engineers managing Fedora CoreOS systems should prepare to see these features in action with the upcoming F45 release, and consider how these enhancements can be leveraged in their own deployments.
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