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Learn about Image Mode (On-Cluster Layering), the officially supported method for extending Red Hat Enterprise Linux CoreOS (RHCOS) in OpenShift environments through this 16-minute conference talk from DevConf.IN 2026. Discover how this cloud-native approach to OS management treats the operating system like a container image, enabling you to define configurations as code, build unified OS images within the cluster, and deploy them across nodes with OpenShift's characteristic safety and consistency. Explore the architecture behind Image Mode, understand the MachineOSConfig workflow, and examine the in-cluster build process that makes customizations fully supported, upgrade-safe, and declarative without requiring external pipelines or custom OS builds. Gain insights into how Image Mode addresses the historical challenges of adding custom drivers, troubleshooting tools, monitoring agents, or hotfixes to the immutable RHCOS foundation while maintaining cluster stability and manageability. Understand the limitations and guidance around handling `/var` and other aspects of custom content addition, and see what the administrative experience looks like for both operators and customers implementing this modern approach to RHCOS customization.
