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Learn how to implement filesystem monitoring using fanotify within containerized environments in this conference talk from the Linux Foundation. Explore the evolution of fanotify from its filesystem monitoring capabilities introduced in kernel 5.1 to the HSM (Hierarchical Storage Management) features added in kernel 6.12. Discover two distinct strategies for enabling fanotify functionality inside containers: first, allowing userns administrators to monitor filesystems mounted within user namespaces or idmapped into userns, and second, enabling container users to subscribe to host-based services for receiving filesystem monitoring events scoped to their specific container. Gain insights into the technical challenges and solutions for bridging the gap between container isolation and filesystem monitoring requirements, with practical approaches for both user namespace-mounted filesystems and host-mounted filesystems accessed from within containers.
