Container images are huge, duplicative, and a security headache. Lucas and Luna dig into Composefs — a new Linux filesystem layer developed by Red Hat's Alexander Larsson — that uses content-addressable storage to deduplicate image data across the entire host. They walk through how it works, why it slashes disk usage by up to 90 percent for common image stacks, and what it means for container runtime performance and image signing. With OCI image sizes ballooning and supply chain attacks on the rise, Composefs offers a kernel-level fix that's landing in Fedora 40 and beyond. This episode covers the technical meat without assuming you're a kernel developer.

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