From the simple question “What is a container, really?” I began building the Rust-based container runtime youki and watched it grow. This talk walks through container runtime fundamentals, a quick hands-on of crafting a tiny runtime, and what makes youki unique—rootless support, cgroup v2, and how the community has been developing it. https://event.ospn.jp/odc2021-online/session/405951 https://github.com/containers/youki