Containerd is a container supervisor that allows users to manage the lifecycle of a container as well as interact with the container while it is executing. Containerd was built to fulfill many of the requirements that we expect from a modern supervisor all while staying small and fast. In this talk, we will discuss some of the design decisions that shaped containerd’s architecture that allows it to reattach to running containers if it was killed and how it is designed to start 100s containers in seconds.