Devconf.cz 2023

Serverless has been gaining popularity as a new way to program and deploy applications on clouds. Function as a service (FaaS) is an approach encompassed by serverless, extending the FaaS concept by avoiding server infrastructure management.
In this context, functions rely on containers, and deploying new containers can cause several overheads to the platforms and the function's execution (cold start delays).
Kubernetes-based platforms are used for serverless proposes, and K8S provides an ImageLocality mechanism to address it, but it relies on entire warm containers and not on layers.
Therefore, we propose and implement on K8S two new scheduling policies.The first is a ContainerLayer-Aware policy that optimizes function’s placements by selecting machines with the biggest rate of container layers that can be shared. The second is a Multi-Objective policy for heterogeneous platforms that reduces at the same time the makespan and the data transferred by functions I/O and container layers.