It is a lightweight alternative to using Docker as the runtime for Kubernetes. Linux Containers aim to offer a vender neutral open-source container runtime.ĬRI-O is an implementation of the Kubernetes Container Runtime Interface (CRI) that allows the use of Open Container Initiative (OCI) compatible runtimes. Docker actually uses LXC behind the scenes. LXC is used to isolate operating, system-level processes from each other. The Linux Containers project is an open-source Linux container runtime system.

RKT containers aim to address the underlying cross contamination exploitive security issues that other container runtime systems suffer from. RKT containers do not allow insecure container functionality unless the user explicitly enables insecure features. Pronounced 'Rocket', RKT is a security-first focused container system. Containers on Docker Hub can instantly downloaded and deployed to a local Docker runtime. Docker Hub is a giant public repository of popular containerized software applications. Docker is the most popular and widely used container runtime.

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