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The project provides an open container runtime specification and standardized schema for defining container configurations, namespaces, resource limits, security policies, and filesystem mounts across platforms. It outlines the formal configuration formats, lifecycle operations, and execution environments necessary for portable, isolated container workloads. The specification covers container lifecycle management protocols and structured rules governing container creation, execution startup, process signaling, state tracking, and resource teardown. It standardizes local bundle packaging and

RootlessKit is a tool for running container workloads and isolated process trees securely as a standard non-privileged user without holding root access on the host. It creates unprivileged user and mount namespaces to simulate fake root execution environments, allowing users to execute container workloads and manage resource groups safely. The project provides capabilities for rootless port forwarding and unprivileged network namespace isolation, routing container network traffic through user-mode packet translation without requiring privileged kernel setup. It includes multiple backend netwo