gVisor vs Podman

gVisor is a free, open-source Linux-compatible sandbox and application kernel for running containers while isolating the host from untrusted code. It is intended for workloads such as user-uploaded, LLM-generated, and third-party code. Instead of passing sandboxed applications’ system calls directly to the host, its Sentry handles them; a Gofer process mediates filesystem access. The project describes a least-privilege design with a restrictive system call filter. It documents use with Docker, Kubernetes, containerd, and OCI runtimes, including Kubernetes configurations using GKE Sandbox, Minikube, or containerd with the gVisor shim. gVisor can stream application trace points to an external threat detection engine such as Falco, and can checkpoint and restore containers. Most CUDA applications can run unmodified in the sandbox with selected NVIDIA driver versions, but GPU support is restricted to certain models, drivers, capabilities, device files, ioctl calls, and platforms. Installation requires Linux 5.6 or later on x86_64 or ARM64. Compatibility is best-effort, and some applications may not work because not every system call, /proc file, or /sys file is implemented. Hardware side-channel protection is generally not provided.

Podman manages containers, pods, and images, with workflows for finding, running, building, and sharing container workloads. It is a free, daemonless container engine with a command line comparable to Docker’s CLI; most commands can run as a regular user without additional privileges. Podman Desktop adds a graphical application for installing and working with Podman and other container engines on Windows, macOS, and Linux. It can build images from Dockerfiles or Containerfiles, pull images from remote repositories, and manage accounts for pushing images to registries. Podman can run Kubernetes YAML locally, generate YAML from pods, and deploy to existing Kubernetes environments. It can find and pull containers from Docker Hub, Quay.io, internal registries, or vendors. On macOS and Windows it listens for Docker API clients. The project lists integrations including Visual Studio Code, Cirrus CLI, GitHub Actions, and kind. Podman is licensed under Apache License 2.0. Its security foundations include rootless and daemonless containers, SELinux support, network policy enforcement, and immutable containers.