Seven Alternatives to Docker: Podman, LXD, containerd, Buildah, BuildKit, Kaniko, and RunC

Many enterprises use containers to develop and manage stable applications, with Docker being the most feature‑rich and widely adopted tool, but several alternatives exist that offer unique use cases and capabilities.

01 Podman

Podman is a daemon‑less, open‑source Linux native container engine developed by Red Hat that builds, runs, and manages OCI containers and images. Unlike Docker, it does not rely on a persistent daemon; containers run as child processes and can operate without root privileges, providing an extra security layer. Podman also supports pods—groups of containers managed as a single entity—facilitating migration to Kubernetes.

02 LXD

LXD is an open‑source container engine built for LXC Linux containers. It adds a daemon to handle networking, storage, and management of multiple LXC containers, offering features beyond the basic LXC toolset. Unlike Docker’s single‑process‑per‑container model, LXC/LXD containers can run multiple processes, but Docker remains more portable and supports Windows and macOS, whereas LXD is Linux‑only.

03 containerd

containerd is a high‑level container runtime that uses runc underneath to provide an interface between the OS and container engine. It abstracts OS‑specific functions, simplifying container portability, but unlike Docker it does not handle image building or volume creation. Originally Docker’s default runtime, containerd now operates as an independent tool and is widely used in Kubernetes environments.

04 Buildah

Buildah, from the Red Hat Foundation, is an OCI image‑building tool that offers functionality similar to docker build . It can build images from Dockerfiles or Containerfiles, provides fine‑grained layer control, and can create images from scratch. Buildah works closely with Podman, which uses a subset of Buildah’s capabilities for its build process.

05 BuildKit

BuildKit is the second‑generation image‑building project from Moby, available as an experimental feature in newer Docker versions. It runs as a daemon like standard Docker builds but enables parallel build processing, stage skipping, incremental builds, rootless builds, and caching to improve performance.

06 Kaniko

Kaniko is a Google‑maintained image‑building tool that constructs images from Dockerfiles without requiring a daemon, focusing on building within Kubernetes clusters. While convenient for CI/CD pipelines in Kubernetes, it is less suited for local development.

07 RunC

RunC originated as a Docker component and was released as a standalone, standardized container runtime in 2015. It is widely used by DevOps teams as part of Docker or other custom container engines, handling the low‑level execution of containers.

Original source: https://www.containiq.com/post/docker-alternatives