# What are the 5 best alternatives to Docker? Containerisation with [Docker](https://www.ionos.co.uk/digitalguide/server/know-how/what-is-docker/) is the standard today – but it’s not always the best option for every situation. Tools like **Podman** or **BuildKit** offer strong alternatives, providing benefits in areas such as security, CI/CD and performance. In this article, we’ll explore the **best professional Docker alternatives**, compare their key features, and help you determine which solution is best for your specific use case. ## Comparing Docker alternatives at a glance
Feature Docker Podman BuildKit Kaniko LXC/LXD runC
Virtualisation OS-Level OS-Level – (Build Tool) – (Build Tool) OS-Level OS-Level
App Containers ~
Full-System Containers
Docker-compatible ~ ~
Rootless possible ~ ~
Suitable for CI/CD ~
Kubernetes-ready ~ ~
Container Format [Docker-Container](https://www.ionos.co.uk/digitalguide/server/know-how/docker-container/) Docker-Container Dockerfile Layered FS LXC OCI
License Apache 2.0 Apache 2.0 Apache 2.0 Apache 2.0 LGPLv2.1+ / Apache 2.0 Apache 2.0
Platforms Linux, Windows, macOS, AWS, Azure Linux, Windows Linux, Windows Linux, Kubernetes Linux Linux
Tip Want to learn more about Docker? Check out our separate [Docker Tutorial](https://www.ionos.co.uk/digitalguide/server/configuration/docker-tutorial-installation-and-first-steps/). ## Why consider Docker alternatives? While Docker is a powerful tool, it’s not always the best option. Changes to Docker’s licensing, such as the commercialisation of Docker Desktop, have affected many businesses. At the same time, Docker’s reliance on root access and its use of a central daemon can increase the potential attack surface, raising security concerns. What’s more, Kubernetes, the leading container orchestration tool, has moved away from Docker as its default runtime. Instead, it now uses runtimes like containerd or CRI-O. For many use cases –especially in security-sensitive environments or automated CI/CD processes – specialised tools may offer better solutions. ## Podman – Docker without a daemon **Podman** is currently the most well-known and direct alternative to Docker. What makes it particularly interesting is that [Podman](https://www.ionos.co.uk/digitalguide/server/tools/podman-tutorial/) operates **without a central daemon**, allowing you to start container processes directly and, if needed, without requiring **root access**. This significantly enhances security, especially in production environments. [![Image: Podman Homepage](https://www.ionos.co.uk/digitalguide/fileadmin/_processed_/9/3/csm_podman-docker-alternative_3ded90a1cb.webp "Podman Homepage")](https://www.ionos.co.uk/digitalguide/fileadmin/DigitalGuide/Screenshots_2025/podman-docker-alternative.png) Podman Website Screenshot Another advantage is **high compatibility**: If you’re already familiar with Docker, you’ll have no trouble with Podman, as its command structure is nearly identical. It also integrates seamlessly with systemd and Kubernetes. However, there is a downside: Graphical User Interfaces (GUIs) or [GUI tools](https://www.ionos.co.uk/digitalguide/websites/web-design/graphical-user-interface-a-successful-ui/) for Podman are not as advanced as those for Docker Desktop. Also, for more complex multi-container projects, switching from [Docker Compose](https://www.ionos.co.uk/digitalguide/server/configuration/docker-compose-tutorial/) may require some modifications. **Conclusion:** Podman is ideal for developers and administrators looking for a secure, command-line-based and Docker-compatible alternative – especially in production Linux environments. ## BuildKit – The modern Docker builder **BuildKit** was developed by the Docker team to replace the classic ‘docker build’ command. It stands out due to its **superior speed**, **intelligent** [caching](https://www.ionos.co.uk/digitalguide/hosting/technical-matters/what-is-caching/), and the ability to manage **build secrets**, which is a huge benefit in complex CI/CD pipelines. Parallel builds are also supported, making BuildKit particularly efficient. It can be enabled within Docker or used **standalone**. When combined with Docker or Podman, it dramatically boosts image building performance. The downside, however, is that BuildKit **does not replace Docker entirely**. It’s focused solely on the build process. Anyone wishing to manage or deploy containers will need an additional tool. **Conclusion:** BuildKit is perfect for DevOps teams and developers who prioritise fast, secure builds – especially in automated environments. ## Kaniko – Container builds without Docker **Kaniko** is a tool from Google specifically designed for **building containers in Kubernetes environments** – without Docker or root access. It runs entirely within a pod and can build images directly in the cloud, such as in [GitHub Actions](https://www.ionos.co.uk/digitalguide/websites/web-development/github-actions/) or Google Cloud Build. This makes Kaniko ideal for automated CI/CD processes, where no additional runtime environment should be installed. An important advantage when it comes to security is that Kaniko runs without root access, meaning it can be used safely in shared cluster environments. However, Kaniko is not a universal tool. It is **not suitable for local development** or interactive work in the command line – common features such as shell access or flexible container management are missing. **Conclusion:** Kaniko is perfect for teams working in cloud-native environments who want to securely automate containerised build processes – especially in Kubernetes environments. ## LXC / LXD – System-level containerisation LXC (Linux Containers) is a low-level technology for **operating system virtualisation under Linux**, which has been around for over a decade. It allows you to run and manage complete Linux systems in containers – commonly referred to as system containers. [![Image: LXC Homepage](https://www.ionos.co.uk/digitalguide/fileadmin/_processed_/d/1/csm_linuxcontainers-org_195483d9b0.webp "LXC Homepage")](https://www.ionos.co.uk/digitalguide/fileadmin/DigitalGuide/Screenshots/linuxcontainers-org.png) LXC Homepage Screenshot LXD, developed by Canonical in 2015, provides a user-friendly management layer over LXC. It adds features like its own CLI, a REST API, image management and snapshots, making it especially useful in professional infrastructures. ### LXC and LXD – Why they came back together In 2023, Canonical **returned LXD to the LXC community**, and since then, both projects have been **developed together under the Linux Containers Project**. The goal of this merger is to ensure more transparent community-driven maintenance and a closer integration of both components. While LXC remains the technical foundation, LXD continues to serve as a user-friendly front end. The functional division remains: - **LXC** serves as the low-level technology - **LXD** remains the comfortable management front end ### Technical classification Compared to Docker, LXC and LXD are **much closer to traditional virtual machines**. They provide full system environments with init systems, user management, package management and more – far beyond the typical applications containers offered by Docker or Podman. However, by not using a hypervisor, they still manage to remain lightweight and performant. ### Limitations The downside is that LXC/LXD is not optimised for microservices, [cloud-native](https://www.ionos.co.uk/digitalguide/websites/web-development/what-is-cloud-native/) deployments, or modern CI/CD processes. The management can be more complex, and integration into container ecosystems like Kubernetes is minimal. **Conclusion:** LXC and LXD are excellent for admins, hosting providers or teams that want to isolate full Linux systems – acting as a lightweight VM alternative. The merger under the Linux Containers Project promises a more stable, community-maintained future for both technologies. ## runC – The container runtime for advanced users **runC** is the reference implementation of the **OCI Specification** (Open Container Initiative) and is used behind the scenes by many tools – such as Docker, Podman, or containerd. Anyone who wants to manage containers at the lowest level will likely need to use runC. Its biggest advantage is its **lightweight** nature, since runC provides only the basics required to start containers, making it highly flexible. It is ideal for custom container solutions or security-focused environments. However, runC is aimed at advanced users. It lacks a convenient CLI for container management or building and is typically used as part of custom toolchains or for deep system integration. **Conclusion:** runC is perfect for specialised applications, research, security or low-level container environments – it is not intended for everyday development. ## Kubernetes – Not a Docker alternative, but a layer above A common misconception is that **Kubernetes does not replace Docker**. Instead, it **relies on container runtimes** to run containers. While Docker was once the default runtime, Kubernetes has since adopted standardised runtimes like **containerd** or [CRI-O](https://www.ionos.co.uk/digitalguide/server/know-how/what-is-cri-o/) since version 1.20. [![Image: Kubernetes Homepage](https://www.ionos.co.uk/digitalguide/fileadmin/_processed_/0/a/csm_kubernetes-docker-alternative_f8d4a690e2.webp "Kubernetes Homepage")](https://www.ionos.co.uk/digitalguide/fileadmin/DigitalGuide/Screenshots_2025/kubernetes-docker-alternative.png) Kubernetes Homepage Screenshot These tools handle container management, but do not have their own build or CLI functionality like Docker. Therefore, Kubernetes itself is not a Docker alternative, but an orchestration tool – a **control layer above the containers**. In practice, this means that anyone working with Kubernetes should understand that **Docker no longer serves as the technical foundation** – although many images still exist in the Docker format. ## Which Docker alternative is right for you? The right **Docker alternative** largely depends on your specific needs: - For maximum security, **Podman** is the best choice. - For high-performance builds, **BuildKit** stands out, while **Kaniko** is preferred in cloud environments. - For isolating entire systems, **LXC/LXD** is the better option. - For full control at the runtime level, **runC** is a lean solution for professionals. Ultimately, it’s worth looking beyond Docker – the world of containers is more diverse than ever before. This is a markdown version of: [https://www.ionos.co.uk/digitalguide/server/know-how/docker-alternatives-at-a-glance/](https://www.ionos.co.uk/digitalguide/server/know-how/docker-alternatives-at-a-glance/) for AI/LLM consumption.