Docker Swarm vs. Kubernetes: Battle of the container orchestration platforms

Containers are the crux of every self-hosted workstation, and for good reason. Thanks to their lightweight nature, you can deploy dozens of containerized services on low-power devices like the Raspberry Pi. Plus, you can set up hardcore container orchestration platforms to boost the functionality of your home server.

Speaking of, Docker Swarm and Kubernetes are the most popular container orchestration platforms in the home lab ecosystem. If you’re wondering which of the two would be the better option for your setup, then read on! We’ve pitted the two platforms against each other to see which one comes out on top.

Accessibility and ease of setup

Winner: Docker Swarm

If you’re looking for a quick and easy way to deploy a high-availability containerization environment, you won’t be disappointed with Docker Swarm. As long as you’re even remotely familiar with Docker Engine and have it installed on a couple of systems, you can run a handful of commands to configure the manager and worker nodes. It’s also far easier to pick up, as you’ll have to modify a few keywords in your Docker commands to run services inside a Swarm cluster.

Kubernetes, on the other hand, has a significantly higher learning curve. Setting it up is also rather challenging, regardless of whether you go with MicroK8s, K3s, or other Kubernetes distributions. While Podman users may have a slightly easier time getting accustomed to the pod-based structure of Kubernetes, you might need to go through several pages of documentation if you’ve been using Docker as your sole container management platform. Speaking of…

Compatibility with container runtimes

Winner: K8s, and its array of Podman, Windows, and Docker containers

Docker may be the most popular container runtime environment, but it’s far from the only option. On the non-production front alone, you’ve got the open-source Podman, the barebones Containerd, and even Windows containers. As you may have guessed from the name, Docker Swarm is only compatible with Docker containers, so you’re out of luck if your self-hosted lab includes services deployed with different runtime environments.

Thankfully, Kubernetes supports a ton of container runtimes, including Docker, Containerd, and Podman. Heck, if your workloads involve Windows containers, you can also pair them with your Kubernetes cluster!

Management UI

Winner: Kubernetes, but a draw with Portainer

Terminal commands are undoubtedly the best way to manage your containers, pods, and stacks. But if you’re not a fan of CLI-based management setups, Kubernetes lets you leverage a robust web-based Dashboard in your containerization tasks. Besides offering a beginner-friendly method to monitor, log, and deploy your favorite services, it’s also surprisingly easy to configure.

On its own, Docker Swarm only has a command line interface and lacks a menu-based web UI. But you can deploy a Portainer server inside a manager node to level the playing field.

Auto-scaling

Winner: Kubernetes

Although automatic scaling typically comes into play inside professional environments, it’s still a neat feature for hardcore home labs. For the uninitiated, auto-scaling lets your manager/master node dynamically activate (or deactivate) other nodes in accordance with the processing demand.

As you’d expect from a production-tier tool of its caliber, Kubernetes includes automatic scaling provisions. Meanwhile, Docker Swarm also lets you alter the number of active nodes in response to resource requests, though you’re limited to manual scaling.

Community support and additional utilities

Winner: Kubernetes

Considering that Kubernetes is extremely popular in production environments, it shouldn’t come as a surprise that it’s compatible with a host of first and third-party utilities. You’ve got Ansible and Terraform for automation, numerous Helm charts to simplify container deployment, Stern for log tailing, and several CI/CD tools.

While I wouldn’t go so far as to say that the Docker Swarm ecosystem is dead, it’s nowhere near as thriving as its rival. Not only does it have a smaller user base than Kubernetes, but you also won’t find as many specialized tools designed for Docker as you would for Kubernetes.

Docker Swarm vs. Kubernetes: So, which one’s better for your containers?

Swarm for simple home labs, Kubernetes for everything else

With its robust features, thriving community, and a plethora of tools, it’s no surprise that Kubernetes wins this round by a landslide. For hardcore home labbers who love tinkering with containers, you’ll be equally impressed and annoyed by Kubernetes. But if you’re willing to set aside some time for K8s, you can put together a powerful self-hosting war machine. Plus, it’s a great way to get your feet wet with container orchestration if you’re pursuing a career in the DevOps or sysadmin fields.

That said, Kubernetes may be overkill for the average user who wants to set up a simple cluster for their locally hosted services. In that case, Docker Swarm is the better alternative, as you don’t have to spend hours getting used to a complicated production-tier utility. And once Docker Swarm can no longer meet your containerization needs, you can just migrate to Kubernetes using the Kompose utility.

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