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Docker Swarm

Container orchestration mode built into Docker Engine for running services across a cluster of hosts.

Open sourceSelf-hostableContainer orchestration platforms

Updated · AppBreakup editorial · Linux, Windows, Self-hosted

Visit Docker SwarmSee 5 alternatives

Is Docker Swarm free?

Yes, free and open source

License:
Apache-2.0 (SwarmKit)

Checked on Docker Swarm's site Nov 8, 2026

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About Docker Swarm

Docker Swarm, or swarm mode, is the clustering and orchestration layer that ships inside Docker Engine. You turn a group of machines running Docker into a swarm with a couple of commands, then deploy services and stacks that the managers keep at the replica count you asked for. It handles service discovery through built-in DNS, an overlay network across hosts, rolling updates, secrets and configs, and mutual TLS between nodes, with Raft consensus among manager nodes. The appeal is simplicity: if you already write Docker Compose files, a stack file is nearly the same, and there is no separate control plane to install. The trade-off is a much smaller ecosystem than Kubernetes, fewer managed cloud offerings and less third-party tooling, so most large teams have moved on while small teams and homelabs still use it. It is free and open source under the Apache 2.0 licence through the SwarmKit project, and runs mainly on Linux hosts.

Best for: Small teams and homelabs already on Docker Compose who want multi-host services without Kubernetes.

Pros and cons

What works

  • Built into Docker Engine, so there is nothing extra to install
  • Stack files are close to Docker Compose files
  • Mutual TLS between nodes and built-in secrets out of the box
  • Far simpler to learn and operate than Kubernetes

Why people leave

  • Much smaller ecosystem and community than Kubernetes
  • Few managed cloud services offer Swarm clusters
  • No built-in autoscaling of services based on load

Docker Swarm vs Kubernetes, K3s and HashiCorp Nomad

From each app's listing and the prices verified on its own site. A dash means we haven't verified it yet.

AttributeDocker SwarmKubernetesK3sHashiCorp Nomad
PricingOpen sourceOpen sourceOpen sourceFree plan + paid
Verified price————
Free planFree appFree appFree appYes
Open sourceYesYesYesNo
Self-hostableYesYesYesYes
PlatformsLinux, Windows, Self-hostedLinux, Self-hostedLinux, Self-hostedLinux, Windows, macOS, Self-hosted

Top Docker Swarm alternatives

See all 5
  1. 1Kubernetes logo
    Kubernetes

    The industry-standard orchestrator with autoscaling and a huge ecosystem, worth the extra complexity at scale.

    68.8
  2. 2K3s logo
    K3s

    Lightweight Kubernetes in one small binary, a step up from Swarm that still runs on small servers and edge devices.

    64.8
  3. 3HashiCorp Nomad logo
    HashiCorp Nomad

    Simple single-binary scheduler that runs containers and non-container jobs, close to Swarm's ease of setup.

    61.8
  4. 4MicroK8s logo
    MicroK8s

    Low-ops Kubernetes from Canonical with one-command add-ons, easy for small clusters and developer machines.

    59.4
  5. 5Red Hat OpenShift logo
    Red Hat OpenShift

    Enterprise Kubernetes with built-in CI/CD, security policies and vendor support for regulated companies.

    57.5

Why people left Docker Swarm

In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.

No switching stories yet. If you moved away from Docker Swarm, review the app you switched to and tell us why.

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Docker Swarm: common questions

What is Docker Swarm?

Docker Swarm: Container orchestration mode built into Docker Engine for running services across a cluster of hosts. Best for small teams and homelabs already on Docker Compose who want multi-host services without Kubernetes. Available for Linux and Windows, and you can host it yourself.

Is Docker Swarm free?

Yes. Docker Swarm is free, open-source software that you can host yourself.

Is Docker Swarm open source?

Yes. The source code is on GitHub at moby/swarmkit. You can also run it on your own server.

What platforms does Docker Swarm run on?

Docker Swarm is available for Linux, Windows and Self-hosted.

What are the best alternatives to Docker Swarm?

The highest-ranked Docker Swarm alternatives right now are Kubernetes, K3s and HashiCorp Nomad. See the full ranked list for pricing, platforms and verified facts.

Docker Swarm vs Kubernetes: what's the difference?

Both Docker Swarm and Kubernetes are free and open source. Only Docker Swarm runs on Windows.

See all 5 Docker Swarm alternatives