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docker-archive/classicswarm

★ 5,734GoAudience · developerComplexity · 2/5LicenseSetup · hard

TLDR

Classic Swarm was Docker's original tool for managing multiple servers as one, letting you run containers across a pool of machines with a single Docker command. It is now archived and replaced by Docker's built-in Swarm mode.

Mindmap

mindmap
  root((repo))
    What It Does
      Manage server groups
      Single control point
      Route containers
    History
      Started 2014
      First orchestration
      Now archived
    Replaced By
      Docker Swarm mode
      Swarmkit built-in
      Other orchestrators
    Tech
      Written in Go
      Apache 2.0 license
    Limitations
      No auto restart
      No load balancing
      No service discovery
    Status
      Archived
      Not maintained
      Historical only
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Things people build with this

USE CASE 1

Study how early container orchestration worked before Kubernetes and modern Docker Swarm became standard

USE CASE 2

Understand Docker's architectural history when researching container technology evolution

USE CASE 3

Reference legacy Classic Swarm configs when migrating old infrastructure to Docker Swarm mode or Kubernetes

Tech stack

GoDockerApache 2.0

Getting it running

Difficulty · hard Time to first run · 1day+

This project is archived and unmaintained. Do not use for new projects. For historical study only, no active community or support exists.

Apache 2.0, free to use, modify, and distribute. Just keep the license notice. No patent traps.

In plain English

Classic Swarm was Docker's first tool for managing a group of servers running Docker containers as if they were a single machine. Instead of connecting to each server separately, you would point your Docker commands at Swarm, and it would figure out which server in the pool to run each container on. The project started in 2014 and was Docker's earliest attempt at what is called container orchestration, meaning coordinating workloads across multiple machines. This repository is archived and no longer maintained. Docker built a newer, more capable version of this functionality directly into the Docker Engine itself, called Swarm mode (sometimes referred to as Swarmkit). The newer built-in version handles things like automatic restarts, load balancing, and service discovery, which Classic Swarm did not support. Anyone still looking at this project is directed to use Docker's built-in Swarm mode or a different orchestration system entirely. The README is short because the project is no longer active. The code is written in Go and was released under the Apache 2.0 license. It represents a historical step in how Docker evolved before more sophisticated orchestration tools became standard.

Copy-paste prompts

Prompt 1
I have an old docker-archive/classicswarm setup. Help me migrate it to Docker's built-in Swarm mode, what are the key differences and how do I rewrite my Compose or Swarm config?
Prompt 2
Explain how Classic Swarm scheduled containers across a cluster of Docker hosts. What algorithm did it use and how does that compare to how Docker Swarm mode works today?
Prompt 3
I'm reading the docker-archive/classicswarm source code in Go. Walk me through how a Docker client command gets routed to a specific node in the cluster.
Prompt 4
What features does modern Docker Swarm mode have that Classic Swarm lacked? Give me a side-by-side comparison I can share with my team.
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