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gomods/athens

★ 4,754GoAudience · ops devopsComplexity · 4/5Setup · moderate

TLDR

An open-source Go module proxy server that sits between your Go toolchain and the internet, caching dependencies in your own storage so builds keep working even when external package sources go down.

Mindmap

mindmap
  root((Athens))
    What it does
      Go module proxy
      Caches dependencies
    Why use it
      Offline build safety
      Upstream outage protection
      Controlled dep storage
    Storage backends
      Cloud blob storage
      MongoDB
      Local disk
      In-memory
    Audience
      Dev teams
      DevOps engineers
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Things people build with this

USE CASE 1

Run a private Go module proxy so team builds succeed even when external package sources are unavailable

USE CASE 2

Cache all Go dependencies centrally so a removed or renamed upstream package never breaks your builds

USE CASE 3

Set up Athens with existing cloud storage such as S3 or GCS to standardize dependency management across a team

USE CASE 4

Protect CI/CD pipelines from outages at pkg.go.dev or GitHub by serving modules from a local cache

Tech stack

Go

Getting it running

Difficulty · moderate Time to first run · 1h+

Requires configuring a storage backend and running Athens as a persistent service, teams also need to update their GOPROXY setting across all developer machines and CI environments.

In plain English

Athens is an open-source server that acts as a middle layer between Go developers and the public internet when they download code dependencies. When a Go project needs to pull in external packages, instead of fetching them directly from the original sources online, the developer's machine asks Athens first. Athens either serves the package from its own storage or fetches and saves it for next time. This kind of setup is useful for several reasons. Development teams inside companies often want to ensure builds do not depend on the availability of external websites. If a public package repository goes down or a package is removed, builds would still work because Athens has already cached everything locally. It also gives teams a single controlled point for dependency storage. Athens supports a wide range of storage options for where it keeps cached packages: cloud blob storage services, MongoDB, shared disk, in-memory storage, and content distribution networks. This flexibility lets teams slot Athens into whatever infrastructure they already have. The project implements the standard Go module download protocol, which means it works with the regular Go command-line tools without any special changes to how developers write their code or run their builds. Development teams at several companies are reportedly using Athens in their everyday workflows. Athens is open source and community-maintained. The project is looking for additional core maintainers. There is a Slack channel for the community, and the documentation at docs.gomods.io covers installation, configuration, and storage setup in more detail. The project follows the Contributor Covenant code of conduct.

Copy-paste prompts

Prompt 1
I want to set up Athens as a private Go module proxy for my team. What Docker command starts it and what GOPROXY environment variable do I set in my Go toolchain to point at it?
Prompt 2
Athens is returning a 404 for a module my project needs. How do I check what Athens has in storage and manually pre-populate a specific module version?
Prompt 3
Show me how to configure Athens to use an AWS S3 bucket as its backing storage instead of local disk.
Prompt 4
My company policy requires all Go builds to go through Athens with no direct internet access from CI. What GOPROXY, GONOSUMCHECK, and GOFLAGS settings do I need?
Prompt 5
How does Athens differ from using the public GOPROXY at proxy.golang.org, when would I self-host Athens instead of just pointing at the public proxy?
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