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azukaar/Cosmos-Server

Self-hosted home server platform acting as a secure reverse proxy, app manager, and gateway with auth, MFA, SSO, and anti-bot protection.

Open-source alternative to:Cloudflare AccessUnraid

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What is it?

Cosmos Server is a self-hosted home server platform that sits in front of your applications as a secure gateway and also works as a server manager. It is aimed at people running services such as Plex, Home Assistant or a blog on a server, NAS or Raspberry Pi, and it focuses on protecting those services against unauthorized access and abusive traffic.

The project bundles several tools into one web UI: a reverse proxy with automatic HTTPS via Let's Encrypt, an authentication server with multi-factor authentication and OpenID, a container manager that supports docker-compose, an app store, storage and disk management, backups based on Restic, and monitoring with alerts. It also includes a VPN, and a SmartShield module that applies rate limiting, throttling and bans, with anti-bot and anti-DDOS measures.

Cosmos can run any Docker container, not only apps installed through its own store, and it can be used without some of its modules, such as Docker or HTTPS. It provides a JavaScript SDK, a Go SDK and a Terraform provider for automation.

Key features

  • 01Reverse proxy with automatic HTTPS and wildcard certificates via DNS challenge.
  • 02Authentication server with multi-factor authentication and OpenID, forward-header and HTML strategies.
  • 03Container manager with docker-compose support and security auditing.
  • 04SmartShield rate limiting, user bans and anti-bot and anti-DDOS protection.
  • 05Built-in VPN, incremental encrypted backups with Restic, and real-time monitoring with alerts.
  • 06Storage management and network storage via RClone, plus SDKs and a Terraform provider.

Use cases

  • Putting a secure HTTPS front door in front of Plex, Home Assistant or other self-hosted apps.
  • Giving family members or friends single sign-on access to several home services.
  • Managing Docker containers and their updates on a home NAS or Raspberry Pi.
  • Accessing home services remotely through the built-in VPN without opening router ports.

Things to know

  • The license is not clearly identified in the metadata, so check the repository's license terms before use.
  • It is a broad self-hosted platform with many bundled components, so setup and ongoing management take real effort.

Topics

#self-hosted#reverse-proxy#authentication#security#docker#homelab#backup#vpn#cloud#cosmos

FAQ

What is Cosmos-Server?
Self-hosted home server platform acting as a secure reverse proxy, app manager, and gateway with auth, MFA, SSO, and anti-bot protection. Cosmos Server is a self-hosted home server platform that sits in front of your applications as a secure gateway and also works as a server manager. It is aimed at people running services such as Plex, Home Assistant or a blog on a server, NAS or Raspberry Pi, and it focuses on protecting those services against unauthorized access and abusive traffic.
Is Cosmos-Server free to use? What license does it have?
Cosmos-Server is open source under the Other license. Check the license terms before using it in commercial products.
Is Cosmos-Server still maintained?
Actively maintained. The last commit to Cosmos-Server was on Oct 9, 2026.
What can I use Cosmos-Server for?
Putting a secure HTTPS front door in front of Plex, Home Assistant or other self-hosted apps. Giving family members or friends single sign-on access to several home services. Managing Docker containers and their updates on a home NAS or Raspberry Pi. Accessing home services remotely through the built-in VPN without opening router ports.
Where can I get Cosmos-Server?
The source code and installation instructions are on GitHub: https://github.com/azukaar/Cosmos-Server

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