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Update readme and glossary to reflect features and goals

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README.md
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![ci](https://github.com/juanfont/headscale/actions/workflows/test.yml/badge.svg) ![ci](https://github.com/juanfont/headscale/actions/workflows/test.yml/badge.svg)
An open source, self-hosted implementation of the Tailscale coordination server. An open source, self-hosted implementation of the Tailscale control server.
Join our [Discord](https://discord.gg/XcQxk2VHjx) server for a chat. Join our [Discord](https://discord.gg/XcQxk2VHjx) server for a chat.
**Note:** Always select the same GitHub tag as the released version you use to ensure you have the correct example configuration and documentation. The `main` branch might contain unreleased changes. **Note:** Always select the same GitHub tag as the released version you use
to ensure you have the correct example configuration and documentation.
The `main` branch might contain unreleased changes.
## Overview ## What is Tailscale
Tailscale is [a modern VPN](https://tailscale.com/) built on top of [Wireguard](https://www.wireguard.com/). It [works like an overlay network](https://tailscale.com/blog/how-tailscale-works/) between the computers of your networks - using [NAT traversal](https://tailscale.com/blog/how-nat-traversal-works/). Tailscale is [a modern VPN](https://tailscale.com/) built on top of
[Wireguard](https://www.wireguard.com/).
It [works like an overlay network](https://tailscale.com/blog/how-tailscale-works/)
between the computers of your networks - using
[NAT traversal](https://tailscale.com/blog/how-nat-traversal-works/).
Everything in Tailscale is Open Source, except the GUI clients for proprietary OS (Windows and macOS/iOS), and the 'coordination/control server'. Everything in Tailscale is Open Source, except the GUI clients for proprietary OS
(Windows and macOS/iOS), and the control server.
The control server works as an exchange point of Wireguard public keys for the nodes in the Tailscale network. It also assigns the IP addresses of the clients, creates the boundaries between each user, enables sharing machines between users, and exposes the advertised routes of your nodes. The control server works as an exchange point of Wireguard public keys for the
nodes in the Tailscale network. It assigns the IP addresses of the clients,
creates the boundaries between each user, enables sharing machines between users,
and exposes the advertised routes of your nodes.
headscale implements this coordination server. A [Tailscale network (tailnet)](https://tailscale.com/kb/1136/tailnet/) is private
network which Tailscale assigns to a user in terms of private users or an
organisations.
## Design goal
`headscale` aims to implement a self-hosted, open source alternative to the Tailscale
control server. `headscale` has a narrower scope and an instance of `headscale`
implements a _single_ Tailnet, which is typically what a single organisation, or
home/personal setup would use.
`headscale` uses terms that maps to Tailscale's control server, consult the
[glossary](./docs/glossary.md) for explainations.
## Support ## Support
If you like `headscale` and find it useful, there is sponsorship and donation buttons available in the repo. If you like `headscale` and find it useful, there is a sponsorship and donation
buttons available in the repo.
If you would like to sponsor features, bugs or prioritisation, reach out to one of the maintainers. If you would like to sponsor features, bugs or prioritisation, reach out to
one of the maintainers.
## Status ## Features
- [x] Base functionality (nodes can communicate with each other) - Full "base" support of Tailscale's features
- [x] Node registration through the web flow - Configurable DNS
- [x] Network changes are relayed to the nodes - [Split DNS](https://tailscale.com/kb/1054/dns/#using-dns-settings-in-the-admin-console)
- [x] Namespaces support (~tailnets in Tailscale.com naming) - Node registration
- [x] Routing (advertise & accept, including exit nodes) - Single-Sign-On (via Open ID Connect)
- [x] Node registration via pre-auth keys (including reusable keys, and ephemeral node support) - Pre authenticated key
- [x] JSON-formatted output - Taildrop (File Sharing)
- [x] ACLs - [Access control lists](https://tailscale.com/kb/1018/acls/)
- [x] Taildrop (File Sharing) - [MagicDNS](https://tailscale.com/kb/1081/magicdns)
- [x] Support for alternative IP ranges in the tailnets (default Tailscale's 100.64.0.0/10) - Support for multiple IP ranges in the tailnet
- [x] DNS (passing DNS servers to nodes) - Dual stack (IPv4 and IPv6)
- [x] Single-Sign-On (via Open ID Connect) - Routing advertising (including exit nodes)
- [x] Share nodes between namespaces - Ephemeral nodes
- [x] MagicDNS (see `docs/`)
## Client OS support ## Client OS support
@ -53,10 +76,6 @@ If you would like to sponsor features, bugs or prioritisation, reach out to one
| Android | [You need to compile the client yourself](https://github.com/juanfont/headscale/issues/58#issuecomment-885255270) | | Android | [You need to compile the client yourself](https://github.com/juanfont/headscale/issues/58#issuecomment-885255270) |
| iOS | Not yet | | iOS | Not yet |
## Roadmap
Suggestions/PRs welcomed!
## Running headscale ## Running headscale
Please have a look at the documentation under [`docs/`](docs/). Please have a look at the documentation under [`docs/`](docs/).
@ -68,11 +87,15 @@ Please have a look at the documentation under [`docs/`](docs/).
## Contributing ## Contributing
To contribute to Headscale you would need the lastest version of [Go](https://golang.org) and [Buf](https://buf.build)(Protobuf generator). To contribute to headscale you would need the lastest version of [Go](https://golang.org)
and [Buf](https://buf.build)(Protobuf generator).
PRs and suggestions are welcome.
### Code style ### Code style
To ensure we have some consistency with a growing number of contributions, this project has adopted linting and style/formatting rules: To ensure we have some consistency with a growing number of contributions,
this project has adopted linting and style/formatting rules:
The **Go** code is linted with [`golangci-lint`](https://golangci-lint.run) and The **Go** code is linted with [`golangci-lint`](https://golangci-lint.run) and
formatted with [`golines`](https://github.com/segmentio/golines) (width 88) and formatted with [`golines`](https://github.com/segmentio/golines) (width 88) and
@ -99,7 +122,8 @@ make install-protobuf-plugins
### Testing and building ### Testing and building
Some parts of the project require the generation of Go code from Protobuf (if changes are made in `proto/`) and it must be (re-)generated with: Some parts of the project require the generation of Go code from Protobuf
(if changes are made in `proto/`) and it must be (re-)generated with:
```shell ```shell
make generate make generate

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docs/glossary.md
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# Glossary # Glossary
- Namespace: Collection of Tailscale nodes that can see each other. In Tailscale.com this is called Tailnet. | Term | Description |
| --------- | --------------------------------------------------------------------------------------------------------------------- |
| Machine | A machine is a single entity connected to `headscale`, typically an installation of Tailscale. Also known as **Node** |
| Namespace | A namespace is a logical grouping of machines "owned" by the same entity, in Tailscale, this is typically a User |