Merge pull request 'add zerotier documentation' (#375) from Mic92-main into main

Reviewed-on: https://git.clan.lol/clan/clan-core/pulls/375
2023-09-29 15:38:44 +00:00
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+# ZeroTier Configuration with NixOS in Clan
+
+This guide provides detailed instructions for configuring
+[ZeroTier VPN](https://zerotier.com) within Clan. Follow the
+outlined steps to set up a machine as a VPN controller (`<CONTROLLER>`) and to
+include a new machine into the VPN.
+
+## 1. Setting Up the VPN Controller
+
+The VPN controller is initially essential for providing configuration to new
+peers. Post the address allocation, the controller's continuous operation is not
+crucial.
+
+### Instructions:
+
+1. **Designate a Machine**: Label a machine as the VPN controller in the clan,
+   referred to as `<CONTROLLER>` henceforth in this guide.
+2. **Add Configuration**: Input the below configuration to the NixOS
+   configuration of the controller machine:
+   ```nix
+   clan.networking.zerotier.controller = {
+     enable = true;
+     public = true;
+   };
+   ```
+3. **Update the Controller Machine**: Execute the following:
+   ```console
+   $ clan machines update <CONTROLLER>
+   ```
+   Your machine is now operational as the VPN controller.
+
+## 2. Integrating a New Machine to the VPN
+
+To introduce a new machine to the VPN, adhere to the following steps:
+
+### Instructions:
+
+1. **Update Configuration**: On the new machine, incorporate the below to its
+   configuration, substituting `<CONTROLLER>` with the controller machine name:
+   ```nix
+   { config, ... }: {
+     clan.networking.zerotier.networkId = builtins.readFile (config.clanCore.clanDir + "/machines/<CONTROLLER>/facts/zerotier-network-id");
+   }
+   ```
+2. **Update the New Machine**: Execute:
+   ```console
+   $ clan machines update <NEW_MACHINE>
+   ```
+   Replace `<NEW_MACHINE>` with the designated new machine name.
+3. **Retrieve the ZeroTier ID**: On the `new_machine`, execute:
+   ```console
+   $ sudo zerotier-cli info
+   ```
+   Example Output: `200 info d2c71971db 1.12.1 OFFLINE`, where `d2c71971db` is
+   the ZeroTier ID.
+4. **Authorize the New Machine on Controller**: On the controller machine,
+   execute:
+   ```console
+   $ sudo zerotier-members allow <ID>
+   ```
+   Substitute `<ID>` with the ZeroTier ID obtained previously.
+5. **Verify Connection**: On the `new_machine`, re-execute:
+   ```console
+   $ sudo zerotier-cli info
+   ```
+   The status should now be "ONLINE" e.g., `200 info 47303517ef 1.12.1 ONLINE`.
+
+Congratulations! The new machine is now part of the VPN, and the ZeroTier
+configuration on NixOS within the Clan project is complete.