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# nixos-servers
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Nix definitions to configure our server.
Currently, our three main machines and all virtual machines run NixOS!
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## Acknowledgements
- [deploy-rs ](https://github.com/serokell/deploy-rs ): NixOS deploy tool with rollback functionality
- [disko ](https://github.com/nix-community/disko ): declarative disk partitioning
- [agenix ](https://github.com/ryantm/agenix ): deployment of encrypted secrets to NixOS machines
- [dns.nix ](https://github.com/kirelagin/dns.nix ): A Nix DSL for defining DNS zones
- [microvm.nix ](https://github.com/astro/microvm.nix ): Declarative virtual machine management in NixOS
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## Installation
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### Prerequisites
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1. Install the Nix package manager or NixOS ([link](https://nixos.org/download))
2. Enable flake and nix commands ([link](https://nixos.wiki/wiki/Flakes#Enable_flakes_permanently_in_NixOS))
3. Install Direnv ([link](https://direnv.net/))
4. Allow direnv for this repository: `direnv allow`
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### Bootstrapping
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We bootstrap our physical server using [nixos-anywhere ](https://github.com/nix-community/nixos-anywhere ).
This reformats the hard disk of the server and installs a fresh NixOS.
Additionally, it deploys an age identity, which is later used for decrypting secrets.
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⚠️ This will wipe your server completely ⚠️
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1. Make sure your have a [Secret service ](https://www.gnu.org/software/emacs/manual/html_node/auth/Secret-Service-API.html ) running (such as Keepassxc) that provides the age identity.
2. Ensure you have root SSH access to the server.
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3. Run nixos-anywhere: `./bootstrap.sh <servername> <hostname>`
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### Deployment
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To deploy all servers at once: `deploy -k`
To deploy only one server: `deploy -k --targets .#<host>`
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## Known bugs
When deploying a new virtiofs share, the error `Failed to connect to '<name>.sock': No such file or directory` can occur.
This seems to be a bug in `microvm.nix` and I opened a bug report [here ](https://github.com/astro/microvm.nix/issues/200 ).
A workaround is to deploy the share without `deploy-rs` 's rollback feature enabled:
```
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deploy -k --targets .#lewis --auto-rollback false --magic-rollback false
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```
