conduwuit-mirror/docs/deploying/nixos.md
strawberry 8dcdb4b09a
update some more docs
Signed-off-by: strawberry <strawberry@puppygock.gay>
2024-12-15 22:48:22 -05:00

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# conduwuit for NixOS
conduwuit can be acquired by Nix (or [Lix][lix]) from various places:
* The `flake.nix` at the root of the repo
* The `default.nix` at the root of the repo
* From conduwuit's binary cache
A community maintained NixOS package is available at [`conduwuit`](https://search.nixos.org/packages?channel=unstable&show=conduwuit&from=0&size=50&sort=relevance&type=packages&query=conduwuit)
### Binary cache
A binary cache for conduwuit that the CI/CD publishes to is available at the
following places (both are the same just different names):
```
https://attic.kennel.juneis.dog/conduit
conduit:eEKoUwlQGDdYmAI/Q/0slVlegqh/QmAvQd7HBSm21Wk=
https://attic.kennel.juneis.dog/conduwuit
conduwuit:BbycGUgTISsltcmH0qNjFR9dbrQNYgdIAcmViSGoVTE=
```
The binary caches were recreated some months ago due to attic issues. The old public
keys were:
```
conduit:Isq8FGyEC6FOXH6nD+BOeAA+bKp6X6UIbupSlGEPuOg=
conduwuit:lYPVh7o1hLu1idH4Xt2QHaRa49WRGSAqzcfFd94aOTw=
```
If needed, we have a binary cache on Cachix but it is only limited to 5GB:
```
https://conduwuit.cachix.org
conduwuit.cachix.org-1:MFRm6jcnfTf0jSAbmvLfhO3KBMt4px+1xaereWXp8Xg=
```
If specifying a Git remote URL in your flake, you can use any remotes that
are specified on the README (the mirrors), such as the GitHub: `github:girlbossceo/conduwuit`
### NixOS module
The `flake.nix` and `default.nix` do not currently provide a NixOS module (contributions
welcome!), so [`services.matrix-conduit`][module] from Nixpkgs can be used to configure
conduwuit.
### Conduit NixOS Config Module and SQLite
Beware! The [`services.matrix-conduit`][module] module defaults to SQLite as a database backend.
Conduwuit dropped SQLite support in favor of exclusively supporting the much faster RocksDB.
Make sure that you are using the RocksDB backend before migrating!
There is a [tool to migrate a Conduit SQLite database to
RocksDB](https://github.com/ShadowJonathan/conduit_toolbox/).
If you want to run the latest code, you should get conduwuit from the `flake.nix`
or `default.nix` and set [`services.matrix-conduit.package`][package]
appropriately to use conduwuit instead of Conduit.
### UNIX sockets
Due to the lack of a conduwuit NixOS module, when using the `services.matrix-conduit` module
a workaround like the one below is necessary to use UNIX sockets. This is because the UNIX
socket option does not exist in Conduit, and the module forcibly sets the `address` and
`port` config options.
```nix
options.services.matrix-conduit.settings = lib.mkOption {
apply = old: old // (
if (old.global ? "unix_socket_path")
then { global = builtins.removeAttrs old.global [ "address" "port" ]; }
else { }
);
};
```
Additionally, the [`matrix-conduit` systemd unit][systemd-unit] in the module does not allow
the `AF_UNIX` socket address family in their systemd unit's `RestrictAddressFamilies=` which
disallows the namespace from accessing or creating UNIX sockets and has to be enabled like so:
```nix
systemd.services.conduit.serviceConfig.RestrictAddressFamilies = [ "AF_UNIX" ];
```
Even though those workarounds are feasible a conduwuit NixOS configuration module, developed and
published by the community, would be appreciated.
### jemalloc and hardened profile
conduwuit uses jemalloc by default. This may interfere with the [`hardened.nix` profile][hardened.nix]
due to them using `scudo` by default. You must either disable/hide `scudo` from conduwuit, or
disable jemalloc like so:
```nix
let
conduwuit = pkgs.unstable.conduwuit.override {
enableJemalloc = false;
};
in
```
[lix]: https://lix.systems/
[module]: https://search.nixos.org/options?channel=unstable&query=services.matrix-conduit
[package]: https://search.nixos.org/options?channel=unstable&query=services.matrix-conduit.package
[hardened.nix]: https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/profiles/hardened.nix#L22
[systemd-unit]: https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/matrix/conduit.nix#L132