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# Conduit for Nix/NixOS
This guide assumes you have a recent version of Nix (^2.4) installed.
Since Conduit ships as a Nix flake, you'll first need to [enable
flakes][enable_flakes].
You can now use the usual Nix commands to interact with Conduit's flake. For
example, `nix run gitlab:famedly/conduit` will run Conduit (though you'll need
to provide configuration and such manually as usual).
If your NixOS configuration is defined as a flake, you can depend on this flake
to provide a more up-to-date version than provided by `nixpkgs`. In your flake,
add the following to your `inputs`:
```nix
conduit = {
url = "gitlab:famedly/conduit";
# Assuming you have an input for nixpkgs called `nixpkgs`. If you experience
# build failures while using this, try commenting/deleting this line. This
# will probably also require you to always build from source.
inputs.nixpkgs.follows = "nixpkgs";
};
```
Next, make sure you're passing your flake inputs to the `specialArgs` argument
of `nixpkgs.lib.nixosSystem` [as explained here][specialargs]. This guide will
assume you've named the group `flake-inputs`.
Now you can configure Conduit and a reverse proxy for it. Add the following to
a new Nix file and include it in your configuration:
```nix
{ config
, pkgs
, flake-inputs
, ...
}:
let
# You'll need to edit these values
# The hostname that will appear in your user and room IDs
server_name = "example.com";
# The hostname that Conduit actually runs on
#
# This can be the same as `server_name` if you want. This is only necessary
# when Conduit is running on a different machine than the one hosting your
# root domain. This configuration also assumes this is all running on a single
# machine, some tweaks will need to be made if this is not the case.
matrix_hostname = "matrix.${server_name}";
# An admin email for TLS certificate notifications
admin_email = "admin@${server_name}";
# These ones you can leave alone
# Build a dervation that stores the content of `${server_name}/.well-known/matrix/server`
well_known_server = pkgs.writeText "well-known-matrix-server" ''
{
"m.server": "${matrix_hostname}"
}
'';
# Build a dervation that stores the content of `${server_name}/.well-known/matrix/client`
well_known_client = pkgs.writeText "well-known-matrix-client" ''
{
"m.homeserver": {
"base_url": "https://${matrix_hostname}"
}
}
'';
in
{
# Configure Conduit itself
services.matrix-conduit = {
enable = true;
# This causes NixOS to use the flake defined in this repository instead of
# the build of Conduit built into nixpkgs.
package = flake-inputs.conduit.packages.${pkgs.system}.default;
settings.global = {
inherit server_name;
};
};
# Configure automated TLS acquisition/renewal
security.acme = {
acceptTerms = true;
defaults = {
email = admin_email;
};
};
# ACME data must be readable by the NGINX user
users.users.nginx.extraGroups = [
"acme"
];
# Configure NGINX as a reverse proxy
services.nginx = {
enable = true;
recommendedProxySettings = true;
virtualHosts = {
"${server_name}" = {
forceSSL = true;
enableACME = true;
listen = [
{
addr = "0.0.0.0";
port = 443;
ssl = true;
}
{
addr = "0.0.0.0";
port = 8448;
ssl = true;
}
];
extraConfig = ''
merge_slashes off;
'';
"${matrix_hostname}" = {
forceSSL = true;
enableACME = true;
locations."/_matrix/" = {
proxyPass = "http://backend_conduit$request_uri";
proxyWebsockets = true;
extraConfig = ''
proxy_set_header Host $host;
proxy_buffering off;
'';
};
locations."=/.well-known/matrix/server" = {
# Use the contents of the derivation built previously
alias = "${well_known_server}";
extraConfig = ''
# Set the header since by default NGINX thinks it's just bytes
default_type application/json;
'';
};
locations."=/.well-known/matrix/client" = {
# Use the contents of the derivation built previously
alias = "${well_known_client}";
extraConfig = ''
# Set the header since by default NGINX thinks it's just bytes
default_type application/json;
# https://matrix.org/docs/spec/client_server/r0.4.0#web-browser-clients
add_header Access-Control-Allow-Origin "*";
'';
};
};
};
upstreams = {
"backend_conduit" = {
servers = {
"localhost:${toString config.services.matrix-conduit.settings.global.port}" = { };
};
};
};
};
# Open firewall ports for HTTP, HTTPS, and Matrix federation
networking.firewall.allowedTCPPorts = [ 80 443 8448 ];
networking.firewall.allowedUDPPorts = [ 80 443 8448 ];
}
```
Now you can rebuild your system configuration and you should be good to go!
[enable_flakes]: https://nixos.wiki/wiki/Flakes#Enable_flakes
[specialargs]: https://nixos.wiki/wiki/Flakes#Using_nix_flakes_with_NixOS
|
