57 lines
2.2 KiB
Nix
57 lines
2.2 KiB
Nix
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{
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# Name of our deployment
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network.description = "HelloWorld";
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# Enable rolling back to previous versions of our infrastructure
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network.enableRollback = true;
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# It consists of a single server named 'helloserver'
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helloserver =
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# Every server gets passed a few arguments, including a reference
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# to nixpkgs (pkgs)
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{ config, pkgs, ... }:
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let
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# We import our custom packages from ./default passing pkgs as argument
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packages = import ./default.nix { pkgs = pkgs; };
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# This is the nodejs version specified in default.nix
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nodejs = packages.nodejs;
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# And this is the application we'd like to deploy
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app = packages.app;
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in
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{
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# We'll be running our application on port 8080, because a regular
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# user cannot bind to port 80
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# Then, using some iptables magic we'll forward traffic designated to port 80 to 8080
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networking.firewall.enable = true;
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# We will open up port 22 (SSH) as well otherwise we're locking ourselves out
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networking.firewall.allowedTCPPorts = [ 80 8080 22 ];
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networking.firewall.allowPing = true;
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# Port forwarding using iptables
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networking.firewall.extraCommands = ''
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iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080
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'';
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# To run our node.js program we're going to use a systemd service
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# We can configure the service to automatically start on boot and to restart
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# the process in case it crashes
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systemd.services.helloserver = {
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description = "Hello world application";
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# Start the service after the network is available
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after = [ "network.target" ];
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# We're going to run it on port 8080 in production
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environment = { PORT = "8080"; };
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serviceConfig = {
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# The actual command to run
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ExecStart = "${nodejs}/bin/node ${app}/server.js";
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# For security reasons we'll run this process as a special 'nodejs' user
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User = "nodejs";
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Restart = "always";
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};
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};
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# And lastly we ensure the user we run our application as is created
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users.extraUsers = {
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nodejs = { };
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};
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};
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}
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