diff --git a/checks/default.nix b/checks/default.nix
index 674b19d..737313d 100644
--- a/checks/default.nix
+++ b/checks/default.nix
@@ -6,6 +6,8 @@ let
 in
 {
   x86_64-linux = lib.mergeAttrsList [
+    flake-inputs.self.nixosConfigurations.hetzner-1.config.serviceTests
+
     {
       nix = checkLib.mkLint {
         name = "nix-lints";
diff --git a/configuration/default.nix b/configuration/default.nix
index 9881db2..464f7ed 100644
--- a/configuration/default.nix
+++ b/configuration/default.nix
@@ -1,5 +1,5 @@
 {
-  config,
+  lib,
   modulesPath,
   flake-inputs,
   ...
@@ -9,25 +9,11 @@
     flake-inputs.disko.nixosModules.disko
     flake-inputs.sops-nix.nixosModules.sops
     flake-inputs.tlaternet-webserver.nixosModules.default
-
     "${modulesPath}/profiles/minimal.nix"
-    (import ../modules)
 
-    ./services/backups.nix
-    ./services/battery-manager.nix
-    ./services/conduit
-    ./services/crowdsec.nix
-    ./services/foundryvtt.nix
-    ./services/gitea.nix
-    ./services/immich.nix
-    ./services/metrics
-    ./services/minecraft.nix
-    ./services/nextcloud.nix
-    ./services/webserver.nix
-    ./services/wireguard.nix
-    # ./services/starbound.nix -- Not currently used
-    ./services/postgres.nix
+    ../modules
     ./nginx
+    ./services
   ];
 
   nix = {
@@ -39,49 +25,9 @@
     settings.trusted-users = [ "@wheel" ];
   };
 
-  # Optimization for minecraft servers, see:
-  # https://bugs.mojang.com/browse/MC-183518
-  boot.kernelParams = [
-    "highres=off"
-    "nohz=off"
-  ];
-
   networking = {
     usePredictableInterfaceNames = false;
     useDHCP = false;
-
-    firewall = {
-      allowedTCPPorts = [
-        # http
-        80
-        443
-        # ssh
-        2222
-        # matrix
-        8448
-        # starbound
-        21025
-
-        config.services.coturn.listening-port
-        config.services.coturn.tls-listening-port
-        config.services.coturn.alt-listening-port
-        config.services.coturn.alt-tls-listening-port
-      ];
-
-      allowedUDPPorts = [
-        config.services.coturn.listening-port
-        config.services.coturn.tls-listening-port
-        config.services.coturn.alt-listening-port
-        config.services.coturn.alt-tls-listening-port
-      ];
-
-      allowedUDPPortRanges = [
-        {
-          from = config.services.coturn.min-port;
-          to = config.services.coturn.max-port;
-        }
-      ];
-    };
   };
 
   systemd.network.enable = true;
@@ -124,7 +70,7 @@
   sops.defaultSopsFile = ../keys/production.yaml;
 
   # Remove some unneeded packages
-  environment.defaultPackages = [ ];
+  environment.defaultPackages = lib.mkForce [ ];
 
   system.stateVersion = "20.09";
 }
diff --git a/configuration/nginx/logging.nix b/configuration/nginx/logging.nix
index 0c6a955..e41bfae 100644
--- a/configuration/nginx/logging.nix
+++ b/configuration/nginx/logging.nix
@@ -1,4 +1,10 @@
-{ config, lib, ... }:
+{
+  flake-inputs,
+  pkgs,
+  config,
+  lib,
+  ...
+}:
 let
   hostNames = lib.attrNames config.services.nginx.virtualHosts;
   logPath = name: "/var/log/nginx/${name}/access.log";
@@ -80,5 +86,55 @@ in
         };
       };
     };
+
+    serviceTests =
+      let
+        testHostConfig =
+          { config, ... }:
+          {
+            imports = [
+              ./.
+              ../../modules/serviceTests/mocks.nix
+            ];
+
+            networking.firewall.allowedTCPPorts = [ 80 ];
+
+            services.nginx = {
+              domain = "testHost";
+              virtualHosts."${config.services.nginx.domain}".locations."/".return = "200 ok";
+            };
+          };
+      in
+      {
+        nginxMetricsWork = pkgs.testers.runNixOSTest {
+          name = "nginx-metrics-work";
+          node.specialArgs = { inherit flake-inputs; };
+
+          nodes = {
+            testHost = testHostConfig;
+
+            client =
+              { pkgs, ... }:
+              {
+                environment.systemPackages = [ pkgs.curl ];
+              };
+          };
+
+          testScript = ''
+            import time
+
+            start_all()
+
+            testHost.wait_for_unit("nginx.service")
+            client.succeed("curl --max-time 10 http://testHost")
+
+            # Wait a bit for the prometheus exporter to scrape our logs
+            time.sleep(5)
+
+            res = testHost.succeed("curl localhost:${builtins.toString config.services.prometheus.exporters.nginxlog.port}/metrics")
+            assert 'nginxlog_http_response_count_total{method="GET",status="200",vhost="testHost"} 1' in res, res
+          '';
+        };
+      };
   };
 }
diff --git a/configuration/nginx/ssl.nix b/configuration/nginx/ssl.nix
index 7abc38e..dc2b999 100644
--- a/configuration/nginx/ssl.nix
+++ b/configuration/nginx/ssl.nix
@@ -1,4 +1,5 @@
 {
+  flake-inputs,
   pkgs,
   config,
   lib,
@@ -69,5 +70,72 @@
       "porkbun/api-key".owner = "acme";
       "porkbun/secret-api-key".owner = "acme";
     };
+
+    serviceTests =
+      let
+        testHostConfig =
+          { config, ... }:
+          {
+            imports = [
+              ./.
+              ../../modules/serviceTests/mocks.nix
+            ];
+
+            networking.firewall.allowedTCPPorts = [
+              80
+              443
+            ];
+
+            security.acme.certs."tlater.net".extraDomainNames = [ config.services.nginx.domain ];
+
+            services.nginx = {
+              domain = "testHost";
+
+              virtualHosts."${config.services.nginx.domain}" = {
+                useACMEHost = "tlater.net";
+                forceSSL = true;
+                enableHSTS = true;
+                locations."/".return = "200 ok";
+              };
+            };
+          };
+      in
+      {
+        hstsIsSet = pkgs.testers.runNixOSTest {
+          name = "hsts-is-set";
+
+          node.specialArgs = { inherit flake-inputs; };
+          nodes = {
+            testHost = testHostConfig;
+
+            client =
+              { pkgs, ... }:
+              {
+                environment.systemPackages = [ pkgs.curl ];
+              };
+          };
+
+          testScript = ''
+            start_all()
+
+            testHost.wait_for_unit("nginx.service")
+            testHost.copy_from_vm("/var/lib/acme/tlater.net/", "certs")
+            client.copy_from_host(f"{testHost.out_dir}/certs", "/certs")
+
+            client.succeed("curl --max-time 10 http://testHost")
+            res = client.succeed(" ".join([
+                "curl",
+                "--show-error",
+                "--silent",
+                "--dump-header -",
+                "--cacert /certs/tlater.net/fullchain.pem",
+                "https://testHost",
+                "-o /dev/null"
+            ]))
+
+            assert "strict-transport-security: max-age=15552000; includeSubDomains" in res
+          '';
+        };
+      };
   };
 }
diff --git a/configuration/services/conduit/default.nix b/configuration/services/conduit/default.nix
index 6e01e81..b6f8f27 100644
--- a/configuration/services/conduit/default.nix
+++ b/configuration/services/conduit/default.nix
@@ -17,6 +17,36 @@ in
     ./matrix-hookshot.nix
   ];
 
+  networking.firewall = {
+    allowedTCPPorts = [
+      # These are for "normal" clients
+      80
+      443
+
+      # Federation happens on 8448
+      8448
+
+      config.services.coturn.listening-port
+      config.services.coturn.tls-listening-port
+      config.services.coturn.alt-listening-port
+      config.services.coturn.alt-tls-listening-port
+    ];
+
+    allowedUDPPorts = [
+      config.services.coturn.listening-port
+      config.services.coturn.tls-listening-port
+      config.services.coturn.alt-listening-port
+      config.services.coturn.alt-tls-listening-port
+    ];
+
+    allowedUDPPortRanges = [
+      {
+        from = config.services.coturn.min-port;
+        to = config.services.coturn.max-port;
+      }
+    ];
+  };
+
   services = {
     matrix-conduit = {
       enable = true;
diff --git a/configuration/services/default.nix b/configuration/services/default.nix
new file mode 100644
index 0000000..adc4482
--- /dev/null
+++ b/configuration/services/default.nix
@@ -0,0 +1,18 @@
+{
+  imports = [
+    ./backups.nix
+    ./battery-manager.nix
+    ./conduit
+    ./crowdsec.nix
+    ./foundryvtt.nix
+    ./gitea.nix
+    ./immich.nix
+    ./metrics
+    ./minecraft.nix
+    ./nextcloud.nix
+    ./postgres.nix
+    # ./starbound.nix -- Not currently used
+    ./webserver.nix
+    ./wireguard.nix
+  ];
+}
diff --git a/configuration/services/foundryvtt.nix b/configuration/services/foundryvtt.nix
index 6c475a3..5c8a21f 100644
--- a/configuration/services/foundryvtt.nix
+++ b/configuration/services/foundryvtt.nix
@@ -11,6 +11,11 @@ in
 {
   imports = [ flake-inputs.foundryvtt.nixosModules.foundryvtt ];
 
+  networking.firewall.allowedTCPPorts = [
+    80
+    443
+  ];
+
   services = {
     foundryvtt = {
       enable = true;
diff --git a/configuration/services/gitea.nix b/configuration/services/gitea.nix
index 613d30c..b4dd719 100644
--- a/configuration/services/gitea.nix
+++ b/configuration/services/gitea.nix
@@ -8,6 +8,11 @@ let
   domain = "gitea.${config.services.nginx.domain}";
 in
 {
+  networking.firewall.allowedTCPPorts = [
+    80
+    443
+  ];
+
   services = {
     forgejo = {
       enable = true;
diff --git a/configuration/services/immich.nix b/configuration/services/immich.nix
index 516ea3e..39673d0 100644
--- a/configuration/services/immich.nix
+++ b/configuration/services/immich.nix
@@ -8,6 +8,11 @@ let
   hostName = "immich.${config.services.nginx.domain}";
 in
 {
+  networking.firewall.allowedTCPPorts = [
+    80
+    443
+  ];
+
   services = {
     immich = {
       enable = true;
diff --git a/configuration/services/metrics/grafana.nix b/configuration/services/metrics/grafana.nix
index f4b6956..765a364 100644
--- a/configuration/services/metrics/grafana.nix
+++ b/configuration/services/metrics/grafana.nix
@@ -3,6 +3,11 @@ let
   domain = "metrics.${config.services.nginx.domain}";
 in
 {
+  networking.firewall.allowedTCPPorts = [
+    80
+    443
+  ];
+
   services.grafana = {
     enable = true;
     settings = {
diff --git a/configuration/services/nextcloud.nix b/configuration/services/nextcloud.nix
index ef2a6ac..77cfa4c 100644
--- a/configuration/services/nextcloud.nix
+++ b/configuration/services/nextcloud.nix
@@ -9,6 +9,11 @@ let
   hostName = "nextcloud.${config.services.nginx.domain}";
 in
 {
+  networking.firewall.allowedTCPPorts = [
+    80
+    443
+  ];
+
   services = {
     nextcloud = {
       inherit hostName;
diff --git a/configuration/services/starbound.nix b/configuration/services/starbound.nix
index a667b57..6b97471 100644
--- a/configuration/services/starbound.nix
+++ b/configuration/services/starbound.nix
@@ -8,6 +8,8 @@ let
   inherit (lib) concatStringsSep;
 in
 {
+  networking.firewall.allowedTCPPorts = [ 21025 ];
+
   # Sadly, steam-run requires some X libs
   environment.noXlibs = false;
 
diff --git a/configuration/services/webserver.nix b/configuration/services/webserver.nix
index 864f6c0..8f08e4f 100644
--- a/configuration/services/webserver.nix
+++ b/configuration/services/webserver.nix
@@ -3,6 +3,11 @@ let
   inherit (config.services.nginx) domain;
 in
 {
+  networking.firewall.allowedTCPPorts = [
+    80
+    443
+  ];
+
   services.tlaternet-webserver = {
     enable = true;
     listen = {
diff --git a/modules/default.nix b/modules/default.nix
index 9483c66..1bf5314 100644
--- a/modules/default.nix
+++ b/modules/default.nix
@@ -1 +1,6 @@
-{ imports = [ ./crowdsec ]; }
+{
+  imports = [
+    ./crowdsec
+    ./serviceTests/stub.nix
+  ];
+}
diff --git a/modules/serviceTests/mocks.nix b/modules/serviceTests/mocks.nix
new file mode 100644
index 0000000..f864253
--- /dev/null
+++ b/modules/serviceTests/mocks.nix
@@ -0,0 +1,27 @@
+/**
+  Module containing mock definitions for service test runners.
+*/
+{ flake-inputs, lib, ... }:
+{
+  imports = [
+    flake-inputs.sops-nix.nixosModules.sops
+    ../.
+    ../../configuration/services/backups.nix
+  ];
+
+  sops.defaultSopsFile = ../../keys/staging.yaml;
+  environment.etc."staging.key" = {
+    mode = "0400";
+    source = ../../keys/hosts/staging.key;
+  };
+  services.openssh = {
+    enable = true;
+    hostKeys = lib.mkForce [
+      {
+        type = "rsa";
+        bits = 4096;
+        path = "/etc/staging.key";
+      }
+    ];
+  };
+}
diff --git a/modules/serviceTests/stub.nix b/modules/serviceTests/stub.nix
new file mode 100644
index 0000000..d4a4b78
--- /dev/null
+++ b/modules/serviceTests/stub.nix
@@ -0,0 +1,20 @@
+/**
+  Module to make writing service-specific tests easy.
+*/
+{ lib, ... }:
+let
+  inherit (lib) mkOption types;
+in
+{
+  options = {
+    serviceTests = mkOption {
+      type = types.attrsOf types.package;
+
+      description = ''
+        NixOS tests to run.
+      '';
+
+      default = { };
+    };
+  };
+}