feat(nixos-server): Set static IP

home-manager/modules/ssh.nix

@@ -13,7 +13,7 @@ in {
     enable = true;
     forwardAgent = true;
     matchBlocks = {
-      "nixos-server".hostname = "192.168.189.2";
+      "nixos-server".hostname = import ../../hosts/server/ip.nix;
       "gitlab.1password.io" = {
         port = 2227;
         hostname = "ssh.gitlab.1password.io";

hosts/server/hardware-configuration.nix

@@ -45,7 +45,11 @@
   # still possible to use this option, but it's recommended to use it in conjunction
   # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
   networking.useDHCP = lib.mkDefault true;
-  # networking.interfaces.enp0s31f6.useDHCP = lib.mkDefault true;
+  # static IP on ethernet interface
+  networking.interfaces.enp0s31f6.ipv4.addresses = [{
+    address = import ./ip.nix;
+    prefixLength = 24;
+  }];
 
   nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
   hardware.cpu.intel.updateMicrocode =

hosts/server/ip.nix

@@ -0,0 +1 @@
+_: "192.168.189.2"

hosts/server/nextcloud.nix

@@ -1,5 +1,7 @@
 { pkgs, config, ... }:
-let port = 8888;
+let
+  port = 8888;
+  ip = import ./ip.nix;
 in {
   age.secrets.nextcloud_admin_pass = {
     file = ../../secrets/nextcloud_admin_pass.age;
@@ -19,7 +21,7 @@ in {
     phpOptions."opcache.interned_strings_buffer" = "23";
     configureRedis = true;
     maxUploadSize = "1G";
-    hostName = "192.168.189.2";
+    hostName = ip;
     home = "/mnt/nextcloud";
     config = {
       adminpassFile = config.age.secrets.nextcloud_admin_pass.path;
@@ -49,7 +51,7 @@ in {
     };
   };
   # see https://nixos.wiki/wiki/Nextcloud#Change_default_listening_port
-  services.nginx.virtualHosts."192.168.189.2".listen = [{
+  services.nginx.virtualHosts."${ip}".listen = [{
     addr = "0.0.0.0";
     inherit port;
   }];