refactor: rename the three VM hosts to 12kingdoms-*

Drop the now-meaningless kubevirt- prefix and move the hosts out of
hosts/k8s/, following the existing 12kingdoms-shoukei layout: the
directory and output carry the theme prefix while the configuration,
hostname and colmena target are the bare name (shoryu, shushou, youko).

- hosts/k8s/kubevirt-* -> hosts/12kingdoms-*; the shared disko config
  becomes host-disko-fs.nix; the now-different relative imports are fixed
- outputs, vars/networking.nix keys, the Justfile recipes/tags, the eval
  tests and the docs follow
- colmena reaches these hosts by IP (a new targetHost override), since
  their DNS name changes with the hostname and is not resolvable until
  the router learns it

AGENTS.md

@@ -61,7 +61,7 @@ deployments. Keep repository guidance here; reusable global rules live in `agent
 - Deployment and upload recipes change systems; use eval/build commands for validation. Remote
   deployment requires an explicit request. When deployment behavior changes, report the exact `just`
   command to run.
-- KubeVirt hosts (`kubevirt-shoryu`/`shushou`/`youko`): avoid mid-flight restarts of the network
+- KubeVirt hosts (`shoryu`/`shushou`/`youko`): avoid mid-flight restarts of the network
   stack (`systemd-networkd` / the `br0` bridge) — that can drop the VM network. Use `boot` + serial
   reboot for networking or nixpkgs changes. See
   [hosts/README.md](./hosts/README.md#deploying-kubevirt-hosts).

Justfile

@@ -197,7 +197,7 @@ upload-vm name size verbosity="normal":
   use {{utils_nu}} *;
   upload-vm {{name}} {{size}} {{verbosity}}
 
-# Deploy all the KubeVirt nodes(Physical machines running KubeVirt)
+# Deploy all the VM hosts (physical machines running the VMs)
 [linux]
 [group('homelab')]
 lab mode="switch":
@@ -206,17 +206,17 @@ lab mode="switch":
 [linux]
 [group('homelab')]
 shoryu mode="switch":
-  colmena apply {{mode}} --on '@kubevirt-shoryu' --verbose --show-trace
+  colmena apply {{mode}} --on '@shoryu' --verbose --show-trace
 
 [linux]
 [group('homelab')]
 shushou mode="switch":
-  colmena apply {{mode}} --on '@kubevirt-shushou' --verbose --show-trace
+  colmena apply {{mode}} --on '@shushou' --verbose --show-trace
 
 [linux]
 [group('homelab')]
 youko mode="switch":
-  colmena apply {{mode}} --on '@kubevirt-youko' --verbose --show-trace
+  colmena apply {{mode}} --on '@youko' --verbose --show-trace
 
 ############################################################################
 #

Virtual-Machine.md

@@ -1,6 +1,6 @@
 ## How to create & managage KubeVirt's Virtual Machine from this flake?
 
-> [!NOTE] KubeVirt is being retired. aquamarine runs natively on `kubevirt-youko` and the k3s-test
+> [!NOTE] KubeVirt is being retired. aquamarine runs natively on `youko` and the k3s-test
 > nodes run as [microVMs](./hosts/k8s/README.md); this document only covers the KubeVirt VMs that
 > are left to move (currently the Windows VM).
 
@@ -22,7 +22,7 @@ commands:
 
 ```shell
 just col aquamarine
-just col kubevirt-shoryu
+just col shoryu
 
 # Set a configuration for the next boot instead of switching immediately
 just col aquamarine boot

hosts/12kingdoms-shoryu/default.nix

@@ -8,7 +8,7 @@
 }:
 let
   # MoreFine - S500Plus
-  hostName = "kubevirt-shoryu"; # Define your hostname.
+  hostName = "shoryu"; # Define your hostname.
 
   coreModule = mylib.genVmHostModule {
     inherit pkgs hostName;
@@ -18,7 +18,7 @@ in
 {
   imports = (mylib.scanPaths ./.) ++ [
     disko.nixosModules.default
-    ../disko-config/kubevirt-disko-fs.nix
+    ../k8s/disko-config/host-disko-fs.nix
     ./hardware-configuration.nix
     ./preservation.nix
     coreModule

hosts/12kingdoms-shoryu/microvm.nix

@@ -21,7 +21,7 @@
         mysecrets
         ;
     };
-    config.imports = [ ../k3s-test-1-master-1 ];
+    config.imports = [ ../k8s/k3s-test-1-master-1 ];
   };
 
   # Attach the guest's tap to the VM bridge, the same way the physical NIC is

hosts/12kingdoms-shushou/default.nix

@@ -7,7 +7,7 @@
   ...
 }:
 let
-  hostName = "kubevirt-shushou"; # Define your hostname.
+  hostName = "shushou"; # Define your hostname.
 
   coreModule = mylib.genVmHostModule {
     inherit pkgs hostName;
@@ -17,9 +17,9 @@ in
 {
   imports = (mylib.scanPaths ./.) ++ [
     disko.nixosModules.default
-    ../disko-config/kubevirt-disko-fs.nix
+    ../k8s/disko-config/host-disko-fs.nix
-    ../kubevirt-shoryu/hardware-configuration.nix
+    ../12kingdoms-shoryu/hardware-configuration.nix
-    ../kubevirt-shoryu/preservation.nix
+    ../12kingdoms-shoryu/preservation.nix
     coreModule
   ];
 

hosts/12kingdoms-shushou/microvm.nix

@@ -21,7 +21,7 @@
         mysecrets
         ;
     };
-    config.imports = [ ../k3s-test-1-master-3 ];
+    config.imports = [ ../k8s/k3s-test-1-master-3 ];
   };
 
   # Attach the guest's tap to the VM bridge, the same way the physical NIC is

hosts/12kingdoms-shushou/ups.nix

@@ -1,6 +1,6 @@
 { myvars, ... }:
 let
-  hostAddress = myvars.networking.hostsAddr.kubevirt-shushou.ipv4;
+  hostAddress = myvars.networking.hostsAddr.shushou.ipv4;
 in
 {
   power.ups = {

hosts/12kingdoms-youko/default.nix

@@ -7,7 +7,7 @@
   ...
 }:
 let
-  hostName = "kubevirt-youko"; # Define your hostname.
+  hostName = "youko"; # Define your hostname.
 
   coreModule = mylib.genVmHostModule {
     inherit pkgs hostName;
@@ -17,9 +17,9 @@ in
 {
   imports = (mylib.scanPaths ./.) ++ [
     disko.nixosModules.default
-    ../disko-config/kubevirt-disko-fs.nix
+    ../k8s/disko-config/host-disko-fs.nix
-    ../kubevirt-shoryu/hardware-configuration.nix
+    ../12kingdoms-shoryu/hardware-configuration.nix
-    ../kubevirt-shoryu/preservation.nix
+    ../12kingdoms-shoryu/preservation.nix
     coreModule
   ];
 

hosts/12kingdoms-youko/homelab-services/disko-fs.nix

@@ -1,7 +1,7 @@
 # Auto disk partitioning (from repo root: nix-config):
-#   nix run github:nix-community/disko -- --mode destroy,format,mount hosts/k8s/kubevirt-youko/homelab-services/disko-fs.nix
+#   nix run github:nix-community/disko -- --mode destroy,format,mount hosts/12kingdoms-youko/homelab-services/disko-fs.nix
 # Mount only (after first format):
-#   nix run github:nix-community/disko -- --mode mount hosts/k8s/kubevirt-youko/homelab-services/disko-fs.nix
+#   nix run github:nix-community/disko -- --mode mount hosts/12kingdoms-youko/homelab-services/disko-fs.nix
 let
   cryptKeyFile = "/etc/agenix/hdd-luks-crypt-key";
   unlockDisk = "data-encrypted";

hosts/12kingdoms-youko/homelab-services/monitoring/victoriametrics.nix

@@ -101,10 +101,10 @@ in
           params.ups = [ "homelab" ];
           static_configs = [
             {
-              targets = [ "${myvars.networking.hostsAddr.kubevirt-shushou.ipv4}:9199" ];
+              targets = [ "${myvars.networking.hostsAddr.shushou.ipv4}:9199" ];
               labels.type = "app";
               labels.app = "nut";
-              labels.host = "kubevirt-shushou";
+              labels.host = "shushou";
               labels.env = "homelab";
               labels.cluster = "homelab";
             }

hosts/12kingdoms-youko/homelab-services/restic.nix

@@ -44,9 +44,9 @@ in
         backupPrepareCommand = ''
           ${pkgs.nushell}/bin/nu -c '
             let kubevirt_nodes = [
-              "kubevirt-shoryu"
+              "shoryu"
-              "kubevirt-shushou"
+              "shushou"
-              "kubevirt-youko"
+              "youko"
             ]
 
             kubevirt_nodes | each {|it|

hosts/12kingdoms-youko/microvm.nix

@@ -21,7 +21,7 @@
         mysecrets
         ;
     };
-    config.imports = [ ../k3s-test-1-master-2 ];
+    config.imports = [ ../k8s/k3s-test-1-master-2 ];
   };
 
   # Attach the guest's tap to the VM bridge, the same way the physical NIC is

hosts/README.md

@@ -104,13 +104,13 @@ Use existing hosts as templates. The key files typically include:
 ### Examples to Reference
 
 - **Desktop systems**: See `idols-ai/` for gaming/workstation setup
-- **Server systems**: See `kubevirt-shoryu/` for K8s/KubeVirt hosts
+- **Server systems**: See `shoryu/` for K8s/KubeVirt hosts
 - **macOS systems**: See `darwin-fern/` for macOS configurations
 - **Apple Silicon**: See `12kingdoms-shoukei/` for ARM Linux setup
 
 ## Deploying KubeVirt Hosts
 
-The three KubeVirt hosts (`kubevirt-shoryu`, `kubevirt-shushou`, `kubevirt-youko`) put their VMs'
+The three KubeVirt hosts (`shoryu`, `shushou`, `youko`) put their VMs'
 secondary network on the Linux bridge `br0` (attached by the `bridge` CNI plugin); the pod network
 is Cilium (flannel disabled).
 

hosts/k8s/README.md

@@ -39,11 +39,11 @@ keeps its identity and etcd membership instead of bootstraping a new cluster.
 
 ## TODO / Known issues
 
-- **Retire KubeVirt.** aquamarine now runs natively on `kubevirt-youko`, and the k3s-test masters
+- **Retire KubeVirt.** aquamarine now runs natively on `youko`, and the k3s-test masters
   run as microVMs. Remove KubeVirt/CDI/multus from the cluster (k8s-gitops) once nothing else needs
   them, and the Windows VM is the only KubeVirt VM left to move.
 - **The USB HDD bridge is flaky.** aquamarine's two HDDs sit behind a JMicron JMS567 USB-SATA bridge
-  that keeps resetting (`dmesg` on `kubevirt-youko`). Find out how often it resets and how much it
+  that keeps resetting (`dmesg` on `youko`). Find out how often it resets and how much it
   matters before putting anything critical (e.g. an NFS export) on it.
 
 ## Kubernetes Resources

hosts/k8s/disko-config/README.md

@@ -17,7 +17,7 @@ sudo nix --experimental-features "nix-command flakes" run github:nix-community/d
 systemd-cryptenroll --tpm2-device=auto --tpm2-pcrs=0+7 /dev/<encrypted-disk-part-path>
 
 ## 3. install nixos
-sudo nixos-install --root /mnt --no-root-password --show-trace --verbose --flake .#kubevirt-shoryu
+sudo nixos-install --root /mnt --no-root-password --show-trace --verbose --flake .#shoryu
 
 # enter into the installed system, check password & users
 # `su ryan` => `sudo -i` => enter ryan's password => successfully login

lib/colmenaSystem.nix

@@ -8,6 +8,9 @@
   system,
   tags,
   ssh-user,
+  # optional override; defaults to the host name. Use an IP when the host's
+  # DNS name is not resolvable yet (e.g. right after a hostname change).
+  targetHost ? null,
   genSpecialArgs,
   specialArgs ? (genSpecialArgs system),
   ...
@@ -20,7 +23,7 @@ in
   deployment = {
     inherit tags;
     targetUser = ssh-user;
-    targetHost = name; # hostName or IP address
+    targetHost = if targetHost != null then targetHost else name;
   };
 
   imports =

outputs/README.md

@@ -97,9 +97,9 @@ All the outputs of this flake are defined here.
     │   ├── k3s-test-1-worker-1.nix
     │   ├── k3s-test-1-worker-2.nix
     │   ├── k3s-test-1-worker-3.nix
-    │   ├── kubevirt-shoryu.nix
+    │   ├── shoryu.nix
-    │   ├── kubevirt-shushou.nix
+    │   ├── shushou.nix
-    │   └── kubevirt-youko.nix
+    │   └── youko.nix
     └── tests         # eval tests
         ├── home-manager
         │   ├── expected.nix

outputs/x86_64-linux/src/12kingdoms-shoryu.nix

@@ -11,7 +11,7 @@
   ...
 }@args:
 let
-  name = "kubevirt-shoryu";
+  name = "shoryu";
   tags = [
     name
     "virt-shoryu"
@@ -25,7 +25,7 @@ let
         "secrets/nixos.nix"
         "modules/nixos/server/server.nix"
         # host specific
-        "hosts/k8s/${name}"
+        "hosts/12kingdoms-${name}"
       ])
       ++ [
         {
@@ -43,7 +43,14 @@ in
 {
   nixosConfigurations.${name} = mylib.nixosSystem systemArgs;
 
-  colmena.${name} = mylib.colmenaSystem (systemArgs // { inherit tags ssh-user; });
+  colmena.${name} = mylib.colmenaSystem (
+    systemArgs
+    // {
+      inherit tags ssh-user;
+      # reach the host by IP: its DNS name changes with the hostname
+      targetHost = myvars.networking.hostsAddr.${name}.ipv4;
+    }
+  );
 
   packages.${name} = inputs.self.nixosConfigurations.${name}.config.system.build.images.iso;
 }

outputs/x86_64-linux/src/12kingdoms-shushou.nix

@@ -11,7 +11,7 @@
   ...
 }@args:
 let
-  name = "kubevirt-shushou";
+  name = "shushou";
   tags = [
     name
     "virt-shushou"
@@ -25,7 +25,7 @@ let
         "secrets/nixos.nix"
         "modules/nixos/server/server.nix"
         # host specific
-        "hosts/k8s/${name}"
+        "hosts/12kingdoms-${name}"
       ])
       ++ [
         {
@@ -40,7 +40,14 @@ in
 {
   nixosConfigurations.${name} = mylib.nixosSystem systemArgs;
 
-  colmena.${name} = mylib.colmenaSystem (systemArgs // { inherit tags ssh-user; });
+  colmena.${name} = mylib.colmenaSystem (
+    systemArgs
+    // {
+      inherit tags ssh-user;
+      # reach the host by IP: its DNS name changes with the hostname
+      targetHost = myvars.networking.hostsAddr.${name}.ipv4;
+    }
+  );
 
   packages.${name} = inputs.self.nixosConfigurations.${name}.config.system.build.images.iso;
 }

outputs/x86_64-linux/src/12kingdoms-youko.nix

@@ -11,7 +11,7 @@
   ...
 }@args:
 let
-  name = "kubevirt-youko";
+  name = "youko";
   tags = [
     name
     "virt-youko"
@@ -25,7 +25,7 @@ let
         "secrets/nixos.nix"
         "modules/nixos/server/server.nix"
         # host specific
-        "hosts/k8s/${name}"
+        "hosts/12kingdoms-${name}"
       ])
       ++ [
         {
@@ -40,7 +40,14 @@ in
 {
   nixosConfigurations.${name} = mylib.nixosSystem systemArgs;
 
-  colmena.${name} = mylib.colmenaSystem (systemArgs // { inherit tags ssh-user; });
+  colmena.${name} = mylib.colmenaSystem (
+    systemArgs
+    // {
+      inherit tags ssh-user;
+      # reach the host by IP: its DNS name changes with the hostname
+      targetHost = myvars.networking.hostsAddr.${name}.ipv4;
+    }
+  );
 
   packages.${name} = inputs.self.nixosConfigurations.${name}.config.system.build.images.iso;
 }

outputs/x86_64-linux/tests/security-aquamarine-metrics/expr.nix

@@ -3,7 +3,7 @@
   outputs,
 }:
 let
-  aqua = outputs.nixosConfigurations.kubevirt-youko.config;
+  aqua = outputs.nixosConfigurations.youko.config;
 in
 {
   v2rayExporter = aqua.services.prometheus.exporters.v2ray.listenAddress;