Merge pull request #329 from ryan4yin/youko-shushou-ssd-swap

hosts: swap youko/shushou roles to fix Jellyfin HDR transcoding

hosts/12kingdoms-shushou/microvm.nix

@@ -24,20 +24,6 @@
     config.imports = [ ../k8s/k3s-test-1-master-3 ];
   };
 
-  microvm.vms.k3s-test-1-worker-2 = {
-    autostart = true;
-    restartIfChanged = true;
-    specialArgs = {
-      inherit
-        myvars
-        mylib
-        agenix
-        mysecrets
-        ;
-    };
-    config.imports = [ ../k8s/k3s-test-1-worker-2 ];
-  };
-
   microvm.vms.k3s-test-1-worker-3 = {
     autostart = true;
     restartIfChanged = true;
@@ -54,8 +40,7 @@
 
   # Attach the guest's tap to the VM bridge, the same way the physical NIC is
   # attached. The tap name is derived from the guest IP (192.168.5.116 -> vm116,
-  # 192.168.5.112 -> vm112, 192.168.5.113 -> vm113), as IFNAMSIZ caps interface
-  # names at 15 characters.
+  # 192.168.5.113 -> vm113), as IFNAMSIZ caps interface names at 15 characters.
   systemd.network.networks."20-vm116" = {
     matchConfig.Name = [ "vm116" ];
     networkConfig = {
@@ -64,14 +49,6 @@
     };
     linkConfig.RequiredForOnline = "no";
   };
-  systemd.network.networks."20-vm112" = {
-    matchConfig.Name = [ "vm112" ];
-    networkConfig = {
-      LinkLocalAddressing = "no";
-      Bridge = "br0";
-    };
-    linkConfig.RequiredForOnline = "no";
-  };
   systemd.network.networks."20-vm113" = {
     matchConfig.Name = [ "vm113" ];
     networkConfig = {

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

@@ -100,10 +100,12 @@ in
           params.ups = [ "homelab" ];
           static_configs = [
             {
-              targets = [ "${myvars.networking.hostsAddr.shushou.ipv4}:9199" ];
+              # same-host nut exporter bound to loopback (127.0.0.1:9199); the
+              # UPS moved to this host with the SSD swap
+              targets = [ "127.0.0.1:9199" ];
               labels.type = "app";
               labels.app = "nut";
-              labels.host = "shushou";
+              labels.host = "youko";
               labels.env = "homelab";
               labels.cluster = "homelab";
             }

hosts/12kingdoms-youko/microvm.nix

@@ -24,8 +24,25 @@
     config.imports = [ ../k8s/k3s-test-1-master-2 ];
   };
 
+  # Moved here from shushou after the SSD swap: the 5625U there is weaker and has
+  # only 22 GiB, too little for this 16 GiB worker.
+  microvm.vms.k3s-test-1-worker-2 = {
+    autostart = true;
+    restartIfChanged = true;
+    specialArgs = {
+      inherit
+        myvars
+        mylib
+        agenix
+        mysecrets
+        ;
+    };
+    config.imports = [ ../k8s/k3s-test-1-worker-2 ];
+  };
+
   # Attach the guest's tap to the VM bridge, the same way the physical NIC is
-  # attached. The tap name is derived from the guest IP (192.168.5.115 -> vm115).
+  # attached. The tap name is derived from the guest IP (192.168.5.115 -> vm115,
+  # 192.168.5.112 -> vm112), as IFNAMSIZ caps interface names at 15 characters.
   systemd.network.networks."20-vm115" = {
     matchConfig.Name = [ "vm115" ];
     networkConfig = {
@@ -34,4 +51,12 @@
     };
     linkConfig.RequiredForOnline = "no";
   };
+  systemd.network.networks."20-vm112" = {
+    matchConfig.Name = [ "vm112" ];
+    networkConfig = {
+      LinkLocalAddressing = "no";
+      Bridge = "br0";
+    };
+    linkConfig.RequiredForOnline = "no";
+  };
 }

hosts/12kingdoms-youko/ups.nix

@@ -1,13 +1,12 @@
-{ myvars, ... }:
-let
-  hostAddress = myvars.networking.hostsAddr.shushou.ipv4;
-in
+{ ... }:
 {
+  # The UPS (Cypress USB-to-serial, 0665:5161) is attached to this host, which is
+  # now the homelab core. Metrics only for now; coordinated shutdown of all
+  # homelab hosts is a separate feature.
   power.ups = {
     enable = true;
     mode = "standalone";
 
-    # Metrics only. Coordinated shutdown of all homelab hosts is a separate feature.
     upsmon = {
       enable = false;
       settings.POWERDOWNFLAG = null;
@@ -33,7 +32,7 @@ in
 
   services.prometheus.exporters.nut = {
     enable = true;
-    listenAddress = hostAddress;
+    listenAddress = "127.0.0.1";
     port = 9199;
     nutServer = "127.0.0.1";
 

hosts/README.md

@@ -34,20 +34,29 @@ Named after characters from "Frieren: Beyond Journey's End":
 
 Named after "Twelve Kingdoms":
 
-| Host      | Platform | Hardware                               | Purpose                | Status    |
-| --------- | -------- | -------------------------------------- | ---------------------- | --------- |
-| `shoukei` | NixOS    | MacBook Pro M2                         | NixOS on Apple Silicon | ✅ Active |
-| `shoryu`  | NixOS    | MoreFine S500Plus (AMD Ryzen 9 5900HX) | VM Host                | ✅ Active |
-| `shushou` | NixOS    | MinisForum UM560 (AMD Ryzen 5 5625U)   | VM Host                | ✅ Active |
-| `youko`   | NixOS    | MinisForum HX99G (AMD Ryzen 9 6900HX)  | VM Host                | ✅ Active |
+| Host      | Platform | Hardware                             | Purpose                | Status    |
+| --------- | -------- | ------------------------------------ | ---------------------- | --------- |
+| `shoukei` | NixOS    | MacBook Pro M2                       | NixOS on Apple Silicon | ✅ Active |
+| `shoryu`  | NixOS    | MoreFine S500+ (AMD Ryzen 7 5825U)   | VM Host                | ✅ Active |
+| `shushou` | NixOS    | MinisForum UM560 (AMD Ryzen 5 5625U) | VM Host                | ✅ Active |
+| `youko`   | NixOS    | Beelink GTR5 (AMD Ryzen 9 5900HX)    | Homelab Core           | ✅ Active |
+
+On 2026-09-29 the NVMe SSDs of `youko` and `shushou` were physically swapped, and the 2×4TB USB HDDs
+moved with the `youko` role to the other chassis. The reason was Jellyfin: HDR transcoding on the
+5625U's Barceló iGPU could not keep up (~0.4–0.8×), while the 5900HX's Cezanne iGPU can (~1.68× for
+1080p HDR). So the homelab-core role (all services + one k3s VM + the HDDs + the UPS) now runs on
+the Beelink GTR5 and the k3s VM-host role on the UM560; the other services moving along is a side
+effect of swapping the role's disk, not a separate migration. Hostnames, IPs, and state followed the
+disks.
 
 ### Virtual Machines & Clusters
 
 #### `k8s` - Kubernetes Infrastructure
 
 - **VM Cluster**: 3 physical mini PCs (shoryu, shushou, youko) running all VMs
-- **K3s Testing**: `k3s-test-1-master-{1,2,3}` (control plane) + `k3s-test-1-worker-{1,2,3}`
-  (workloads; two on `shushou`, one on `shoryu`), running as microVMs
+- **K3s Testing**: `k3s-test-1-master-{1,2,3}` (control plane; one per host) +
+  `k3s-test-1-worker-{1,2,3}` (workloads; `worker-1` on `shoryu`, `worker-2` on `youko`, `worker-3`
+  on `shushou`), running as microVMs
 
 ### External Systems
 

hosts/k8s/k3s-test-1-master-3/default.nix

@@ -13,7 +13,7 @@ let
     inherit pkgs hostName;
     inherit (myvars) networking;
     vcpu = 2;
-    mem = 8192;
+    mem = 4096;
     varSize = 20480;
   };
   k3sModule = mylib.genK3sServerModule {

outputs/x86_64-linux/tests/ups-metrics/expected.nix

@@ -18,7 +18,7 @@
 
   exporter = {
     enable = true;
-    listenAddress = "192.168.5.182";
+    listenAddress = "127.0.0.1";
     port = 9199;
     nutServer = "127.0.0.1";
     exportsAllNumericVariables = true;
@@ -32,11 +32,11 @@
     scrape_interval = "30s";
     metrics_path = "/ups_metrics";
     params.ups = [ "homelab" ];
-    target = "192.168.5.182:9199";
+    target = "127.0.0.1:9199";
     labels = {
       type = "app";
       app = "nut";
-      host = "shushou";
+      host = "youko";
       env = "homelab";
       cluster = "homelab";
     };

outputs/x86_64-linux/tests/ups-metrics/expr.nix

@@ -4,27 +4,28 @@
   ...
 }:
 let
-  shushou = outputs.nixosConfigurations.shushou.config;
-  aquamarine = outputs.nixosConfigurations.youko.config;
-  ups = shushou.power.ups.ups.homelab or { };
-  exporter = shushou.services.prometheus.exporters.nut;
+  # The UPS moved to youko with the SSD swap; the NUT daemons, the exporter, and
+  # the victoriametrics scrape job now all live on the same host.
+  youko = outputs.nixosConfigurations.youko.config;
+  ups = youko.power.ups.ups.homelab or { };
+  exporter = youko.services.prometheus.exporters.nut;
   exporterService =
-    shushou.systemd.services.prometheus-nut-exporter or {
+    youko.systemd.services.prometheus-nut-exporter or {
       after = [ ];
       requires = [ ];
     };
   scrapeJobs = builtins.filter (
     job: (job.job_name or "") == "nut-exporter-homelab-ups"
-  ) aquamarine.services.victoriametrics.prometheusConfig.scrape_configs;
+  ) youko.services.victoriametrics.prometheusConfig.scrape_configs;
   scrapeJob = if builtins.length scrapeJobs == 1 then builtins.head scrapeJobs else null;
 in
 {
   nut = {
-    enable = shushou.power.ups.enable;
-    mode = shushou.power.ups.mode;
-    upsmonEnable = shushou.power.ups.upsmon.enable;
-    killPowerEnable = shushou.systemd.services.ups-killpower.enable or false;
-    upsdListen = shushou.power.ups.upsd.listen;
+    enable = youko.power.ups.enable;
+    mode = youko.power.ups.mode;
+    upsmonEnable = youko.power.ups.upsmon.enable;
+    killPowerEnable = youko.systemd.services.ups-killpower.enable or false;
+    upsdListen = youko.power.ups.upsd.listen;
     driver = ups.driver or null;
     port = ups.port or null;
     vendorId = builtins.elem "vendorid = 0665" (ups.directives or [ ]);