Fix netconsole: configure via configfs after network up.

The modprobe.conf approach failed because the network interface
doesn't exist when the module loads at boot. Now using a systemd
service to configure netconsole via configfs after network-online.

Also raise console_loglevel to 8 so all kernel messages (not just
KERN_WARNING and above) are sent to netconsole.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

hosts/beefy/default.nix

@@ -24,10 +24,27 @@
   boot.kernelParams = [ "consoleblank=300" "nmi_watchdog=1" ];
 
   # Netconsole - stream kernel messages to zippy (192.168.1.2)
+  # Must configure via configfs after network is up (interface doesn't exist at module load)
   boot.kernelModules = [ "netconsole" ];
-  boot.extraModprobeConfig = ''
+  boot.kernel.sysctl."kernel.printk" = "8 4 1 7";  # Raise console_loglevel to send all messages
-    options netconsole netconsole=@/enp1s0,6666@192.168.1.2/c0:3f:d5:62:55:bb
+  systemd.services.netconsole-sender = {
-  '';
+    description = "Configure netconsole to send kernel messages to zippy";
+    wantedBy = [ "multi-user.target" ];
+    after = [ "network-online.target" ];
+    wants = [ "network-online.target" ];
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = true;
+    };
+    script = ''
+      mkdir -p /sys/kernel/config/netconsole/target1
+      echo enp1s0 > /sys/kernel/config/netconsole/target1/dev_name
+      echo 192.168.1.2 > /sys/kernel/config/netconsole/target1/remote_ip
+      echo 6666 > /sys/kernel/config/netconsole/target1/remote_port
+      echo c0:3f:d5:62:55:bb > /sys/kernel/config/netconsole/target1/remote_mac
+      echo 1 > /sys/kernel/config/netconsole/target1/enabled
+    '';
+  };
 
   # Kdump for kernel crash analysis
   boot.crashDump = {