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diff --git a/mb/2configs/headless.nix b/mb/2configs/headless.nix
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+# Common configuration for headless machines (e.g., Amazon EC2
+# instances).
+
+{ lib, ... }:
+
+with lib;
+
+{
+ boot.vesa = false;
+
+ # Don't start a tty on the serial consoles.
+ systemd.services."serial-getty@ttyS0".enable = false;
+ systemd.services."serial-getty@hvc0".enable = false;
+ systemd.services."getty@tty1".enable = false;
+ systemd.services."autovt@".enable = false;
+
+ # Since we can't manually respond to a panic, just reboot.
+ boot.kernelParams = [ "panic=1" "boot.panic_on_fail" ];
+
+ # Don't allow emergency mode, because we don't have a console.
+ systemd.enableEmergencyMode = false;
+
+ # Being headless, we don't need a GRUB splash image.
+ boot.loader.grub.splashImage = null;
+}