Add VM conf

README.md

@@ -10,6 +10,31 @@ nixos-rebuild switch --flake flake_path_directory#hostname
 nix flake update --extra-experimental-features "nix-command flakes"
 ```
 
+## Configure VM
+
+Configure VM
+```nix
+users.users.<user>.initialPassword = "<password>";
+virtualisation.vmVariant = {
+  # following configuration is added only when building VM with build-vm
+  virtualisation = {
+    memorySize = <RAM in MiB>; # Use 8192MiB memory.
+    cores = <CPU Core number>;
+    # And more here https://github.com/NixOS/nixpkgs/blob/nixos-unstable/nixos/modules/virtualisation/qemu-vm.nix     
+  };
+};
+```
+
+Build
+```bash
+nixos-rebuild build-vm --flake .#nixos-test
+```
+
+Run
+```bash
+./result/bin/run-nixos-vm-vm
+```
+
 ## Show changements between revisions
 
 

hosts/nixos-test/default.nix

@@ -30,5 +30,15 @@
     };
   };
 
+  # Configure for testing in vm
+  users.users.florian.initialPassword = "test";
+  virtualisation.vmVariant = {
+    # following configuration is added only when building VM with build-vm
+    virtualisation = {
+      memorySize = 8192; # Use 8192MiB memory.
+      cores = 8;         
+    };
+  };
+
   networking.hostName = "nixos-vm"; # Define your hostname.
 }