diff --git a/.gitignore b/.gitignore
index b2be92b..87a3018 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 result
+*.qcow2
diff --git a/README.md b/README.md
index 1bc8bd8..adc1931 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,32 @@
-# build
+# Nix app vms
 
-    $ nix-build '<nixpkgs/nixos>' -A config.system.build.isoImage -I nixos-config=chromium.nix
+## Install Nix package manager
 
-# run
+    $ su -c 'mkdir -m 0755 /nix && chown user /nix'
+    $ curl https://nixos.org/nix/install | sh
+
+## Create VM
+
+    $ NIX_PATH=$NIX_PATH:. nix-build '<nixpkgs/nixos>' -A config.system.build.vm -I nixos-config=chromium.nix
+    $ ln -s
+    these derivations will be built:
+      /nix/store/alsxfss45f61015qk0fi147iidl3hj7h-system-path.drv
+      /nix/store/y4r9v7x4wh2pa1slrv0jw97bzax19ssv-dbus-1.drv
+    ...
+    these paths will be fetched (80.31 MiB download, 341.86 MiB unpacked):
+      /nix/store/2bqrxp8j4ax2ka5car249bb8jdnh3rvm-adwaita-icon-theme-3.28.0
+      /nix/store/rrxkl46g4dc8140ykh9i0clswvfqmz1g-chromium-67.0.3396.87-sandbox
+    ...
+    building '/nix/store/sbxmqqi3wmpf9n79a0mncrvb302xwh4n-nixos-vm.drv'...
+    /nix/store/7zgnq9xw9i7ybvjg0d3h2ank5g5nya5p-nixos-vm
+
+## Run application
+
+For last built application (result is a symbolic link):
+
+    $ ./result/bin/run-chromium-vm
+
+Or by full path:
+
+    $ /nix/store/*/bin/run-chromium-vm
 
-   $ qemu-system-x86_64 -smp 2 -m 1024 -enable-kvm -sandbox on -cdrom result/iso/nixos-*-linux.iso
diff --git a/base.nix b/base.nix
new file mode 100644
index 0000000..09ab74f
--- /dev/null
+++ b/base.nix
@@ -0,0 +1,25 @@
+{
+  imports = [
+    <nixpkgs/nixos/modules/virtualisation/qemu-vm.nix>
+  ];
+
+  system.nixos.stateVersion = "18.03";
+
+  services.xserver = {
+    enable = true;
+    desktopManager.xterm.enable = false;
+    displayManager.slim = {
+      enable = true;
+      defaultUser = "user";
+      autoLogin = true;
+    };
+    windowManager.xmonad.enable = true;
+    windowManager.default = "xmonad";
+  };
+
+  users.extraUsers.user = {
+    isNormalUser = true;
+    extraGroups = [ "audio" ];
+    createHome = true;
+  };
+}
diff --git a/chromium-config.nix b/chromium-config.nix
new file mode 100644
index 0000000..c5a5013
--- /dev/null
+++ b/chromium-config.nix
@@ -0,0 +1,5 @@
+{config, ...}:
+{
+  config.networking.hostName = "chromium";
+  config.virtualisation.memorySize = 2048;
+}
diff --git a/chromium.nix b/chromium.nix
index 17d5714..8b0f5a7 100644
--- a/chromium.nix
+++ b/chromium.nix
@@ -1,29 +1,11 @@
-{config, pkgs, ...}:
+{pkgs, ...}:
 {
   imports = [
-    <nixpkgs/nixos/modules/installer/cd-dvd/installation-cd-minimal.nix>
+    <nixpkgs/nixos/modules/virtualisation/qemu-vm.nix>
+    <chromium-config.nix>
+    <base.nix>
   ];
 
-  environment.systemPackages = with pkgs; [
-    chromium
-  ];
-
-  services.xserver = {
-    enable = true;
-    desktopManager.xterm.enable = false;
-    displayManager.slim = {
-      enable = true;
-      defaultUser = "user";
-      autoLogin = true;
-    };
-    displayManager.sessionCommands = "while [ 1 ]; do ${pkgs.chromium}/bin/chromium; done &";
-    windowManager.xmonad.enable = true;
-    windowManager.default = "xmonad";
-  };
-
-  users.extraUsers.user = {
-    isNormalUser = true;
-    extraGroups = [ "audio" ];
-    createHome = true;
-  };
+  environment.systemPackages = [ pkgs.chromium ];
+  services.xserver.displayManager.sessionCommands = "while [ 1 ]; do ${pkgs.chromium}/bin/chromium; done &";
 }