diff --git a/devbox/configuration.nix b/devbox/configuration.nix
index af5500d..af82b97 100644
--- a/devbox/configuration.nix
+++ b/devbox/configuration.nix
@@ -1,4 +1,4 @@
-{
+{pkgs, ...}: {
   imports = [
     ../common/aliases
     ../common/nixos
@@ -12,22 +12,237 @@
   # Faster ISO creation
   isoImage.squashfsCompression = "gzip -Xcompression-level 1";
 
+  home-manager.users.ereslibre = {
+    home.file.".ssh/id_rsa" = {
+      source = /Users/ereslibre/.ssh/id_rsa;
+      recursive = true;
+    };
+  };
+
   networking = {
     hostName = "devbox";
     wireless.enable = false;
   };
 
-  services.xserver = {
-    enable = true;
-    desktopManager.gnome.enable = true;
+  services = {
     displayManager = {
-      gdm.enable = true;
-      defaultSession = "gnome";
+      defaultSession = "none+i3";
       autoLogin = {
         enable = true;
         user = "ereslibre";
       };
     };
+    xserver = {
+      enable = true;
+      windowManager.i3 = {
+        enable = true;
+        configFile = pkgs.writeText "i3-config" ''
+          # i3 config file (v4)
+          #
+          # Please see https://i3wm.org/docs/userguide.html for a complete reference!
+          #
+          # This config file uses keycodes (bindsym) and was written for the QWERTY
+          # layout.
+          #
+          # To get a config file with the same key positions, but for your current
+          # layout, use the i3-config-wizard
+          #
+
+          # Font for window titles. Will also be used by the bar unless a different font
+          # is used in the bar {} block below.
+          font pango:monospace 8
+
+          # This font is widely installed, provides lots of unicode glyphs, right-to-left
+          # text rendering and scalability on retina/hidpi displays (thanks to pango).
+          #font pango:DejaVu Sans Mono 8
+
+          # Start XDG autostart .desktop files using dex. See also
+          # https://wiki.archlinux.org/index.php/XDG_Autostart
+          exec --no-startup-id dex --autostart --environment i3
+
+          # The combination of xss-lock, nm-applet and pactl is a popular choice, so
+          # they are included here as an example. Modify as you see fit.
+
+          # xss-lock grabs a logind suspend inhibit lock and will use i3lock to lock the
+          # screen before suspend. Use loginctl lock-session to lock your screen.
+          exec --no-startup-id xss-lock --transfer-sleep-lock -- i3lock --nofork
+
+          # NetworkManager is the most popular way to manage wireless networks on Linux,
+          # and nm-applet is a desktop environment-independent system tray GUI for it.
+          exec --no-startup-id nm-applet
+
+          # Use pactl to adjust volume in PulseAudio.
+          set $refresh_i3status killall -SIGUSR1 i3status
+          bindsym XF86AudioRaiseVolume exec --no-startup-id pactl set-sink-volume @DEFAULT_SINK@ +10% && $refresh_i3status
+          bindsym XF86AudioLowerVolume exec --no-startup-id pactl set-sink-volume @DEFAULT_SINK@ -10% && $refresh_i3status
+          bindsym XF86AudioMute exec --no-startup-id pactl set-sink-mute @DEFAULT_SINK@ toggle && $refresh_i3status
+          bindsym XF86AudioMicMute exec --no-startup-id pactl set-source-mute @DEFAULT_SOURCE@ toggle && $refresh_i3status
+
+          # use these keys for focus, movement, and resize directions when reaching for
+          # the arrows is not convenient
+          set $up l
+          set $down k
+          set $left j
+          set $right semicolon
+
+          # use Mouse+Mod1 to drag floating windows to their wanted position
+          floating_modifier Mod1
+
+          # move tiling windows via drag & drop by left-clicking into the title bar,
+          # or left-clicking anywhere into the window while holding the floating modifier.
+          tiling_drag modifier titlebar
+
+          # start a terminal
+          bindsym Mod1+Return exec i3-sensible-terminal
+
+          # kill focused window
+          bindsym Mod1+Shift+q kill
+
+          # start dmenu (a program launcher)
+          bindsym Mod1+d exec --no-startup-id dmenu_run
+          # A more modern dmenu replacement is rofi:
+          # bindsym Mod1+d exec "rofi -modi drun,run -show drun"
+          # There also is i3-dmenu-desktop which only displays applications shipping a
+          # .desktop file. It is a wrapper around dmenu, so you need that installed.
+          # bindsym Mod1+d exec --no-startup-id i3-dmenu-desktop
+
+          # change focus
+          bindsym Mod1+$left focus left
+          bindsym Mod1+$down focus down
+          bindsym Mod1+$up focus up
+          bindsym Mod1+$right focus right
+
+          # alternatively, you can use the cursor keys:
+          bindsym Mod1+Left focus left
+          bindsym Mod1+Down focus down
+          bindsym Mod1+Up focus up
+          bindsym Mod1+Right focus right
+
+          # move focused window
+          bindsym Mod1+Shift+$left move left
+          bindsym Mod1+Shift+$down move down
+          bindsym Mod1+Shift+$up move up
+          bindsym Mod1+Shift+$right move right
+
+          # alternatively, you can use the cursor keys:
+          bindsym Mod1+Shift+Left move left
+          bindsym Mod1+Shift+Down move down
+          bindsym Mod1+Shift+Up move up
+          bindsym Mod1+Shift+Right move right
+
+          # split in horizontal orientation
+          bindsym Mod1+h split h
+
+          # split in vertical orientation
+          bindsym Mod1+v split v
+
+          # enter fullscreen mode for the focused container
+          bindsym Mod1+f fullscreen toggle
+
+          # change container layout (stacked, tabbed, toggle split)
+          bindsym Mod1+s layout stacking
+          bindsym Mod1+w layout tabbed
+          bindsym Mod1+e layout toggle split
+
+          # toggle tiling / floating
+          bindsym Mod1+Shift+space floating toggle
+
+          # change focus between tiling / floating windows
+          bindsym Mod1+space focus mode_toggle
+
+          # focus the parent container
+          bindsym Mod1+a focus parent
+
+          # focus the child container
+          #bindsym Mod1+d focus child
+
+          # move the currently focused window to the scratchpad
+          bindsym Mod1+Shift+minus move scratchpad
+
+          # Show the next scratchpad window or hide the focused scratchpad window.
+          # If there are multiple scratchpad windows, this command cycles through them.
+          bindsym Mod1+minus scratchpad show
+
+          # Define names for default workspaces for which we configure key bindings later on.
+          # We use variables to avoid repeating the names in multiple places.
+          set $ws1 "1"
+          set $ws2 "2"
+          set $ws3 "3"
+          set $ws4 "4"
+          set $ws5 "5"
+          set $ws6 "6"
+          set $ws7 "7"
+          set $ws8 "8"
+          set $ws9 "9"
+          set $ws10 "10"
+
+          # switch to workspace
+          bindsym Mod1+1 workspace number $ws1
+          bindsym Mod1+2 workspace number $ws2
+          bindsym Mod1+3 workspace number $ws3
+          bindsym Mod1+4 workspace number $ws4
+          bindsym Mod1+5 workspace number $ws5
+          bindsym Mod1+6 workspace number $ws6
+          bindsym Mod1+7 workspace number $ws7
+          bindsym Mod1+8 workspace number $ws8
+          bindsym Mod1+9 workspace number $ws9
+          bindsym Mod1+0 workspace number $ws10
+
+          # move focused container to workspace
+          bindsym Mod1+Shift+1 move container to workspace number $ws1
+          bindsym Mod1+Shift+2 move container to workspace number $ws2
+          bindsym Mod1+Shift+3 move container to workspace number $ws3
+          bindsym Mod1+Shift+4 move container to workspace number $ws4
+          bindsym Mod1+Shift+5 move container to workspace number $ws5
+          bindsym Mod1+Shift+6 move container to workspace number $ws6
+          bindsym Mod1+Shift+7 move container to workspace number $ws7
+          bindsym Mod1+Shift+8 move container to workspace number $ws8
+          bindsym Mod1+Shift+9 move container to workspace number $ws9
+          bindsym Mod1+Shift+0 move container to workspace number $ws10
+
+          # reload the configuration file
+          bindsym Mod1+Shift+c reload
+          # restart i3 inplace (preserves your layout/session, can be used to upgrade i3)
+          bindsym Mod1+Shift+r restart
+          # exit i3 (logs you out of your X session)
+          bindsym Mod1+Shift+e exec "i3-nagbar -t warning -m 'You pressed the exit shortcut. Do you really want to exit i3? This will end your X session.' -B 'Yes, exit i3' 'i3-msg exit'"
+
+          # resize window (you can also use the mouse for that)
+          mode "resize" {
+                  # These bindings trigger as soon as you enter the resize mode
+
+                  # Pressing left will shrink the window’s width.
+                  # Pressing right will grow the window’s width.
+                  # Pressing up will shrink the window’s height.
+                  # Pressing down will grow the window’s height.
+                  bindsym $left       resize shrink width 10 px or 10 ppt
+                  bindsym $down       resize grow height 10 px or 10 ppt
+                  bindsym $up         resize shrink height 10 px or 10 ppt
+                  bindsym $right      resize grow width 10 px or 10 ppt
+
+                  # same bindings, but for the arrow keys
+                  bindsym Left        resize shrink width 10 px or 10 ppt
+                  bindsym Down        resize grow height 10 px or 10 ppt
+                  bindsym Up          resize shrink height 10 px or 10 ppt
+                  bindsym Right       resize grow width 10 px or 10 ppt
+
+                  # back to normal: Enter or Escape or Mod1+r
+                  bindsym Return mode "default"
+                  bindsym Escape mode "default"
+                  bindsym Mod1+r mode "default"
+          }
+
+          bindsym Mod1+r mode "resize"
+
+          # Start i3bar to display a workspace bar (plus the system information i3status
+          # finds out, if available)
+          bar {
+                  status_command i3status
+          }
+        '';
+      };
+      displayManager.lightdm.enable = true;
+    };
   };
 
   # This value determines the NixOS release from which the default
diff --git a/justfile b/justfile
index d7160a5..b707e50 100644
--- a/justfile
+++ b/justfile
@@ -7,7 +7,7 @@ build host=defaultHost:
   nix build .#nixosConfigurations.{{host}}.config.system.build.toplevel
 
 build-iso host=defaultHost:
-  nix build .#nixosConfigurations.{{host}}.config.system.build.isoImage
+  nix build --impure .#nixosConfigurations.{{host}}.config.system.build.isoImage
 
 fmt:
   find . -name "*.nix" | xargs nix develop --command alejandra
diff --git a/rafaels-air/configuration.nix b/rafaels-air/configuration.nix
index 3289ac0..7618345 100644
--- a/rafaels-air/configuration.nix
+++ b/rafaels-air/configuration.nix
@@ -1,4 +1,8 @@
-{pkgs, ...}: {
+{
+  pkgs,
+  lib,
+  ...
+}: {
   imports = [
     ../common/nixos
   ];
@@ -31,7 +35,16 @@
 
   nix = {
     gc.automatic = true;
-    linux-builder.enable = true;
+    linux-builder = {
+      enable = true;
+      ephemeral = true;
+      config = {
+        virtualisation = {
+          diskSize = lib.mkForce (1000 * 1024);
+        };
+      };
+    };
+    settings.trusted-users = ["@admin"];
   };
 
   services = {