Merge pull request #68 from brianmcgee/fix/vm-forward-example

fix: vm-forward example

Author: Mic92

README.md

@@ -85,13 +85,12 @@ Or switch to qemu console with `Ctrl-a c` and type:
 
 ## Port forwarding
 
-To forward ports from the virtual machine to the host, override the
-`virtualisation.qemu.networkingOptions` NixOS option.
+To forward ports from the virtual machine to the host, use the
+`virtualisation.forwardPorts` NixOS option.
 See `examples/vm-forward.nix` where the ssh server running on port 22 in the
 virtual machine is made accessible through port 2222 on the host.
 
-If `virtualisation.qemu.networkingOptions` is not overridden the same can be
-also achieved by using the `QEMU_NET_OPTS` environment variable.
+The same can be also achieved by using the `QEMU_NET_OPTS` environment variable.
 
 ```console
 $ QEMU_NET_OPTS="hostfwd=tcp::2222-:22" nixos-shell

examples/vm-forward.nix

@@ -1,10 +1,9 @@
 { pkgs, ... }: {
   services.openssh.enable = true;
-  virtualisation.qemu.networkingOptions = [
-    # We need to re-define our usermode network driver
-    # since we are overriding the default value.
-    "-net nic,netdev=user.0,model=virtio"
-    # Than we can use qemu's hostfwd option to forward ports.
-    "-netdev user,id=user.0,hostfwd=tcp::2222-:22"
-  ];
+  virtualisation = {
+    forwardPorts = [
+      { from = "host"; host.port = 2222; guest.port = 22; }
+    ];
+  };
+
 }