Add virt-manager instructions

Author: arbrandes

DEVSTACK_VM_SETUP_LINUX.md

@@ -4,7 +4,12 @@ Example using 8GB of RAM and 8 CPU cores:
 $ qemu-system-x86_64 -m 8096 -enable-kvm -smp 8 -netdev user,id=mynet.0,hostfwd=tcp::18000-:18000,hostfwd=tcp::18010-:18010 -device virtio-net-pci,netdev=mynet.0 -hda devstack-bullseye.qcow2
 ```
 
+If this doesn't work for you, consider the following options.
+
 # GNOME Boxes
+
+If you're in a GNOME environment, you can either use [Boxes](https://wiki.gnome.org/Apps/Boxes) or [virt-manager](https://virt-manager.org/).  Both should be installable via your package manager of choice.
+
 ## Create the VM in Boxes
 ### Create a new VM from file
 ![create vm](media/boxes_create_vm.png)
@@ -15,8 +20,57 @@ $ qemu-system-x86_64 -m 8096 -enable-kvm -smp 8 -netdev user,id=mynet.0,hostfwd=
 ### Select 8+ GB of ram, create VM
 ![create vm](media/boxes_add_ram.png)
 
+## Create the VM in virt-manager
+
+Alternatively, you can create the VM in virt-manager.  Open it up, click on new VM, and choose `Import existing disk image`.
+
+![create vm](media/virtmanager_create_vm.png)
+
+Then, browse to the location where you extracted from the zip file, and select it:
+
+![import_image](media/virtmanager_import_image.png)
+
+Now select "Debian 11" as the OS:
+
+![select os](media/virtmanager_select_os.png)
+
+Give the VM 8192 MiB or more of RAM and at least 2 CPU cores.  16384 MiB and 4 cores are recommended, if you have the hardware to spare.
+
+![hardware](media/virtmanager_hardware.png)
+
+Review settings and click "Finish."
+
+![review settings](media/virtmanager_review_settings.png)
+
+After a short while, a terminal window will pop up showing the operating system boot process.
+
+![booted](media/virtmanager_booted.png)
+
 ## Set up port forwarding
-### Find your VM with `virsh`
+
+There are two ways to do port forwarding.  We'll start with the simplest one, using SSH.
+
+### SSH port forwarding
+
+First, find the IP of your VM:
+
+```bash
+$ virsh net-dhcp-leases default
+ Expiry Time           MAC address         Protocol   IP address          Hostname            Client ID or DUID
+------------------------------------------------------------------------------------------------------------------...
+ 2023-03-27 18:27:25   52:54:00:91:92:02   ipv4       192.168.122.77/24   devstack-bullseye   ff:00:91:92:02:00:01...
+```
+In this example, the IP address is `192.168.122.77`.  In your case, it will be different.  SSH into it using the following command, substituting `192.168.122.77` with the IP address you obtained above.  The password is `devstack`.
+
+```
+$ ssh -L 18000:localhost:18000 -L 18010:localhost:18010 devstack@192.168.122.77
+```
+
+### QEMU port forwarding
+
+One can also use QEMU's [native port forwarding](https://wiki.archlinux.org/title/QEMU#QEMU's_port_forwarding) if SSH is not desirable.
+
+#### Find your VM with `virsh`
 
 `virsh list` or `virsh -c qemu:///session list --all`
 
@@ -34,7 +88,7 @@ $ virsh -c qemu:///session list --all
  3    debian11        running
 ```
 
-### Edit your VM config using `virsh`
+#### Edit your VM config using `virsh`
 
 ```
 $ virsh edit debian11
@@ -59,7 +113,3 @@ add command line stuff to the end
     <qemu:arg value='virtio-net-pci,netdev=mynet.0,bus=pcie.0,addr=0x3'/>
   </qemu:commandline>
 ```
-
-# `virt-manager`
-[virt-manager](https://virt-manager.org/) is another GUI based option for Linux. Make sure ports `18000` and `18010` are forwarded.
-