OpenBSD node definition and build instructions. (#50)

* OpenBSD node definition and build instructions.

* show pkg_add with cloud-init.  Default to dhcp on em0.

* Update 'Create the VM' section

* Add link to binary

node-definitions/openbsd/OpenBSD.yaml

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+id: OpenBSD
+general:
+  description: OpenBSD Firewall / Router / Server / Host
+  nature: firewall
+  read_only: false
+device:
+  interfaces:
+    has_loopback_zero: true
+    physical:
+      - em0
+      - em1
+      - em2
+      - em3
+      - em4
+      - em5
+      - em6
+      - em7
+    serial_ports: 1
+    default_count: 2
+    loopback:
+      - lo0
+ui:
+  visible: true
+  label_prefix: oBSD-
+  icon: firewall
+  label: OpenBSD
+sim:
+  linux_native:
+    libvirt_domain_driver: kvm
+    driver: server
+    disk_driver: sata
+    ram: 1024
+    cpus: 1
+    nic_driver: e1000
+    cpu_limit: 100
+boot:
+  timeout: 300
+  completed:
+    - 'login:'
+  uses_regex: false
+inherited:
+  image:
+    ram: true
+    cpus: true
+    data_volume: false
+    boot_disk_size: false
+    cpu_limit: true
+  node:
+    ram: true
+    cpus: true
+    data_volume: false
+    boot_disk_size: false
+    cpu_limit: true
+configuration:
+  generator:
+    driver: server
+  provisioning:
+    volume_name: cidata
+    media_type: iso
+    files:
+      - name: meta-data
+        editable: true
+        content: |-
+          instance-id: openbsd
+          local-hostname: openbsd
+      - name: user-data
+        editable: true
+        content: |-
+          #cloud-config
+          # Docs: https://cloudinit.readthedocs.io/en/latest/explanation/about-cloud-config.html
+
+          hostname: openbsd76p1
+
+          write_files:
+          - path: /etc/motd
+            content: |
+              ##########################################################
+              ##  A sample message of the day.                        ##
+              ##########################################################
+      - name: network-config
+        editable: true
+        content: |-
+          #cloud-config
+          # Docs: https://cloudinit.readthedocs.io/en/latest/reference/network-config-format-v1.html
+          network:
+            version: 1
+            config:
+            - type: physical
+              name: em0
+              subnets:
+              - type: dhcp
+      - name: vendor-data
+        editable: true
+schema_version: 0.0.1

node-definitions/openbsd/README.md

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+# OpenBSD-CML
+
+Instructions for building an OpenBSD node in Cisco Modeling Lab
+
+## Why OpenBSD in CML?
+
+OpenBSD is standards-compliant, has good documentation, and is secure.
+
+OpenBSD can act as a router, a routed layer 3 firewall, a NAT boundary, a
+bridging Layer-3 firewall, an end host, a webserver, a load balancer, and many
+other roles not mentioned here.
+
+# Deployable image
+
+A pre-built OpenBSD CML image is available
+[here](https://cml-images.nerdops.io/).
+
+The instructions below were used to create the image.
+
+# Create a qcow2 OpenBSD VM
+
+## Create the VM
+
+Resources required for initially building the VM can differ from the resources
+required for running an instance of that VM in CML.
+
+As resources in CML are generally scarce I suggest starting with a fairly
+minimal configuration while building the VM.  Although it's generally possible
+to increase the resources at runtime it's hard to decrease them.
+
+* RAM: 1GB
+* Disk: 8GB
+* CPU: 1
+* Network: single interface with Internet access (used to install patches and
+  upgrades)
+
+When running an instance of this VM in CML it is possible (and even likely)
+that you will add aditional network interfaces or increase the RAM or Disk
+space.  RAM, Disk, and Network are all easily increased in your CML config.
+
+During the install process OpenBSD will either install a single-CPU kernel or a
+multi-CPU kernel.  If you want to use a multi-CPU kernel you will need to
+create the VM with more than one CPU.  It is possible to change the kernel
+after the fact but it's easier to just create the VM with more than one
+CPU.  As this is a destined for a lab environment I suggest creating the VM
+with only one CPU.
+
+Although I used VMWare to build this image it should be mostly the same to use
+other platforms (VirtualBox, QEMU, KVM, etc).
+
+## Install OpenBSD
+
+I used the amd64
+[install76.iso](https://cdn.openbsd.org/pub/OpenBSD/7.6/amd64/install76.iso)
+image to perform a base install.  I did not install games nor any of the x11
+packages (just to save space).
+
+I used ```cisco``` for the root password.  I disabled root SSH logins out of
+habit.
+
+### Partitioning
+
+Although auto partitioning is sufficient for this, I created a single
+partition in order to both use the entire disk and to avoid the need to create
+a swap partition.
+
+### Users
+
+I created a second user named ```cisco``` with the same password.
+
+## First boot
+
+Once the base system is installed reboot and log in as root.
+
+Right away you should check for updates:
+
+    syspatch
+    pkg_add -u
+
+### Install additional packages
+
+This is an exellent opportunity to install some of the packages that are
+useful for network operations.  Of course, it may be possible to install
+these packages later if your labs have Internet connectivity.
+
+If you intend to use ```cloud-init``` you will need to install git:
+
+    pkg_add git
+
+#### Install now
+
+The benefit of installing packages now is that they will be available
+for use immediately on all instances of the node.  The downsiide is that
+it will occupy more space on the image.
+
+These packages have been extremely useful through the years:
+
+    pkg_add mtr-- wget gnuwatch nmap wireguard-tools
+
+Please note the ```--``` in ```mtr--```.  If ```mtr``` is specified without
+the ```--``` the ```pkg_add``` command will ask the user which version is
+desired; normal MTR or MTR with GTK support.  By using the ```--``` suffix the
+non-GTK version is installed.
+
+#### Install later
+
+If there is Internet connectivity for the instance at runtime it is also
+possible to install these packages later.  This will save space on the image.
+
+To install at runtime, become root on the instance and run the following
+command:
+
+    pkg_add mtr-- wget gnuwatch nmap wireguard-tools
+
+Alternatively, if you are using ```cloud-init``` you can include a
+```packages``` section in your ```user-data``` file.  For example:
+
+```yaml
+#cloud-config
+packages:
+  - mtr--
+  - wget
+  - gnuwatch
+  - nmap
+  - wireguard-tools
+```
+
+### Add username and password hints
+
+If some other admin tries to use your newly minted node it would be nice if
+they can easily see what username and password to use.  This will appear on
+the serial console.
+
+Update the ```/etc/gettytab``` file.  Replace the existing default section with
+this:
+
+    default:\
+            :np:im=\r\n%s/%m (%h) (%t)\r\n\
+    ************************\r\n\
+    * Console login        *\r\n\
+    * username = root      *\r\n\
+    * password = cisco     *\r\n\
+    *                      *\r\n\
+    * General login (SSH)  *\r\n\
+    * username = cisco     *\r\n\
+    * password = cisco     *\r\n\
+    ************************\r\n\
+    \r\n:sp#1200:
+
+### Enable IP forwarding
+
+Enable IP forwarding.  By default this is turned off.  This isn't strictly
+required for an end host nor webserver; but it's a step easily missed.
+
+    echo "net.inet.ip.forwarding=1" > /etc/sysctl.conf
+
+### cloud-init
+
+```cloud-init``` is a tool that allows you to configure a VM on first boot.
+This allows you to configure a VM without having to use the VM's console.
+
+#### Install cloud-init
+
+There is no pre-built ```cloud-init``` package for OpenBSD.  However, it's not
+difficult to install it from source:
+
+    git clone https://github.com/canonical/cloud-init.git
+    cd cloud-init
+    ./tools/build-on-openbsd
+
+If it was successful you should see several ```cloud-init``` commands
+in ```/etc/rc.local```.  These commands will be run on boot.
+
+#### Configure cloud-init
+
+By it's very nature ```cloud-init``` is typically used with a cloud provider
+with access to the Internet.  As the intent here is to build a VM that will run
+inside a CML environment is is necessary to configure ```cloud-init``` to look
+for a local data source.
+
+Edit ```/etc/cloud/cloud.cfg``` and add the following:
+
+    datasource_list: ["NoCloud"]
+    datasource:
+      NoCloud:
+        fs_label: cidata
+
+The configuration above will look for a mounted CDROM with a label of
+```cidata``` during the boot process.  The following files will be read (if
+present):
+
+* ```meta-data```
+* ```user-data```
+* ```network-config```
+* ```vendor-data```
+
+The files above are optional.  Please note that they do not have a file
+extension (there is no ```.yml``` extension).
+
+#### Configure the boot process
+
+By default ```cloud-init``` will populate the ```/etc/rc.local``` file.  The
+```ds-identify``` command will be run by default but is not required since
+the datasource is already configured.  I recommend commenting out this line
+in order to speed up the boot process.
+
+### Enable logins on serial console
+
+Enable serial console to provide a login prompt
+Edit ```/etc/ttys``` so that ```tty00``` reads as:
+
+    tty00   "/usr/libexec/getty std.9600"   vt220   on  secure
+
+This file uses a combination of tabs and spaces.  It will work fine if you only
+use spaces.  Copying and pasting from this README will work fine.
+
+NB: you can output to a serial console without being able to login on it.  This
+step enables that login.
+
+## Snapshot
+
+Now is a good time to create a snapshot of your VM. This point in the install
+it's still fairly easy to install future patches and additional software.
+
+## Finalize the image
+
+These commands will enable output to the serial console needed for CML and
+cleanup the original network interface.  It's hard to undo these (but not
+impossible).
+
+    # remove the network interface config that was created by the installer:
+    rm /etc/hostname.em0
+    # remove the SSH host keys that were generated during the boot:
+    rm /etc/ssh/ssh_host_*
+    # remove the configuration files that cloud-init created:
+    rm -r /var/lib/cloud
+    rm -r /var/run/cloud-init
+    # redirect the default console to the serial console:
+    echo "set tty com0" > /etc/boot.conf
+    # shutdown and power off the VM:
+    shutdown -p now
+
+## Create a clone of the VM
+
+This is the last step before exporting your image to a qcow2 file.
+
+If you attempt to convert the VMWare image to a qcow2 image from the
+snapshotted VMDKs above you will end up with a non-bootable image.  I do not
+understand why.  I suspect it is due to how qemu-img handles snapshots.  For
+best success I recommend you clone your VM to get a flattened VMDK image.  I
+had success with ```Clone to Template...``` in VMWare.
+
+## Convert VM to qcow2
+
+This step is not required if you already have a qcow2 image.  VMWare provides
+a series of VMDK files which need to be converted.
+
+Copy all of the VMDK files from your image to someplace where you can run the
+```qemu-img``` tool (available in Linux).
+
+    qemu-img convert -f vmdk -O qcow2 <base filename.vmdk> <target qcow2 filename>
+
+If you receive an error you may be specifying the wrong base VMDK file.  Look
+for the smallest VMDK file and use it.
+
+Now you can export your qcow2 image for use in CML.
+
+## OpenBSD node definition
+
+An OpenBSD [node definition](OpenBSD.yaml) is include in this directory.