Update IPA info in troubleshooting.rst

The details on IPA image options were not previously detailed in
the troubleshooting documentation, and given that we have switched
from CoreOS to TinyIPA for testing, it is relevent to suppliment the
troubleshooting information. Updated formatting and placement in
an attempt to provide better clarity to the reader or user attempting
to remedy an issue.

Change-Id: Ic2f4acd8c4824ddc4c13dabec7d6b8cfb413b35b

troubleshooting.rst

@@ -34,12 +34,9 @@ Example error::
     NodeLocked: Node 00000000-0000-0000-0000-046ebb96ec21 is locked by
     host $HOSTNAME, please retry after the current operation is completed.
 
-*********************************************
-Unexpected/Unknown failure with the IPA Agent
-*********************************************
-
-New image appears not to be deploying
-=====================================
+*****************************************************
+New image appears not to be deploying upon deployment
+*****************************************************
 
 When deploying a new image with the same previous name, it is necessary to
 purge the contents of the TFTP master_images folder which caches the image
@@ -50,8 +47,9 @@ Additionally, a playbook has been included that can be used prior to a
 re-installation to ensure fresh images are deployed.  This playbook can
 be found at ``playbooks/cleanup-deployment-images.yaml``.
 
+*********************
 Building an IPA image
-=====================
+*********************
 
 Troubleshooting issues involving IPA can be time consuming.  The IPA
 developers **HIGHLY** recommend that users build their own custom IPA
@@ -59,8 +57,23 @@ images in order to inject things such as SSH keys, and turn on agent
 debugging which must be done in a custom image as there is no mechanism
 to enable debugging via the kernel command line at present.
 
-IPA's instructions on building a custom image can be found at:
-http://git.openstack.org/cgit/openstack/ironic-python-agent/tree/imagebuild/coreos/README.rst
+Custom IPA images can be built a number of ways, the most generally useful
+mechanism is with diskimage-builder as the distributions typically have
+better hardware support than CoreOS and Tiny Core Linux. However, CoreOS
+and Tiny Core based images are what are used by the OpenStack CI for
+ironic tests.
+
+CoreOS::
+  http://git.openstack.org/cgit/openstack/ironic-python-agent/tree/imagebuild/coreos/README.rst
+TinyIPA::
+  https://git.openstack.org/cgit/openstack/ironic-python-agent/tree/imagebuild/tinyipa/README.rst
+
+For documentation on diskimage-builder, See::
+  http://docs.openstack.org/developer/diskimage-builder/.
+
+It should be noted that the steps for diskimage-builder installation and
+use to create an IPA image for Bifrost are the same as for ironic. See::
+  http://docs.openstack.org/developer/ironic/deploy/install-guide.html#image-requirements
 
 This essentially boils down to the following steps:
 
@@ -82,6 +95,14 @@ Since you have updated the image to be deployed, you will need to purge the
 contents of /tftpboot/master_images for the new image to be utilized for the
 deployment process.
 
+*********************************************
+Unexpected/Unknown failure with the IPA Agent
+*********************************************
+
+Many failures due to the IPA agent can be addressed by building a custom
+IPA Image.  See `Building an IPA image`_ for information on building
+your own IPA image.
+
 Obtaining IPA logs via the console
 ==================================
 
@@ -95,7 +116,7 @@ Obtaining IPA logs via the console
    Parameters will vary by your hardware type and configuration,
    however the ``systemd.journald.forward_to_console=yes`` setting is
    a default, and will only work for systemd based IPA images such as
-   the default CoreOS image.
+   the CoreOS image.
 
    The example above, effectively disables all attempts by the kernel to set
    the video mode, defines the console as ttyS0 or the first serial port, and
@@ -168,3 +189,28 @@ Example::
 
 NOTE: The matching private key will need to be utilized to login to the
 machine deployed.
+
+***********************************************************
+Changing from TinyIPA to CoreOS IPA, or any other IPA Image
+***********************************************************
+
+With-in the Newton cycle, the default IPA image for Bifrost was changed
+to TinyIPA, which is based on Tiny Core Linux. This has a greately reduced
+boot time for testing, however should be expected to have less hardware
+support. If on a fresh install, or a re-install, you wish to change to CoreOS
+or any other IPA image, you will need to take the following steps:
+
+#. Remove the existing IPA image ipa.vmlinuz and ipa.initramfs.
+#. Edit the ``playbooks/roles/bifrost-ironic-install/defaults/main.yml``
+   file and update the ``ipa_kernel_upstream_url`` and
+   ``ipa_kernel_upstream_url`` settings to a new URL.
+   For CoreOS, these urls would be,
+   ``https://tarballs.openstack.org/ironic-python-agent/coreos/files/coreos_production_pxe.vmlinuz``
+   and
+   ``https://tarballs.openstack.org/ironic-python-agent/coreos/files/coreos_production_pxe_image-oem.cpio.gz``
+   respectively.
+#. Execute the installation playbook, and the set files will be automatically
+   downloaded again. If the files are not removed prior to (re)installation,
+   then they will not be replaced. Alternatively, the files can just be directly
+   replaced on disk. The default where the kernel and ramdisk are located is in
+   ``/httboot/``.