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+=================================================================================================
+OPNFV Build instruction for the Brahmaputra release of OPNFV when using Fuel as a deployment tool
+=================================================================================================
+
+License
+=======
+
+This work is licensed under a Creative Commons Attribution 4.0
+International License. .. http://creativecommons.org/licenses/by/4.0 ..
+(c) Jonas Bjurel (Ericsson AB) and others
+
+Abstract
+========
+
+This document describes how to build the Fuel deployment tool for the
+Brahmaputra release of OPNFV build system, dependencies and required
+system resources.
+
+Introduction
+============
+
+This document describes the build system used to build the Fuel
+deployment tool for the Brahmaputra release of OPNFV, required
+dependencies and minimum requirements on the host to be used for the
+build system.
+
+The Fuel build system is designed around Docker containers such that
+dependencies outside of the build system can be kept to a minimum. It
+also shields the host from any potential dangerous operations
+performed by the build system.
+
+The audience of this document is assumed to have good knowledge in
+network and Unix/Linux administration.
+
+Requirements
+============
+
+Minimum Hardware Requirements
+-----------------------------
+
+- ~30 GB available disc
+
+- 4 GB RAM
+
+Minimum Software Requirements
+-----------------------------
+
+The build host should run Ubuntu 14.04 operating system.
+
+On the host, the following packages must be installed:
+
+- An x86_64 host (Bare-metal or VM) with Ubuntu 14.04 LTS installed
+
+  - A kernel equal- or later than 3.19 (Vivid) (simply available through sudo apt-get install linux-generic-lts-vivid)
+
+  - **Note:** Builds on Wily (Ubuntu 15.x) are currently not supported
+
+- docker - see https://docs.docker.com/engine/installation/ubuntulinux/ for installation notes for Ubuntu 14.04. Tested against version 1.9.x and greater
+
+- git (simply available through $ sudo apt-get install git)
+
+- make (simply available through $ sudo apt-get install make)
+
+- curl (simply available through $ sudo apt-get install curl)
+
+Preparations
+============
+
+Setting up the Docker build container
+-------------------------------------
+After having installed Docker, add yourself to the docker group:
+
+$ sudo usermod -a -G docker [userid]
+
+Also make sure to define relevant DNS servers part of the global
+DNS chain in your </etc/default/docker> configuration file.
+Uncomment, and modify the values appropriately.
+
+For example:
+
+<DOCKER_OPTS=" --dns=8.8.8.8 --dns=8.8.8.4">
+
+Then restart docker:
+
+.. code-block:: console
+
+    $ sudo service docker restart
+
+Setting up OPNFV Gerrit in order to being able to clone the code
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+- Start setting up OPNFV gerrit by creating a SSH key (unless you
+  don't already have one), create one with ssh-keygen
+
+- Add your generated public key in OPNFV Gerrit <https://gerrit.opnfv.org/>
+  (this requires a Linux foundation account, create one if you do not
+  already have one)
+
+- Select "SSH Public Keys" to the left and then "Add Key" and paste
+  your public key in.
+
+Clone the OPNFV code Git repository with your SSH key
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Now it is time to clone the code repository:
+
+$ git clone ssh://<Linux foundation user>@gerrit.opnfv.org:29418/fuel
+
+Now you should have the OPNFV fuel repository with the Fuel
+directories stored locally on your build host.
+
+Check out the Brahmaputra release:
+$ cd fuel
+$ git checkout brahmaputra.1.0
+
+Clone the OPNFV code Git repository without a SSH key
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+You can also opt to clone the code repository without a SSH key:
+
+$ git clone https://gerrit.opnfv.org:29418/gerrit/fuel
+
+Make sure to checkout the release tag as described above.
+
+Support for building behind a http/https/rsync proxy
+----------------------------------------------------
+
+The build system is able to make use of a web proxy setup if the
+http_proxy, https_proxy, no_proxy (if needed) and RSYNC_PROXY or
+RSYNC_CONNECT_PROG environment variables have been set before invoking make.
+
+The proxy setup must permit port 80 (http), 443 (https) and 873
+(rsync).
+
+Important note about the host Docker daemon settings
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The Docker daemon on the host must be configured to use the http proxy
+for it to be able to pull the base Ubuntu 14.04 image from the Docker
+registry before invoking make! In Ubuntu this is done by adding a line
+like:
+
+export http_proxy="http://10.0.0.1:8888/"
+
+to /etc/default/docker and restarting the Docker daemon.
+
+Setting proxy environment variables prior to build
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The build system will make use the following environment variables
+that needs to be exported to subshells by using export (bash) or
+setenv (csh/tcsh).
+
+| http_proxy (or HTTP_PROXY)
+| https_proxy (or HTTP_PROXY)
+| no_proxy (or NO_PROXY)
+| RSYNC_PROXY
+| RSYNC_CONNECT_PROG
+
+As an example, these are the settings that were put in the user's
+.bashrc when verifying the proxy build functionality:
+
+| export RSYNC_PROXY=10.0.0.1:8888
+| export http_proxy=http://10.0.0.1:8888
+| export https_proxy=http://10.0.0.1:8888
+| export no_proxy=localhost,127.0.0.1,.consultron.com,.sock
+
+Using a ssh proxy for the rsync connection
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If the proxy setup is not allowing the rsync protocol, an alternative
+solution is to use a SSH tunnel to a machine capable of accessing the
+outbound port 873. Set the RSYNC_CONNECT_PROG according to the rsync
+manual page (for example to "ssh <username>@<hostname> nc %H 873")
+to enable this. Also note that netcat needs to be installed on the
+remote system!
+
+Make sure that the ssh command also refers to the user on the remote
+system, as the command itself will be run from the Docker build container
+as the root user (but with the invoking user's SSH keys).
+
+Disabling the Ubuntu repo cache if rsync is not allowed
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+During the build phase, a local Ubuntu package repository is fetched
+from upstream in order to be added to the OPNFV Fuel ISO and for parts
+of this process rsync is used.
+
+If neither of the two available methods for proxying rsync are
+available, the last resort is to turn off the caching of the Ubuntu
+packages in the build system. This is done by removing the
+"f_repobuild" from SUBDIRS in the beginning of
+the fuel/build/f_isoroot/Makefile.
+
+Note! Doing this will require the Fuel master node to have Internet
+access when installing the ISO artifact built as no Ubuntu package
+cache will be on the ISO!
+
+Configure your build environment
+--------------------------------
+
+** Configuring the build environment should not be performed if building
+standard Brahmaputra release **
+
+Select the versions of the components you want to build by editing the
+fuel/build/config.mk file.
+
+Non official build: Selecting which plugins to build
+----------------------------------------------------
+In order to cut the build time for unofficial builds (made by an
+individual developer locally), the selection if which Fuel plugins to
+build (if any) can be done by environment variable
+"BUILD_FUEL_PLUGINS" prior to building.
+
+Only the plugin targets from fuel/build/f_isoroot/Makefile that are
+specified in the environment variable will then be built. In order to
+completely disable the building of plugins, the environment variable
+is set to " ". When using this functionality, the resulting iso file
+will be prepended with the prefix "unofficial-" to clearly indicate
+that this is not a full build.
+
+This method of plugin selection is not meant to be used from within
+Gerrit!
+
+Building
+========
+
+There are two methods available for building Fuel:
+
+- A low level method using Make
+
+- An abstracted method using build.sh
+
+Low level build method using make
+---------------------------------
+The low level method is based on Make:
+
+From the <fuel/build> directory, invoke <make [target]>
+
+Following targets exist:
+
+- none/all -  this will:
+
+  - Initialize the docker build environment
+
+  - Build Fuel from upstream (as defined by fuel-build/config-spec)
+
+  - Build the OPNFV defined plugins/features from upstream
+
+  - Build the defined additions to fuel (as defined by the structure
+    of this framework)
+
+  - Apply changes and patches to fuel (as defined by the structure of
+    this framework)
+
+  - Reconstruct a fuel .iso image
+
+- clean - this will remove all artifacts from earlier builds.
+
+- debug - this will simply enter the build container without starting a build, from here you can start a build by enter "make iso"
+
+If the build is successful, you will find the generated ISO file in
+the <fuel/build/release> subdirectory!
+
+Abstracted build method using build.sh
+--------------------------------------
+The abstracted build method uses the <fuel/ci/build.sh> script which
+allows you to:
+
+- Create and use a build cache - significantly speeding up the
+  build time if upstream repositories have not changed.
+
+- push/pull cache and artifacts to an arbitrary URI (http(s):, file:, ftp:)
+
+For more info type <fuel/ci/build.sh -h>.
+
+Artifacts
+=========
+
+The artifacts produced are:
+
+- <OPNFV_XXXX.iso> - Which represents the bootable Fuel image, XXXX is
+  replaced with the build identity provided to the build system
+
+- <OPNFV_XXXX.iso.txt> - Which holds version metadata.
+
+References
+==========
+
+1) OPNFV Installation instruction for the Brahmaputra release of OPNFV when using Fuel as a deployment tool
+
+2) OPNFV Build instruction for the Brahmaputra release of OPNFV when using Fuel as a deployment tool
+
+3) OPNFV Release Note for the Brahmaputra release of OPNFV when using Fuel as a deployment tool