Procedure to create DevStack disk image
=======================================

Create the DevStack disk image
------------------------------

1. Create a new Fedora-21 disk image that will be our DevStack virtual
   machine:


    $ virt-builder fedora-21 -o devstack --update \
        --format qcow2 --selinux-relabel --size 8G


2. Import the disk image into libvirt (and getaccess to a serial
   console):

    $ virt-install --name devstack --ram 4096 \
        --disk path=/home/kashyapc/devstack,format=qcow2 --import \
        --os-variant=fedora21

    $ virsh console devstack


Setting up DevStack environment
-------------------------------

(1) We'll install DevStack under: $HOME/src/cloud, create that env:

    $ mkdir -p $HOME/src/cloud
    $ cd $HOME/src/cloud
    $ chmod go+rx $HOME

    Install git:

    $ yum install git -y


(2) Create a user, and give sudo permissions:

    $ useradd tuser1
    $ passwd  (#secret)

    $ visudo 
    [. . .]

    $ grep tuser /etc/sudoers
    tuser1          ALL=(ALL)       NOPASSWD: ALL


(3) Clone DevStack project, create a local.conf file and invoke the
    install script:

    $ git clone https://git.openstack.org/openstack-dev/devstack
    $ cd devstack
    
    # The local.conf file is provided in the root directory
    $ cp ../local.conf .
    
    $ ./stack.sh


Enable some services inside DevStack VM to make them persistent:
---------------------------------------------------------------
    $ sudo systemctl enable mariadb
    $ sudo systemctl enable rabbitmq-server
    $ sudo systemctl enable httpd
    $ sudo systemctl enable openvswitch


Sparsifying and compressing the image
-------------------------------------

    $ virt-sysprep -a devstack-advent
    $ virt-sparsify devstack-advent devstack-advent.sparse
    $ xz -v --best devstack-advent.sparse

To decompress:

    xz -v --decompress devstack-advent.sparse.xz