source: main/waeup.aaua/trunk/README.txt @ 11362

Installation of Kofa on Linux production system
###############################################

.. note:: `waeup.kofa` and its custom packages
          might not work with Python > 2.7
          currently. Use of Python 2.7 is recommended.
          The installation is described for Linux-based computers.

Part 1: Deploying Kofa as a single Zope client install
******************************************************

Prerequisites
=============

The Kofa packages are based on `Grok`_, which is a Python
framework for agile webapplication development. Grok itself is based
on `Zope`_.

.. _Grok: http://grok.zope.org/

.. _Zope: http://www.zope.org/

Both, Grok and Zope, are written in Python (with parts written in
C). You therefore need `Python`_ installed.

.. _Python: http://www.python.org/

Note, that you also need the Python header files and a compiler to
compile the parts written in C.

To deploy Kofa most easily, we use `zc.buildout`_

.. _zc.buildout: http://cheeseshop.python.org/pypi/zc.buildout


Preparing the system
====================

To create a working copy of Kofa we recommend use of
`virtualenv`. You, however, need also some basic libraries, a C
compiler and some things more.

What you need (Debian/Ubuntu package names in brackets):

* Python 2.7 (python2.7)

* Python 2.7 development files (python2.7-dev)

* A C-Compiler (gcc)

* The C library development files (libc6-dev)

* A subversion client (svn)

* enscript (enscript) [optional]

  This is only needed if you want test coverage reports.

All these packages can be installed on Debian systems like this::

  # apt-get install python2.7 python2.7-dev python2.7-dbg \
                    gcc libc6-dev svn enscript

Afterwards you should be able to enter::

  $ python2.7

at the commandline and get a Python prompt. Quit the interpreter
pressing <CTRL-D>.


Installing `virtualenv`
=======================

We recommend use of `virtualenv` to create Python sandboxes where you
can run your code without touching any other installations.

If you don't already have ``easy_install`` available, you can find the
script to set it up on the `PEAK EasyInstall page`_.

.. _`PEAK EasyInstall page`: http://peak.telecommunity.com/DevCenter/EasyInstall#installing-easy-install

You need to download `ez_setup.py`_. Then, you run it like this to
install ``easy_install`` into your system Python::

  $ sudo python2.7 ez_setup.py

.. _`ez_setup.py`: http://peak.telecommunity.com/dist/ez_setup.py

This will make ``easy_install`` available to you.

.. note:: Sometimes you have ``easy_install`` installed but you need a
          newer version of the underlying setuptools infrastructure to
          make Grok work. You can upgrade setuptools with::

            $ sudo easy_install -U setuptools

Now you can install `virtualenv` by doing (as root)::

  # easy_install-2.7 virtualenv

This step will fetch all needed sources from the internet and install
`virtualenv` locally in your Python2.7 installation.


Creating a sandbox
==================

This step is only necessary (and recommended) if you installed
`virtualenv` before.

As a normal user you now can create a sandbox for your upcoming work
by::

  $ virtualenv --no-site-packages mysandbox

where ``mysandbox`` is a directory in the filesystem where your
sandbox will be created. `virtualenv` will also create this directory
for you.

By passing the ``no-site-packages`` switch we tell `virtualenv` to
provide us a clean environment without any extra-packages installed
systemwide.

You now can activate the sandbox by doing::

  $ source mysandbox/bin/activate

You will notice that the input prompt changes.

To deactivate the sandbox at any time, enter::

  (sandbox27)$ deactivate

and the prompt will be the same as before the activation.

For the following steps make sure the sandbox is active.


Creating a working place
========================

In the sandbox we now create our real working
environment. To do this, we change to the sandbox and checkout the
sources of Kofa from the subversion server::

  (sandbox27)$ cd mysandbox/
  (sandbox27)$ svn co https://svn.waeup.org/repos/main/waeup.kofa/trunk kofa-trunk

where ``kofa-trunk`` is only a name we've chosen here to make clear
where the sources come from. In this case we are installing the Kofa base
package.

The command should fetch the Kofa base package sources for you and
put it in the directory ``kofa-trunk/``.

Now enter the new directory::

  (sandbox27)$ cd kofa-trunk


Preparing the build
===================

In the sources directory (``kofa-trunk/``) you have to prepare the
project to fetch needed components (eggs), compile C-code parts,
etc. This steip will not touch any external projects::

  (sandbox27)$ python bootstrap.py

This will generate some directories and the ``buildout`` script in
``bin/`` for us. This step must be executed only once for each
instance.

You can now deactivate the sandbox::

  (sandbox27)$ deactivate

Now we can do the real build by triggering::

  $ bin/buildout

If this is your first install of some Grok-related project, this step
will need some time as lots of sources have to be fetched, many
components must be compiled, etc.

This step must be redone whenever you change something in
``buildout.cfg`` or ``setup.py``.

Note that if you have more than one sandbox for a Zope-based web
application, it will probably make sense to share the eggs between the
different sandboxes.  You can tell ``zc.buildout`` to use a central
eggs directory by creating ``~/.buildout/default.cfg`` with the
following contents::

    [buildout]
    eggs-directory = /home/bruno/buildout-eggs


Start the instance
==================

You should be able now to start the created instance by doing::

   $ bin/zopectl fg

Alternatively you can do:

    $ bin/paster serve parts/etc/deploy.ini

The port numbers where Kofa is running on your server are defined in
buildout.cfg under [kofa_params].

If you now point a browser to the right port on your server, for example ::

   localhost:8080

you should get a login pop-up, where you can login as superuser with
``grok`` and ``grok`` as username/password (Kofa base package only!).

You can stop the instance by pressing <CTRL-C>.

If you are connected and logged in,
you should be able to add the grok-based applications
(such as ``University``) from the menu.

Add an instance of ``University`` and click on the link next to the
then visible entry in the list of installed applications.

Running the tests
=================

The tests are easily run by executing the test runner that's
installed in the ``bin`` directory::

    $ bin/test


Part 2: Deploying Kofa as ZEO install
*************************************

Each ZEO install consists of at least one ZEO server and normally two
or more ZEO clients. While the ZEO server is meant to manage the ZODB
database for clients, the clients connect to the outside world, listen
for request and do the real dataprocessing.

We prepared a `buildout` configuration that sets up one server
configuration and two client configs. This configuration is in
``buildout-zeo.cfg``.

Generating the ZEO setup
========================

To install Kofa ZEO-based you can run `buildout` with the given
(or your own) configuration file like this::

  $ ./bin/buildout -c buildout-zeo.cfg

This should generate all scripts necessary to run servers, clients,
etc.

Starting ZEO servers and clients
================================

First start the server::

  $ ./bin/zeo_server start

Clients can be started by doing::

  $ ./bin/zeo_client1 start
  $ ./bin/zeo_client2 start

This will start both clients in daemon mode.

Instead of ``start`` you can, as usually, start an instance in
foreground (``fg``), etc. You know the drill.


Manually starting ZEO clients
=============================

This is normally not neccessary.

``zeo_clientN`` scripts are basically wrappers around calls to
``bin/paster``. You can bypass this wrapper and start a client
'manually' like this::

  $ ./bin/paster serve --pid-file var/zeo1.pid --daemon \
        pars/etc/zeo1.ini

It is important to give a pid-file as paster otherwise can not start
different clients (they would all refer to the same pid file
`paster.pid` and refuse to start after the first client was started).


Setup (paramters, ports, etc.)
==============================

By default the server will listen on port 8100 for requests from
localhost (not: from the outside world).

You can change ZEO server settings in the ``[zeo_server]`` section
of ``buildout-zeo.conf``. Run `buildout` afterwards.

The clients will listen on port 8081 and 8082. You can change settings
in ``etc/zeo1.ini.in`` and ``etc/zeo2.ini.in`` respectively. Run
buildout after any change.

If you want to change the paster wrapper for any zeo client, you can
edit ``etc/zeo1.conf`` and/or ``etc/zeo2.conf``. Run buildout
afterwards.


Creating new clients
====================

You want more clients to be created by buildout? Easy. Three steps are
neccessary.

1. Create config files in etc/
------------------------------

Each client needs two configuration files:

  - ``etc/zeoN.conf``
       configuring the paster wrapper

  - ``etc/zeoN.ini``
       configuring the runtime config, ports, etc.

Just copy over these files from the already existing zeo1/zeo2 files
and replace ``zeo1`` or ``zeo2`` with your new name.

2. Update buildout-zeo.cfg
--------------------------

Here, inside ``buildourt-zeo.cfg`` also three steps are needed.

* 2.1. Create new .ini and .conf entries

  The .conf and .ini files in etc/ are only templates that have to be
  generated in their really used final location. In buildout-zeo.cfg
  you can care for this by creating a new ``[zeoN_ini]`` and
  ``[zeoN_conf]`` option (replacing ``N`` with a number, of course).

  Just copy over existing entries and replace the mentions of ``zeo1``
  or ``zeo2`` by your ``zeoN``.

* 2.2. Create a new ``zeo_clientN`` entry

  Then you have to create an entry that will generate the
  ``zeo_clientN`` script. Again, just copy over an existing
  ``[zeo_client1]`` entry and replace ``1`` withg your client number.

* 2.3. Register the new sections in ``[buildout]`` section

  When done with the above: add the new section in ``[buildout]``::

    [buildout]
      ...
      <old entries...>
      ...
      zope_conf_zeo_5
      zeo5_ini
      zeo_client5

  depending on how you named your new sections.

3. Rerun ``buildout``
---------------------

When adding or removing client/server instances, make sure to stop all
running servers/clients before rerunning buildout.

To activate the new setup, rerun buildout::

  $ bin/buildout -c buildout-zeo.cfg

This should generate any new clients and remove older ones or just
update configuration files.


Considerations
==============

There are some things in the current buildout-zeo.cfg we might do not
want. It extends the regular ``buildout.cfg`` so that we do not have
to repeat most sections but the ``parts`` in ``[buildout]`` have to be
listed.

We need, however, not everything with a ZEO-deploy that is listed in a
default buildout. We might do not need docs, no profiling, etc. Also a
regular non-ZEO kofactl might not make to much sense. Therefore all
this might be subject to changes.