root / pykota / trunk / docs / installation.sgml @ 860

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<chapter>
  <title>Installation</title>
  
  <para>Last modified on $Date$</para>
  
  <para>
    Before being able to use <application>PyKota</application>, you have of course to
    install it first. But before installing, you must carefully plan your installation.
  </para>
  
  <para>
    First you have to determine which machine will be the <application>PyKota</application>
    <firstterm>Storage Server</firstterm>. The Storage Server is the host responsible
    for keeping a centralized database of print usage for all your printers, users and groups.
  </para>
  
  <para>
    Then you have to list all the <firstterm>Print Servers</firstterm> for which
    you plan to use <firstterm>print quota</firstterm> facilities.
  </para>
  
  <para>
    Now we will see what has to be done on these servers.
    <note>
      <title>Note</title>
      <para>
        Of course, depending on the size of your network, you may very well
        use the same machine as both a Print Server and a Storage Server.
        This is especially the case if you've got only one server.
      </para>
    </note>  
  </para>
  
  <sect1>
    <title>Storage Server Installation</title>
    
    <para>
      Depending on <application>PyKota</application>'s version number, different
      types of storage backends may be supported, so we will see for each one of
      them how to configure it.
    </para>
    
    <sect2>
      <title>PostgreSQL</title>
      
      <para>
        <application>PostgreSQL</application> is an <firstterm>Object Relationnal DataBase
        Management System</firstterm> distributed under a <firstterm>Free Software</firstterm>
        license from the 
        <ulink url="http://www.postgresql.org">http://www.postgresql.org</ulink>
        web site. It certainely is the free <acronym>RDBMS</acronym> which has the most advanced
        features, and is widely used all over the world.
      </para>
      
      <para>
        To configure your Storage Server, you must have PostgreSQL already working.
        The complete installation of <application>PostgreSQL</application> is not covered by
        the present manual, please refer to your system's documentation or to 
        <ulink url="http://www.postgresql.org">http://www.postgresql.org</ulink> for
        details.
      </para>
      
      <para>
        One thing you have to check, though, is that every Print Server on which you
        want to install the print quota mechanism, i.e. the print servers, must be able to connect to the
        <application>PostgreSQL</application> server. In the default installation of
        <application>PostgreSQL</application> this may not be the case for security reasons, except if both
        servers are in fact the same machine. In any case, it is recommended that you
        check the <filename>/etc/postgresql/pg_hba.conf</filename> and modify it if
        needed. This file is self documented and its modification is straightforward.
        You also have to make sure that <application>PostgreSQL</application> accepts <acronym>TCP/IP</acronym> connections.
        To do so you either have to launch it with the <option>-i</option> option or
        modify the <filename>/etc/postgresql/postgresql.conf</filename>, which is
        self documented and easy to modify too.
        <tip>
          <title>Tip</title>
          <para>
            Don't forget to restart <application>PostgreSQL</application> if you modify
            any of its configuration files, in order for the changes to take effect.
          </para>
        </tip>  
      </para>
      
      <para>
        Be careful, you may be unable to connect from a Print Server to the <application>PostgreSQL</application>
        server even if the configuration is correct. Sometimes your connections may be blocked by
        one or more network firewalls along the route from one machine to the other. If this
        is the case, then the best thing you can do is to ask your <firstterm>Network Administrator</firstterm>
        to not filter the IP port used by <application>PostgreSQL</application>, which is
        usually port 5432/tcp.
        <note>
          <title>Note</title>
          <para>
            The TCP/IP network port used by PostgreSQL may be different. When in doubt, ask your 
            <firstterm>System Administrator</firstterm> for the correct value. 
          </para>
        </note>  
      </para>
      
      <para>
        Now that your <application>PostgreSQL</application> server is up and running, and
        is waiting for your connections, you have to create the Quota Storage DataBase.
        To do so, you'll have to feed <application>PostgreSQL</application> with the
        <filename>pykota-x.xx/initscripts/pykota-postgresql.sql</filename> file.
        This file will create a Quota DataBase administrator and a Quota DataBase user
        in the <application>PostgreSQL</application> system, then create an empty
        Quota DataBase and set some permissions on it.
      </para>
      
      <para>
        To run this script, you can use the <application>psql</application> frontend to
        <application>PostgreSQL</application>, but your priviledges must be sufficient
        to be allowed to create users and databases. You can launch <application>psql</application>
        as the <literal>postgres</literal> user which is <application>PostgreSQL</application>'s
        default administrator, and connect to the default database named <literal>template1</literal>.
        From a command line interpreter (i.e. shell), type the following commands :
        <screen>
jerome@nordine:~$ cd pykota-1.02-official/initscripts/
jerome@nordine:~/pykota-1.02-official/initscripts$ psql -h localhost -U postgres template1
Welcome to psql, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help on internal slash commands
       \g or terminate with semicolon to execute query
       \q to quit

template1=# \i pykota-postgresql.sql 
            ... a lot of output lines
template1=# \q      
        </screen>
      </para>
      
      <para>
        If no error occured, then your Quota DataBase is ready to be used.
        Now you can let the Quota Storage Server alone, the remaining work
        will have to be done on each one of the print servers which will
        use this particular Quota Storage Server.
        <tip>
          <title>Tip</title>
          <para>
            If an error occured, maybe your PostgreSQL version is too old, or
            an unexpected problem (like a bug) happened. Please send me an email so that I
            can try to solve the problem. Thanks in advance.
          </para>
        </tip>  
      </para>
    </sect2>  
    
    <sect2>
      <title>MySQL</title>
      
      <para>
        A <application>MySQL</application> Storage Backend is planned, but it actually
        doesn't exist.
      </para>
    </sect2>  
    
    <sect2>
      <title>LDAP</title>
      
      <para>
        An <application>LDAP</application> Storage Backend is planned, but it actually
        doesn't exist. Some people may already be working on this, though. 
      </para>
    </sect2>  
    
    <sect2>
      <title>Berkeley DB</title>
      
      <para>
        A <application>Berkeley DB</application> Storage Backend is planned, but it actually
        doesn't exist. It seems that remote storage won't be possible with such a backend,
        so in other terms this means that you will have a different quota database on
        each print server. This may still prove to be useful for small configurations.
      </para>
    </sect2>  
  </sect1>  
  
  <sect1>
    <title>Print Server Installation</title>
    
    <para>
      For each Print Server on which you plan to implement the print quota
      mechanism, you have, of course, to have an already working printing environment. 
      Currently <application>PyKota</application> only works with the
      <ulink url="http://www.cups.org"><application>CUPS</application></ulink> environment,
      but more may be added in the future.
    </para>
    
    <para>
      TODO
    </para>
  </sect1>  
</chapter>

<!--

$Log$
Revision 1.6  2003/03/22 14:06:02  jalet
Quota Storage Server installation is OK for PostgreSQL.

Revision 1.5  2003/03/22 13:11:33  jalet
The port on which the Quota Storage Sever is listening can now
be set in the configuration file (see sample).
Better error handling if PygreSQL is not installed.
Improved documentation.
Version number changed to 1.02alpha

Revision 1.4  2003/03/22 07:20:38  jalet
More information wrt PostgreSQL tcp/ip configuration.

Revision 1.3  2003/03/18 22:18:25  jalet
The documentation will only be a sequence of chapters in a single part, not
multiple parts each including chapters.

Revision 1.2  2003/03/18 22:10:54  jalet
Documentation improvements.

Revision 1.1  2003/02/08 00:03:35  jalet
Documentation skeleton added


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