Servidor de base de dades relacionals.

Actualment el servidor disposa de dos servidors de bases de dades postgres (versió 7.4 i 8.1).

El comportament de PostgreSQL al nostre sistema es pot controlar amb tres fitxers de configuració:

• pg_hba.conf: Aquest fitxer s'utilitza per definir els diferents tipus d'accessos que té un usuari (com, on i des de quin lloc).
• pg_ident.conf: Aquest fitxer s'utilitza per definir la informació necessària en cas que utilitzem un accés del tipus ident a pg_hba.conf.
• postgresql.conf: En aquest fitxer podem canviar tots els paràmetres de configuració que afecten al funcionament i comportament de PostgreSQL a la nostra màquina.

  # Database administrative login by UNIX sockets
  # local    DATABASE    USER                         METHOD     [OPTION]
    local    all         postgres                     trust      # ident sameuser
  
  # TYPE     DATABASE    USER        CIDR-ADDRESS     METHOD     [OPTION]
    local    all         all                          trust      # ident sameuser
    host     all         all         127.0.0.1/32     md5
    host     all         all         ::1/128          md5

Les directives principals ha modificar són:

  #---------------------------------------------------------------------------
  # CONNECTIONS AND AUTHENTICATION
  #---------------------------------------------------------------------------
  port = 5432
  max_connections = 100
  ssl = true

En el cas de dos servidors postgres, com es el nostre cas, s'ha de canvia el número de port d'un d'ells.

• Web oficial de PostgreSQL
• Manuals de PostgreSQL
  • Detailed installation guides
• Practical PostgreSQL, by John Worsley and Joshua Drake, Command Prompt, Inc. Copyright © 2001-2002 by Commandprompt, Inc

És una interficie web en PHP per gestionar les bases de dades PostgreSQL. És accessible a,

• phppgadmin

El primer de tot ens hem d'assegurar que el nostre servidor soporta PHP.

Per començar istalem el paquet phppgadmin al nostres servidor.

Per tindre accés a l'aplicació, es crea un enllaç simbolic a la carpeta del servidor que apunti a la carpeta on es troba el programa.

Ara toca editar la nostra configuració que es troba al fitxer /etc/phppgadmin/config.inc.php i ha de quedar amb el següent contigut:

  <?php
  // ------------------------Servidor PG 7.4-----------------------------------------
    $conf['servers'][0]['desc'] = 'PostgreSQL 7.4';
    $conf['servers'][0]['host'] = 'localhost';
    $conf['servers'][0]['port'] = 5432;
    $conf['servers'][0]['defaultdb'] = 'template1';
    $conf['servers'][0]['pg_dump_path'] = '/usr/bin/pg_dump';
    $conf['servers'][0]['pg_dumpall_path'] = '/usr/bin/pg_dumpall';
    $conf['servers'][0]['slony_support'] = false;
    $conf['servers'][0]['slony_sql'] = '/usr/share/postgresql';
    
  // ------------------------Servidor PG 8.1-----------------------------------------
    $conf['servers'][1]['desc'] = 'PostgreSQL 8.1';
    $conf['servers'][1]['host'] = 'localhost';
    $conf['servers'][1]['port'] = 5433;
    $conf['servers'][1]['defaultdb'] = 'template1';
    $conf['servers'][1]['pg_dump_path'] = '/usr/bin/pg_dump';
    $conf['servers'][1]['pg_dumpall_path'] = '/usr/bin/pg_dumpall';
    $conf['servers'][1]['slony_support'] = false;
    $conf['servers'][1]['slony_sql'] = '/usr/share/postgresql';
    
  // -----------------------General configuration------------------------------------
    $conf['default_lang'] = 'auto';
    $conf['extra_login_security'] = true;
    $conf['owned_only'] = false;
    $conf['show_comments'] = true;
    $conf['show_advanced'] = false;
    $conf['show_system'] = false;
    $conf['show_reports'] = true;
    $conf['owned_reports_only'] = true;
    $conf['min_password_length'] = 1;
    $conf['left_width'] = 200;
    $conf['theme'] = 'default';
    $conf['show_oids'] = false;
    $conf['max_rows'] = 30;
    $conf['max_chars'] = 50;
    $conf['use_xhtml'] = false;
    
    /* ----------------Don't modify anything below this line-------------------- */
    $conf['version'] = 15;
  ?>

En el nostre cas, hi ha dos servidors als quals podem accedir des de l'aplicació. S'ha d'anar en compte amb l'índex del servidor i el número de por que hem assignat a la configuració del servidor.

Si volem que qualsevol usuari que te permisos per utilitzar una base de dades la pugui veure des de l'aplicació, hem de vigilar que el paràmetre owned_only sigui fals.

També cal incloure a les directives a la configuració de l'apache (apache.conf): Allow from localhost

web oficial de PHPpgadmin

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• TeamPostgreSQL allows database administrators to manage their PostgreSQL databases from anywhere.
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