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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >LDAP Lookup of Connection Parameters</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 9.2.24 Documentation" HREF="index.html"><LINK REL="UP" TITLE="libpq - C Library" HREF="libpq.html"><LINK REL="PREVIOUS" TITLE="The Connection Service File" HREF="libpq-pgservice.html"><LINK REL="NEXT" TITLE="SSL Support" HREF="libpq-ssl.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2017-11-06T22:43:11"></HEAD ><BODY CLASS="SECT1" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" ><A HREF="index.html" >PostgreSQL 9.2.24 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="The Connection Service File" HREF="libpq-pgservice.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="libpq.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" >Chapter 31. <SPAN CLASS="APPLICATION" >libpq</SPAN > - C Library</TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="SSL Support" HREF="libpq-ssl.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="LIBPQ-LDAP" >31.17. LDAP Lookup of Connection Parameters</A ></H1 ><P > If <SPAN CLASS="APPLICATION" >libpq</SPAN > has been compiled with LDAP support (option <TT CLASS="LITERAL" ><TT CLASS="OPTION" >--with-ldap</TT ></TT > for <TT CLASS="COMMAND" >configure</TT >) it is possible to retrieve connection options like <TT CLASS="LITERAL" >host</TT > or <TT CLASS="LITERAL" >dbname</TT > via LDAP from a central server. The advantage is that if the connection parameters for a database change, the connection information doesn't have to be updated on all client machines. </P ><P > LDAP connection parameter lookup uses the connection service file <TT CLASS="FILENAME" >pg_service.conf</TT > (see <A HREF="libpq-pgservice.html" >Section 31.16</A >). A line in a <TT CLASS="FILENAME" >pg_service.conf</TT > stanza that starts with <TT CLASS="LITERAL" >ldap://</TT > will be recognized as an LDAP URL and an LDAP query will be performed. The result must be a list of <TT CLASS="LITERAL" >keyword = value</TT > pairs which will be used to set connection options. The URL must conform to RFC 1959 and be of the form </P><PRE CLASS="SYNOPSIS" >ldap://[<TT CLASS="REPLACEABLE" ><I >hostname</I ></TT >[:<TT CLASS="REPLACEABLE" ><I >port</I ></TT >]]/<TT CLASS="REPLACEABLE" ><I >search_base</I ></TT >?<TT CLASS="REPLACEABLE" ><I >attribute</I ></TT >?<TT CLASS="REPLACEABLE" ><I >search_scope</I ></TT >?<TT CLASS="REPLACEABLE" ><I >filter</I ></TT ></PRE ><P> where <TT CLASS="REPLACEABLE" ><I >hostname</I ></TT > defaults to <TT CLASS="LITERAL" >localhost</TT > and <TT CLASS="REPLACEABLE" ><I >port</I ></TT > defaults to 389. </P ><P > Processing of <TT CLASS="FILENAME" >pg_service.conf</TT > is terminated after a successful LDAP lookup, but is continued if the LDAP server cannot be contacted. This is to provide a fallback with further LDAP URL lines that point to different LDAP servers, classical <TT CLASS="LITERAL" >keyword = value</TT > pairs, or default connection options. If you would rather get an error message in this case, add a syntactically incorrect line after the LDAP URL. </P ><P > A sample LDAP entry that has been created with the LDIF file </P><PRE CLASS="PROGRAMLISTING" >version:1 dn:cn=mydatabase,dc=mycompany,dc=com changetype:add objectclass:top objectclass:groupOfUniqueNames cn:mydatabase uniqueMember:host=dbserver.mycompany.com uniqueMember:port=5439 uniqueMember:dbname=mydb uniqueMember:user=mydb_user uniqueMember:sslmode=require</PRE ><P> might be queried with the following LDAP URL: </P><PRE CLASS="PROGRAMLISTING" >ldap://ldap.mycompany.com/dc=mycompany,dc=com?uniqueMember?one?(cn=mydatabase)</PRE ><P> </P ><P > You can also mix regular service file entries with LDAP lookups. A complete example for a stanza in <TT CLASS="FILENAME" >pg_service.conf</TT > would be: </P><PRE CLASS="PROGRAMLISTING" ># only host and port are stored in LDAP, specify dbname and user explicitly [customerdb] dbname=customer user=appuser ldap://ldap.acme.com/cn=dbserver,cn=hosts?pgconnectinfo?base?(objectclass=*)</PRE ><P> </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="libpq-pgservice.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="libpq-ssl.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >The Connection Service File</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="libpq.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >SSL Support</TD ></TR ></TABLE ></DIV ></BODY ></HTML >