PostgreSQL Reference Manual - Volume 2 - Programming Guide by The PostgreSQL Global Development Group Paperback (6"x9"), 408 pages ISBN 0954612035 RRP £19.95 ($34.95) Sales of this book support the PostgreSQL project! Get a printed copy>>>

PostgreSQL Reference Manual Volume 2 Buy the book here! >>> only $34.95

1.15 LDAP Lookup of Connection Parameters

If libpq has been compiled with LDAP support (option --with-ldap for configure) it is possible to retrieve connection options like host or dbname 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.

LDAP connection parameter lookup uses the connection service file ‘pg_service.conf’ (see section 1.14 The Connection Service File). A line in a ‘pg_service.conf’ stanza that starts with ldap:// will be recognized as an LDAP URL and an LDAP query will be performed. The result must be a list of keyword = value pairs which will be used to set connection options. The URL must conform to RFC 1959 and be of the form

ldap://[hostname[:port]]/search_base?attribute?search_scope?
filter

where hostname defaults to localhost and port defaults to 389.

Processing of ‘pg_service.conf’ 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 keyword = value 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.

A sample LDAP entry that has been created with the LDIF file

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

might be queried with the following LDAP URL:

ldap://ldap.mycompany.com/dc=mycompany,dc=com?uniqueMember?
one?(cn=mydatabase)