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DB(7P)									DB(7P)

NAME    [Toc]    [Back]

     db	- local	name service database

SYNOPSIS    [Toc]    [Back]


DESCRIPTION    [Toc]    [Back]

     The db client library fetches name	service	data out of an db(3B) format
     database file on the local	host.  This library is meant to	be used	only
     by	the nsd(1M) daemon to efficiently access local name service data.

     The library /var/ns/lib/libns_db.so is opened by the nsd(1M) daemon when
     db	is listed as the protocol for some map in a nsswitch.conf file.

     The library contains code to fetch	data from a local db file and present
     it	as lines from the configuration	file from which	it came.  The nsd
     daemon then presents that data in the filesystem mounted under /ns.

     Extended attributes in the	nsswitch.conf file can be used to control the
     behavior of the db	library.  Extended attributes are simply lists of
     key/value pairs attached to each object in	the nsd	filesystem.  The
     attributes	supported in this library are:

	  This is the domainname given as a parameter to the remote name
	  server.  This	attribute is typically inherited from the daemon
	  depending on the nsswitch.conf file that is being read.  Given the
	  configuration	file /var/ns/domains/DOMAINNAME/nsswitch.conf the
	  attribute "domain" is	set to DOMAINNAME.  This attribute controls
	  which	file is	used to	supply the requested information.  Given a
	  domain DOMAINNAME the	library	would open the file
	  /var/ns/domains/DOMAINNAME/table.db.	If the domain attribute	is
	  unset	then the file /etc/table.db would be used.  See	the
	  information about the	table attribute	below.	A client system	can be
	  a member of multiple domains by including multiple instances of the
	  db keyword in	the nsswitch.conf file like:
	       hosts: db(domain=engr) db(domain=corp)

	  The table attribute is typically inherited from the daemon based on
	  the line from	which this entry occurs	in the nsswitch.conf file.  In
	  the above example the	table attribute	would be set to	hosts.byname
	  or hosts.byaddr depending on the context of the request.  This
	  attribute is used as the file	name containing	the db data, with a
	  ".db"	appended. For the hosts.byname map in the default domain the
	  file /etc/hosts.byname.db would be opened and	searched.

     key  The key attribute is used to fetch the data from the db(3B) file.
	  It is	set by the nsd(1M) daemon, and is used without alteration.

									Page 1

DB(7P)									DB(7P)

     file The file attribute overrides the domain and table attributes to set
	  the name of the file to be opened.  If the file begins with a
	  leading '/' then that	file is	simply opened.	If not,	then the
	  contents of this attribute are appended to the directory name	--
	  either /etc/ for the default domain, or /var/ns/domains/DOMAINNAME/
	  when the domain attribute is set.

	  The db_hash attribute	sets the hash type for a Berkeley db file.
	  The default is "btree".  The valid choices are btree,	hash, and
	  recno.   See dbopen(3) for detail on these.

	  The null_extend_key attribute	specifies that the null	character
	  which	terminates the key is really part of the key.  Some
	  applications (such as	sendmail) have historically included the null
	  in the key so	this attribute provides	backward compatibility with
	  the old behavior.

SEE ALSO    [Toc]    [Back]

     nsd(1M), dbopen(3), nsswitch.conf(4)
     IRIX Admin: Networking and	Mail

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