'\" te
.\" Copyright (c) 2004, Sun Microsystems, Inc. All Rights Reserved
.\" Copyright 1989 AT&T
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.TH DOMAINNAME 8 "May 13, 2017"
.SH NAME
domainname \- set or display name of the current domain
.SH SYNOPSIS
.LP
.nf
\fBdomainname\fR [\fIname-of-domain\fR]
.fi

.SH DESCRIPTION
.LP
Without an argument, \fBdomainname\fR displays the name of the current domain
name used in RPC exchanges, usually referred to as the NIS domain name.
This name typically encompasses a group of \fBhosts\fR or \fBpasswd\fR entries
under the same administration. The \fBdomainname\fR command is used by various
components of Solaris to resolve names for entries such as are found in
\fBpasswd\fR, \fBhosts\fR and \fBaliases\fR. By default, naming services such
as \fBNIS\fR use \fBdomainname\fR to resolve names.
.sp
.LP
With appropriate privileges (root or an equivalent role [see \fBrbac\fR(7)]),
you can set the name of the domain by specifying the name as an argument to the
\fBdomainname\fR command.
.sp
.LP
The domain name for various naming services can also be set by other means. For
example, \fBypinit\fR can be used to specify a different domain for all
\fBNIS\fR calls. The domain name of the machine is usually set during boot time
through the \fBdomainname\fR command by the \fBsvc:/system/identity:domain\fR
service. If the new domain name is not saved in the \fB/etc/defaultdomain\fR
file, the machine reverts to the old domain after it reboots.
.sp
.LP
The \fBsendmail\fR(8) daemon, as shipped with Solaris, and the \fBsendmail\fR
implementation provided by \fBsendmail.org\fR (formerly referred to as
"Berkeley 8.x sendmail") both attempt to determine a local host's fully
qualified host name at startup and both pursue follow-up actions if the initial
search fails. It is in these follow-up actions that the two implementations
differ.
.sp
.LP
Both implementations use a standard Solaris or Unix system call to determine
its fully qualified host name at startup, following the name service priorities
specified in \fBnsswitch.conf\fR(5). To this point, the Solaris and
\fBsendmail.org\fR versions behave identically.
.sp
.LP
If the request for a fully qualified host name fails, the \fBsendmail.org\fR
\fBsendmail\fR sleeps for 60 seconds, tries again, and, upon continuing
failure, resorts to a short name. The Solaris version of \fBsendmail\fR makes
the same initial request, but then, following initial failure, calls
\fBdomainname\fR. If successful, the sleep is avoided.
.sp
.LP
On a Solaris machine, if you run the \fBsendmail.org\fR version of sendmail,
you get the startup behavior (omitting the \fBdomainname\fR call) described
above. If you run the Solaris \fBsendmail\fR, the \fBdomainname\fR call is made
if needed.
.sp
.LP
If the Solaris \fBsendmail\fR cannot determine the fully qualified host name,
use \fBcheck-hostname\fR(8) as a troubleshooting aid. This script can offer
guidance as to appropriate corrective action.
.SH FILES
.ne 2
.na
\fB\fB/etc/defaultdomain\fR\fR
.ad
.RS 22n

.RE

.sp
.ne 2
.na
\fB\fB/etc/nsswitch.conf\fR\fR
.ad
.RS 22n

.RE

.SH SEE ALSO
.LP
.BR svcs (1),
.BR aliases (5),
.BR defaultdomain (5),
.BR hosts (5),
.BR nsswitch.conf (5),
.BR passwd (5),
.BR attributes (7),
.BR rbac (7),
.BR smf (7),
.BR check-hostname (8),
.BR hostconfig (8),
.BR named (8),
.BR sendmail (8),
.BR svcadm (8),
.BR ypinit (8)
.SH NOTES
.LP
The \fBdomainname\fR service is managed by the service management facility,
\fBsmf\fR(7), under the service identifier:
.sp
.in +2
.nf
svc:/system/identity:domain
.fi
.in -2
.sp

.sp
.LP
Administrative actions on this service, such as enabling, disabling, or
requesting restart, can be performed using \fBsvcadm\fR(8). The service's
status can be queried using the \fBsvcs\fR(1) command.