.\"
.\" CDDL HEADER START
.\"
.\" The contents of this file are subject to the terms of the
.\" Common Development and Distribution License (the "License").
.\" You may not use this file except in compliance with the License.
.\"
.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
.\" or http://www.opensolaris.org/os/licensing.
.\" See the License for the specific language governing permissions
.\" and limitations under the License.
.\"
.\" When distributing Covered Code, include this CDDL HEADER in each
.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
.\" If applicable, add the following below this CDDL HEADER, with the
.\" fields enclosed by brackets "[]" replaced with your own identifying
.\" information: Portions Copyright [yyyy] [name of copyright owner]
.\"
.\" CDDL HEADER END
.\"
.\"
.\" Copyright (c) 2017 by Lawrence Livermore National Security, LLC.
.\"
.Dd September 16, 2017
.Dt ZGENHOSTID 8 SMM
.Os Linux
.Sh NAME
.Nm zgenhostid
.Nd generate and store a hostid in
.Em /etc/hostid
.Sh SYNOPSIS
.Nm
.Op Ar hostid
.Sh DESCRIPTION
If
.Em /etc/hostid
does not exist, create it and store a hostid in it.  If the user provides
.Op Ar hostid
on the command line, store that value.  Otherwise, randomly generate a
value to store.
.Pp
This emulates the
.Xr genhostid 1
utility and is provided for use on systems which do not include the utility.
.Sh OPTIONS
.Op Ar hostid
Specifies the value to be placed in
.Em /etc/hostid .
It must be a number with a value between 1 and 2^32-1.  This value
.Sy must
be unique among your systems.  It must be expressed in hexadecimal and be
exactly 8 digits long.
.Sh EXAMPLES
.Bl -tag -width Ds
.It Generate a random hostid and store it
.Bd -literal
# zgenhostid
.Ed
.It Record the libc-generated hostid in Em /etc/hostid
.Bd -literal
# zgenhostid $(hostid)
.Ed
.It Record a custom hostid (0xdeadbeef) in Em etc/hostid
.Bd -literal
# zgenhostid deadbeef
.Ed
.El
.Sh SEE ALSO
.Xr genhostid 1 ,
.Xr hostid 1 ,
.Xr spl-module-parameters 5