101 lines
2.4 KiB
Groff
101 lines
2.4 KiB
Groff
.\"
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.\" CDDL HEADER START
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.\"
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.\" The contents of this file are subject to the terms of the
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.\" Common Development and Distribution License (the "License").
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.\" You may not use this file except in compliance with the License.
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.\"
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.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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.\" or http://www.opensolaris.org/os/licensing.
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.\" See the License for the specific language governing permissions
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.\" and limitations under the License.
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.\"
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.\" When distributing Covered Code, include this CDDL HEADER in each
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.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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.\" If applicable, add the following below this CDDL HEADER, with the
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.\" fields enclosed by brackets "[]" replaced with your own identifying
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.\" information: Portions Copyright [yyyy] [name of copyright owner]
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.\"
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.\" CDDL HEADER END
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.\"
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.\" Copyright (c) 2017 by Lawrence Livermore National Security, LLC.
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.\"
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.Dd May 26, 2021
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.Dt ZGENHOSTID 8
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.Os
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.
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.Sh NAME
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.Nm zgenhostid
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.Nd generate host ID into /etc/hostid
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.Sh SYNOPSIS
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.Nm
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.Op Fl f
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.Op Fl o Ar filename
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.Op Ar hostid
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.
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.Sh DESCRIPTION
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Creates
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.Pa /etc/hostid
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file and stores the host ID in it.
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If
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.Ar hostid
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was provided, validate and store that value.
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Otherwise, randomly generate an ID.
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.
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.Sh OPTIONS
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.Bl -tag -width "-o filename"
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.It Fl h
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Display a summary of the command-line options.
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.It Fl f
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Allow output overwrite.
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.It Fl o Ar filename
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Write to
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.Pa filename
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instead of the default
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.Pa /etc/hostid .
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.It Ar hostid
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Specifies the value to be placed in
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.Pa /etc/hostid .
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It should be a number with a value between 1 and 2^32-1.
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If
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.Sy 0 ,
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generate a random ID.
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This value
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.Em must
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be unique among your systems.
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It
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.Em must
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be an 8-digit-long hexadecimal number, optionally prefixed by
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.Qq 0x .
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.El
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.
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.Sh FILES
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.Pa /etc/hostid
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.
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.Sh EXAMPLES
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.Bl -tag -width Bd
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.It Generate a random hostid and store it
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.Dl # Nm
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.It Record the libc-generated hostid in Pa /etc/hostid
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.Dl # Nm Qq $ Ns Pq Nm hostid
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.It Record a custom hostid Po Ar 0xdeadbeef Pc in Pa /etc/hostid
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.Dl # Nm Ar deadbeef
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.It Record a custom hostid Po Ar 0x01234567 Pc in Pa /tmp/hostid No and overwrite the file if it exists
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.Dl # Nm Fl f o Ar /tmp/hostid 0x01234567
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.El
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.
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.Sh SEE ALSO
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.Xr genhostid 1 ,
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.Xr hostid 1 ,
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.Xr sethostid 3 ,
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.Xr spl 4
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.
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.Sh HISTORY
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.Nm
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emulates the
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.Xr genhostid 1
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utility and is provided for use on systems which
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do not include the utility or do not provide the
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.Xr sethostid 3
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function.
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