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.\" Copyright (c) 2017 by Lawrence Livermore National Security, LLC.
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.\"
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2021-03-20 01:39:42 -04:00
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.Dd March 18, 2021
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.Dt ZGENHOSTID 8 SMM
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.Os
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.Sh NAME
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.Nm zgenhostid
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.Nd generate and store a hostid in
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.Em /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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.Sh DESCRIPTION
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Creates
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.Pa /etc/hostid
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file and stores hostid in it.
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If the user provides
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.Op Ar hostid
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on the command line, validates and stores that value.
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Otherwise, randomly generates a value to store.
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.Bl -tag -width "hostid"
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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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Force file 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 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 it is 0, zgenhostid will generate a random hostid.
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This value
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.Sy must
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be unique among your systems.
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It
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.Sy must
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be expressed in hexadecimal and be exactly
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.Em 8
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digits long, optionally prefixed by
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.Em 0x .
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.El
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.Sh FILES
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.Pa /etc/hostid
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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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.Bd -literal
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# zgenhostid
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.Ed
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.It Record the libc-generated hostid in Pa /etc/hostid
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.Bd -literal
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# zgenhostid "$(hostid)"
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.Ed
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.It Record a custom hostid (0xdeadbeef) in Pa /etc/hostid
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.Bd -literal
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# zgenhostid deadbeef
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.Ed
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.It Record a custom hostid (0x01234567) in Pa /tmp/hostid
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and ovewrite the file if it exists
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.Bd -literal
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# zgenhostid -f -o /tmp/hostid 0x01234567
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.Ed
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.El
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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-module-parameters 5
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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
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.Xr sethostid 3
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call.
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