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Turning the multihost property on requires that a hostid be set to allow ZFS to determine when a foreign system is attemping to import a pool. The error message instructing the user to set a hostid refers to genhostid(1). Genhostid(1) is not available on SUSE Linux. This commit adds a script modeled after genhostid(1) for those users. Zgenhostid checks for an /etc/hostid file; if it does not exist, it creates one and stores a value. If the user has provided a hostid as an argument, that value is used. Otherwise, a random hostid is generated and stored. This differs from the CENTOS 6/7 versions of genhostid, which overwrite the /etc/hostid file even though their manpages state otherwise. A man page for zgenhostid is added. The one for genhostid is in (1), but I put zgenhostid in (8) because I believe it's more appropriate. The mmp tests are modified to use zgenhostid to set the hostid instead of using the spl_hostid module parameter. zgenhostid will not replace an existing /etc/hostid file, so new mmp_clear_hostid calls are required. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #6358 Closes #6379
73 lines
2.0 KiB
Groff
73 lines
2.0 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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.\"
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.\" Copyright (c) 2017 by Lawrence Livermore National Security, LLC.
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.\"
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.Dd July 24, 2017
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.Dt ZGENHOSTID 8 SMM
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.Os Linux
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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 Ar hostid
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.Sh DESCRIPTION
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If
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.Em /etc/hostid
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does not exist, create it and store a hostid in it. If the user provides
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.Op Ar hostid
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on the command line, store that value. Otherwise, randomly generate a
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value to store.
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.Pp
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This emulates the
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.Xr genhostid 1
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utility and is provided for use on systems which do not include the utility.
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.Pp
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.Sh OPTIONS
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.Op Ar hostid
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Specifies the value to be placed in
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.Em /etc/hostid .
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It must be a number with a value between 1 and 2^32-1. This value
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.Sy must
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be unique among your systems. It must be expressed in hexadecimal and be
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exactly 8 digits long.
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.Sh EXAMPLES
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.Bl -tag -width Ds
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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 Em /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 Em etc/hostid
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.Bd -literal
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# zgenhostid deadbeef
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.Ed
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.El
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.Sh SEE ALSO
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.Xr spl-module-parameters 5 ,
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.Xr genhostid 1 ,
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.Xr hostid 1
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