113 lines
3.2 KiB
Groff
113 lines
3.2 KiB
Groff
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.\" Copyright (c) 2016 Andriy Gapon
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 12, 2016
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.Dt ZFSBOOTCFG 8
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.Os
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.Sh NAME
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.Nm zfsbootcfg
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.Nd "specify zfsboot options for the next boot"
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.Sh SYNOPSIS
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.Nm
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.Ao Ar options Ac
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.Sh DESCRIPTION
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.Nm
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is used to set
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.Xr boot.config 5 Ns -style
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options to be used by
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.Xr zfsboot 8
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or
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.Xr gptzfsboot 8
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the next time the machine is booted.
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Once
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.Xr zfsboot 8
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or
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.Xr gptzfsboot 8
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reads the information, it is deleted.
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If booting fails, the machine automatically reverts to the previous
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boot configuration.
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The information is stored in a special reserved area of a ZFS pool.
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.Xr zfsboot 8
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or
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.Xr gptzfsboot 8
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read the boot option information from the first disk found in the first
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ZFS pool found.
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.Sh ENVIRONMENT
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.Bl -tag -width vfs.zfs.boot.primary_pool -compact
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.It Ev vfs.zfs.boot.primary_pool
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The
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.Xr kenv 1
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variable that identifies a pool for which the options are written.
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.It Ev vfs.zfs.boot.primary_vdev
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The
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.Xr kenv 1
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variable that identifies a disk within the pool where the options
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are written.
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.El
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.Sh EXAMPLES
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Try to boot to a new
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.Em boot environment
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without changing the
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.Cm bootfs
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property of a pool:
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.Pp
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.Dl "zfsbootcfg ""zfs:tank/ROOT/newbe:""
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.Pp
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To clear the boot options:
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.Pp
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.Dl "zfsbootcfg """"
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.Sh SEE ALSO
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.Xr boot.config 5 ,
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.Xr gptzfsboot 8 ,
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.Xr zfsboot 8
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.Sh HISTORY
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.Nm
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appeared in
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.Fx 12.0 .
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.Sh AUTHORS
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This manual page was written by
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.An Andriy Gapon Aq Mt avg@FreeBSD.org .
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.Sh CAVEATS
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At the moment,
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.Nm
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uses the
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.Ev vfs.zfs.boot.primary_pool
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and
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.Ev vfs.zfs.boot.primary_vdev
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.Xr kenv 1
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variables to determine a ZFS pool and a disk in it where the options
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are to be stored.
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The variables are set by the ZFS boot chain, so there is an assumption
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that the same boot disk is going to be used for the next reboot.
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There is no
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.Nm
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option to specify a different pool or a different disk.
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.Pp
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.Nm
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should be extended to install new
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.Xr zfsboot 8
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blocks in a ZFS pool.
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