e307eb94ae
bootonce feature is temporary, one time boot, activated by "bectl activate -t BE", "bectl activate -T BE" will reset the bootonce flag. By default, the bootonce setting is reset on attempt to boot and the next boot will use previously active BE. By setting zfs_bootonce_activate="YES" in rc.conf, the bootonce BE will be set permanently active. bootonce dataset name is recorded in boot pool labels, bootenv area. in case of nextboot, the nextboot_enable boolean variable is recorded in freebsd:nvstore nvlist, also stored in boot pool label bootenv area. On boot, the loader will process /boot/nextboot.conf if nextboot_enable is "YES", and will set nextboot_enable to "NO", preventing /boot/nextboot.conf processing on next boot. bootonce and nextboot features are usable in both UEFI and BIOS boot. To use bootonce/nextboot features, the boot loader needs to be updated on disk; if loader.efi is stored on ESP, then ESP needs to be updated and for BIOS boot, stage2 (zfsboot or gptzfsboot) needs to be updated (gpart or other tools). At this time, only lua loader is updated. Sponsored by: Netflix, Klara Inc. Differential Revision: https://reviews.freebsd.org/D25512
144 lines
3.5 KiB
Groff
144 lines
3.5 KiB
Groff
.\" 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 July 22, 2020
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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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.Nm
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.Op Fl n Ar name
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.Op Fl k Ar key
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.Op Fl p
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.Op Fl t Ar type
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.Op Fl v Ar value
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.Op Fl z Ar pool
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.Nm
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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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.Xr gptzfsboot 8
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or
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.Xr loader 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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or
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.Xr loader 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 boot environment area of a ZFS pool.
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.Pp
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If used without arguments,
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.Nm
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will output the current boot configuration, if set.
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.Pp
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The following options are supported by
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.Nm :
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.Bl -tag -width indent
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.It Fl k Ar key
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Define key for
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.Ao key , value Ac
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pair.
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.It Fl n Ar name
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Update nvlist
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.Ar name .
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.It Fl p
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Print all information stored in ZFS pool bootenv area.
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.It Fl t Ar type
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Set type of
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.Ar value
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used in
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.Ao key , value Ac
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pair.
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Currently supported types are:
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.Bl -tag -width indent -compact
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.It Ar DATA_TYPE_BYTE
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.It Ar DATA_TYPE_INT8
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.It Ar DATA_TYPE_UINT8
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.It Ar DATA_TYPE_INT16
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.It Ar DATA_TYPE_UINT16
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.It Ar DATA_TYPE_INT32
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.It Ar DATA_TYPE_UINT32
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.It Ar DATA_TYPE_INT64
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.It Ar DATA_TYPE_UINT64
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.It Ar DATA_TYPE_BOOLEAN_VALUE
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.It Ar DATA_TYPE_STRING
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.El
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.Pp
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If not specified, the default is
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.Ar DATA_TYPE_STRING .
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.It Fl v Ar value
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Define value for
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.Ao key , value Ac
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pair.
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.It Fl z Ar pool
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Operate on
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.Ar pool .
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.El
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.Sh ENVIRONMENT
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.Bl -tag -width vfs.root.mountfrom -compact
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.It Ev vfs.root.mountfrom
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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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.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 bectl 8 ,
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.Xr gptzfsboot 8 ,
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.Xr loader 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 11.1 .
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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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