197 lines
5.6 KiB
Groff
197 lines
5.6 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)reboot.8 8.1 (Berkeley) 6/9/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd December 20, 2017
|
|
.Dt REBOOT 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm reboot ,
|
|
.Nm halt ,
|
|
.Nm fastboot ,
|
|
.Nm fasthalt
|
|
.Nd stopping and restarting the system
|
|
.Sh SYNOPSIS
|
|
.Nm halt
|
|
.Op Fl lNnpq
|
|
.Op Fl k Ar kernel
|
|
.Nm
|
|
.Op Fl cdlNnpqr
|
|
.Op Fl k Ar kernel
|
|
.Nm fasthalt
|
|
.Op Fl lNnpq
|
|
.Op Fl k Ar kernel
|
|
.Nm fastboot
|
|
.Op Fl dlNnpq
|
|
.Op Fl k Ar kernel
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm halt
|
|
and
|
|
.Nm
|
|
utilities flush the file system cache to disk, send all running processes
|
|
a
|
|
.Dv SIGTERM
|
|
(and subsequently a
|
|
.Dv SIGKILL )
|
|
and, respectively, halt or restart the system.
|
|
The action is logged, including entering a shutdown record into the user
|
|
accounting database.
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width indent
|
|
.It Fl c
|
|
The system will turn off the power and then turn it back on if it can.
|
|
If the power down action fails, the system
|
|
will halt or reboot normally, depending on whether
|
|
.Nm halt
|
|
or
|
|
.Nm
|
|
was called.
|
|
At the present time, only the
|
|
.Xr ipmi 4
|
|
driver implements the power cycle functionality and only on hardware
|
|
with a BMC that supports power cycling.
|
|
Unlike power off, the amount of hardware that supports power cycling
|
|
is small.
|
|
.It Fl d
|
|
The system is requested to create a crash dump.
|
|
This option is
|
|
supported only when rebooting, and it has no effect unless a dump
|
|
device has previously been specified with
|
|
.Xr dumpon 8 .
|
|
.It Fl k Ar kernel
|
|
Boot the specified
|
|
.Ar kernel
|
|
on the next system boot.
|
|
If the kernel boots successfully, the
|
|
.Em default
|
|
kernel will be booted on successive boots, this is a one-shot option.
|
|
If the boot fails, the system will continue attempting to boot
|
|
.Ar kernel
|
|
until the boot process is interrupted and a valid kernel booted.
|
|
This may change in the future.
|
|
.It Fl l
|
|
The halt or reboot is
|
|
.Em not
|
|
logged to the system log.
|
|
This option is intended for applications such as
|
|
.Xr shutdown 8 ,
|
|
that call
|
|
.Nm
|
|
or
|
|
.Nm halt
|
|
and log this themselves.
|
|
.It Fl N
|
|
The file system cache is not flushed during the initial process clean-up,
|
|
however the kernel level
|
|
.Xr reboot 2
|
|
is still processed with a sync.
|
|
This option can be useful for performing a
|
|
.Dq best-effort
|
|
reboot when devices might be unavailable.
|
|
This can happen when devices have been disconnected, such as with
|
|
.Xr iscsi 4 .
|
|
.It Fl n
|
|
The file system cache is not flushed.
|
|
This option should probably not be used.
|
|
.It Fl p
|
|
The system will turn off the power if it can.
|
|
If the power down action fails, the system
|
|
will halt or reboot normally, depending on whether
|
|
.Nm halt
|
|
or
|
|
.Nm
|
|
was called.
|
|
.It Fl q
|
|
The system is halted or restarted quickly and ungracefully, and only
|
|
the flushing of the file system cache is performed (if the
|
|
.Fl n
|
|
option is not specified).
|
|
This option should probably not be used.
|
|
.It Fl r
|
|
The system kills all processes, unmounts all filesystems, mounts the new
|
|
root filesystem, and begins the usual startup sequence.
|
|
After changing vfs.root.mountfrom with
|
|
.Xr kenv 1 ,
|
|
.Nm Fl r
|
|
can be used to change the root filesystem while preserving kernel state.
|
|
This requires the
|
|
.Xr tmpfs 5
|
|
kernel module to be loaded because
|
|
.Xr init 8
|
|
needs a place to store itself after the old root is unmounted, but
|
|
before the new root is in place.
|
|
.El
|
|
.Pp
|
|
The
|
|
.Nm fasthalt
|
|
and
|
|
.Nm fastboot
|
|
utilities are nothing more than aliases for the
|
|
.Nm halt
|
|
and
|
|
.Nm
|
|
utilities.
|
|
.Pp
|
|
Normally, the
|
|
.Xr shutdown 8
|
|
utility is used when the system needs to be halted or restarted, giving
|
|
users advance warning of their impending doom and cleanly terminating
|
|
specific programs.
|
|
.Sh EXAMPLES
|
|
Replace current root filesystem with UFS mounted from
|
|
.Pa /dev/ada0s1a :
|
|
.Bd -literal -offset indent
|
|
kenv vfs.root.mountfrom=ufs:/dev/ada0s1a
|
|
reboot -r
|
|
.Ed
|
|
.Pp
|
|
This mechanism can also be used with NFS, with a caveat that
|
|
it only works with NFSv4, and requires a numeric IPv4 address:
|
|
.Bd -literal -offset indent
|
|
kenv vfs.root.mountfrom=nfs:192.168.1.1:/share/name
|
|
reboot -r
|
|
.Ed
|
|
.Sh SEE ALSO
|
|
.Xr kenv 1 ,
|
|
.Xr getutxent 3 ,
|
|
.Xr ipmi 4 ,
|
|
.Xr boot 8 ,
|
|
.Xr dumpon 8 ,
|
|
.Xr nextboot 8 ,
|
|
.Xr savecore 8 ,
|
|
.Xr shutdown 8 ,
|
|
.Xr sync 8
|
|
.Sh HISTORY
|
|
A
|
|
.Nm
|
|
utility appeared in
|
|
.Bx 4.0 .
|