46c9952807
The possibility of using a sysctl.conf.local on a machine that has a shared sysctl.conf(5) isn't documented. So mention the sysctl.conf.local in the manual page. PR: 254901 Submitted by: Jose Luis Duran <jlduran at gmail dot com> Reported by: Jose Luis Duran <jlduran at gmail dot com> Reviewed by: markj MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D29673
92 lines
2.8 KiB
Groff
92 lines
2.8 KiB
Groff
.\" Copyright (c) 1999 Chris Costello <chris@FreeBSD.org>
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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 April 8, 2021
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.Dt SYSCTL.CONF 5
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.Os
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.Sh NAME
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.Nm sysctl.conf
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.Nd kernel state defaults
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.Sh DESCRIPTION
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The
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.Pa /etc/sysctl.conf
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file is read in when the system goes into multi-user mode to set default
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settings for the kernel.
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The
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.Pa /etc/sysctl.conf
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file is in the format of the
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.Xr sysctl 8
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command, i.e.,
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.Bd -literal -offset indent
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sysctl_mib=value
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.Ed
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.Pp
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Comments are denoted by a
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.Dq #
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at the beginning of a line.
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Comments can also exist at the end of a line,
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as seen in the
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.Sx EXAMPLES
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section, below.
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.Sh FILES
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.Bl -tag -width /etc/sysctl.conf.local -compact
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.It Pa /etc/sysctl.conf
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Initial settings for
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.Xr sysctl 8 .
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.It Pa /etc/sysctl.conf.local
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Machine-specific settings for sites with a common
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.Pa /etc/sysctl.conf .
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.El
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.Sh EXAMPLES
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To turn off logging of programs that exit due to fatal signals you may use
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a configuration like
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.Bd -literal -offset indent
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# Configure logging.
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kern.logsigexit=0 # Do not log fatal signal exits (e.g., sig 11)
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.Ed
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.Sh SEE ALSO
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.Xr rc.conf 5 ,
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.Xr rc 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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file appeared in
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.Fx 4.0 .
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.Sh BUGS
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If loadable kernel modules are used to introduce additional kernel
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functionality and sysctls to manage that functionality,
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.Nm
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may be processed too early in the boot process to set those sysctls.
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For example, sysctls to manage the Linux compatibility layer
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.Po
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.Xr linux 4
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.Pc
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cannot be set in
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.Nm
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if the Linux compatibility layer is loaded as a module rather than
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compiled into the kernel.
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