1.\" Copyright (c) 1999 Chris Costello <chris@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd December 30, 1999 28.Dt SYSCTL.CONF 5 29.Os 30.Sh NAME 31.Nm sysctl.conf 32.Nd kernel state defaults 33.Sh DESCRIPTION 34The 35.Pa /etc/sysctl.conf 36file is read in when the system goes into multi-user mode to set default 37settings for the kernel. The 38.Pa /etc/sysctl.conf 39is in the format of the 40.Xr sysctl 8 41command, i.e.\& 42.Bd -literal -offset indent 43sysctl_mib=value 44.Ed 45.Pp 46Comments are denoted by a 47.Dq # 48at the beginning of a line. Comments can also exist at the end of a line, 49as seen in the 50.Sx EXAMPLES 51section, below. 52.Sh FILES 53.Bl -tag -width /etc/sysctl.conf -compact 54.It Pa /etc/sysctl.conf 55Initial settings for 56.Xr sysctl 8 . 57.El 58.Sh EXAMPLE 59To turn off logging of programs that exit due to fatal signals you may use 60a configuration like 61.Bd -literal -offset indent 62# Configure logging. 63kern.logsigexit=0 # Do not log fatal signal exits (e.g. sig 11) 64.Ed 65.Sh SEE ALSO 66.Xr rc.conf 5 , 67.Xr rc 8 , 68.Xr sysctl 8 69.Sh HISTORY 70The 71.Nm 72file appeared in 73.Fx 4.0 . 74.Sh BUGS 75If loadable kernel modules are used to introduce additional kernel 76functionality and sysctls to manage that functionality, sysctl.conf may 77be processed too early in the boot process to set those sysctls. 78For example, sysctls to manage the linux emulator cannot be set in 79sysctl.conf if the linux emulator is loaded as a module rather than 80compiled into the kernel. 81