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: src/share/man/man5/sysctl.conf.5,v 1.3.4.9 2002/01/09 16:10:10 ru Exp $ 26.\" $DragonFly: src/share/man/man5/sysctl.conf.5,v 1.2 2003/06/17 04:37:00 dillon Exp $ 27.\" 28.Dd December 30, 1999 29.Dt SYSCTL.CONF 5 30.Os 31.Sh NAME 32.Nm sysctl.conf 33.Nd kernel state defaults 34.Sh DESCRIPTION 35The 36.Pa /etc/sysctl.conf 37file is read in when the system goes into multi-user mode to set default 38settings for the kernel. The 39.Pa /etc/sysctl.conf 40is in the format of the 41.Xr sysctl 8 42command, i.e.\& 43.Bd -literal -offset indent 44sysctl_mib=value 45.Ed 46.Pp 47Comments are denoted by a 48.Dq # 49at the beginning of a line. Comments can also exist at the end of a line, 50as seen in the 51.Sx EXAMPLES 52section, below. 53.Sh FILES 54.Bl -tag -width /etc/sysctl.conf -compact 55.It Pa /etc/sysctl.conf 56Initial settings for 57.Xr sysctl 8 . 58.El 59.Sh EXAMPLES 60To turn off logging of programs that exit due to fatal signals you may use 61a configuration like 62.Bd -literal -offset indent 63# Configure logging. 64kern.logsigexit=0 # Do not log fatal signal exits (e.g. sig 11) 65.Ed 66.Sh SEE ALSO 67.Xr rc.conf 5 , 68.Xr rc 8 , 69.Xr sysctl 8 70.Sh HISTORY 71The 72.Nm 73file appeared in 74.Fx 4.0 . 75.Sh BUGS 76If loadable kernel modules are used to introduce additional kernel 77functionality and sysctls to manage that functionality, 78.Nm 79may be processed too early in the boot process to set those sysctls. 80For example, sysctls to manage the linux emulator cannot be set in 81.Nm 82if the linux emulator is loaded as a module rather than 83compiled into the kernel. 84