SYSCTL.CONF(5) File Formats SYSCTL.CONF(5)NAME
sysctl.conf - sysctl preload/configuration file
DESCRIPTION
sysctl.conf is a simple file containing sysctl values to be read in and set by sysctl. The syntax is simply as follows:
# comment
; comment
token = value
Note that blank lines are ignored, and whitespace before and after a token or value is ignored, although a value can contain whitespace
within. Lines which begin with a # or ; are considered comments and ignored.
EXAMPLE
# sysctl.conf sample
#
kernel.domainname = example.com
; this one has a space which will be written to the sysctl!
kernel.modprobe = /sbin/mod probe
FILES
/run/sysctl.d/*.conf
/etc/sysctl.d/*.conf
/usr/local/lib/sysctl.d/*.conf
/usr/lib/sysctl.d/*.conf
/lib/sysctl.d/*.conf
/etc/sysctl.conf
The paths where sysctl preload files usually exist. See also sysctl option --system.
SEE ALSO sysctl(8)AUTHOR
George Staikos <staikos@0wned.org>
REPORTING BUGS
Please send bug reports to <procps@freelists.org>
procps-ng January 2012 SYSCTL.CONF(5)
Check Out this Related Man Page
SYSCTL(8)SYSCTL(8)NAME
sysctl - configure kernel parameters at runtime
SYNOPSIS
sysctl [-n] [-e] variable ...
sysctl [-n] [-e] [-q] -w variable=value ...
sysctl [-n] [-e] [-q] -p [filename]
sysctl [-n] [-e] -a
sysctl [-n] [-e] -A
DESCRIPTION
sysctl is used to modify kernel parameters at runtime. The parameters available are those listed under /proc/sys/. Procfs is required for
sysctl support in Linux. You can use sysctl to both read and write sysctl data.
PARAMETERS
variable
The name of a key to read from. An example is kernel.ostype. The '/' separator is also accepted in place of a '.'.
variable=value
To set a key, use the form variable=value where variable is the key and value is the value to set it to. If the value contains
quotes or characters which are parsed by the shell, you may need to enclose the value in double quotes. This requires the -w param-
eter to use.
-n Use this option to disable printing of the key name when printing values.
-e Use this option to ignore errors about unknown keys.
-N Use this option to only print the names. It may be useful with shells that have programmable completion.
-q Use this option to not display the values set to stdout.
-w Use this option when you want to change a sysctl setting.
-p Load in sysctl settings from the file specified or /etc/sysctl.conf if none given. Specifying - as filename means reading data from
standard input.
-a Display all values currently available.
-A Display all values currently available in table form.
EXAMPLES
/sbin/sysctl -a
/sbin/sysctl -n kernel.hostname
/sbin/sysctl -w kernel.domainname="example.com"
/sbin/sysctl -p /etc/sysctl.conf
FILES
/proc/sys
/etc/sysctl.conf
SEE ALSO sysctl.conf(5)BUGS
The -A parameter behaves just as -a does.
AUTHOR
George Staikos, <staikos@0wned.org>
21 Sep 1999 SYSCTL(8)
HI folks. I am developing a protocol and I need to bind to an IP address that is not configured to my machine. The problem is with bind(). The sysctl system call seamed to overcome the problem of bind if you set the proc/sys/net/ipv4/ip_nonlocal_bind flag. Although I tryed to set the flag either... (7 Replies)
dear fellows;
i have used ld.so.preload file to override connect() function, dynamic library overriding, it did worked really fine ......
but i went on to struck in a situation ... within the overrided connect() i have used printf once to see IP and Port to whom the connect request is being... (1 Reply)
As per Hardening guide for the server.
ICMP Broadcast Response: The kernel parameter icmp_echo_ignore_broadcasts must match to 1
However when i check the value of icmp_echo_ignore_broadcasts it thrown an error as unkonwn key.
# sysctl icmp_echo_ignore_broadcasts
error:... (2 Replies)
PH-UX newbie here, so please go slowly, step by step.
I've just tried to install XSW700GR1020 patch set (December 2001 CD) to my preloaded HP-UX 10.20 system.
After running for ages and installing pretty much most of the patches, when the mk_kernel step was run it failed with an unresolved... (7 Replies)
Hi
I am trying to setup a very basic dhcp dual stack configuration, so I have 2 dhcpd.conf file dhcpd4.conf and dhcpd6.conf
# cat /usr/local/etc/dhcpd4.conf
Subnet 10.45.192.0 netmask 255.255.248.0 {
option subnet-mask 255.255.248.0;
option routers 10.45.192.1;
}# cat... (0 Replies)
I typed in sysctl -A | grep na
result:
error: "Success" reading key "dev.parport.parport0.autoprobe"
error: permission denied on key 'net.ipv4.route.flush'
what about these errors? (9 Replies)
(solved,sry)
Heyas
I'd like to give a little preview of an existing conf file, but not showing comments or empty lines.
Sadly, either the output style is wrong, or not all values are printed.
My current issue is, that the first variable read (var) contains both, the first and the second... (2 Replies)