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sysctl.conf(5) [centos man page]

SYSCTL.CONF(5)							   File Formats 						    SYSCTL.CONF(5)

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 = ; 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 exit. See also sysctl option --system. SEE ALSO
sysctl(8) AUTHOR
George Staikos <> REPORTING BUGS
Please send bug reports to <> procps-ng January 2012 SYSCTL.CONF(5)

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SYSCTL.D(5)							     sysctl.d							       SYSCTL.D(5)

sysctl.d - Configure kernel parameters at boot SYNOPSIS
/etc/sysctl.d/*.conf /run/sysctl.d/*.conf /usr/lib/sysctl.d/*.conf DESCRIPTION
systemd uses configuration files from the above directories to configure sysctl(8) kernel parameters to load during boot. CONFIGURATION FORMAT
The configuration files should simply contain a list of variable assignments, separated by newlines. Empty lines and lines whose first non-whitespace character is # or ; are ignored. Note that both / and . are accepted as separators in sysctl variable names. Each configuration file is named in the style of <program>.conf. Files in /etc/ overwrite files with the same name in /usr/lib/. Files in /run overwrite files with the same name in /etc/ and /usr/lib/. Packages should install their configuration files in /usr/lib/, files in /etc/ are reserved for the local administration, which possibly decides to overwrite the configurations installed from packages. All files are sorted by filename in alphabetical order, regardless in which of the directories they reside, to ensure that a specific configuration file takes precedence over another file with an alphabetically later name. EXAMPLE
Example 1. /etc/sysctl.d/domain-name.conf example: # Set kernel YP domain name SEE ALSO
systemd(1), sysctl(8), sysctl.conf(5) AUTHOR
Lennart Poettering <> Developer systemd 10/07/2013 SYSCTL.D(5)
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