sysctl.conf(5) — Linux manual page


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

NAME         top

       sysctl.conf - sysctl preload/configuration file

DESCRIPTION         top

       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.

       If a line begins with a single -, any attempts to set the value
       that fail will be ignored.

NOTES         top

       As the /etc/sysctl.conf file is used to override default kernel
       parameter values, only a small number of parameters is predefined
       in the file.  Use /sbin/sysctl -a or follow sysctl(8) to list all
       possible parameters. The description of individual parameters can
       be found in the kernel documentation.

       Maximum supported line length of the value is 4096 characters due
       to a limitation of /proc entries in Linux kernel.

EXAMPLE         top

              # sysctl.conf sample
                kernel.domainname =
              ; this one has a space which will be written to the sysctl!
                kernel.modprobe = /sbin/mod probe

FILES         top


       The paths where sysctl preload files usually exist.  See also
       sysctl option --system.

SEE ALSO         top


AUTHOR         top

       George Staikos ⟨⟩

REPORTING BUGS         top

       Please send bug reports to ⟨⟩

COLOPHON         top

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       project.  Information about the project can be found at 
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       for this manual page, see
       This page was obtained from the project's upstream Git repository
       ⟨⟩ on 2023-12-22.  (At
       that time, the date of the most recent commit that was found in
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procps-ng                      2021-09-15                 SYSCTL.CONF(5)

Pages that refer to this page: sysctl.d(5)sysctl(8)