SYSCTL.CONF(5) File Formats SYSCTL.CONF(5)
sysctl.conf - sysctl preload/configuration file
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.
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.
# sysctl.conf sample # kernel.domainname = example.com ; this one has a space which will be written to the sysctl! kernel.modprobe = /sbin/mod probe
/etc/sysctl.d/*.conf /run/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.
George Staikos ⟨email@example.com⟩
Please send bug reports to ⟨firstname.lastname@example.org⟩
This page is part of the procps-ng (/proc filesystem utilities) project. Information about the project can be found at ⟨https://gitlab.com/procps-ng/procps⟩. If you have a bug report for this manual page, see ⟨https://gitlab.com/procps-ng/procps/blob/master/Documentation/bugs.md⟩. This page was obtained from the project's upstream Git repository ⟨https://gitlab.com/procps-ng/procps.git⟩ on 2022-12-18. (At that time, the date of the most recent commit that was found in the repository was 2022-12-13.) If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up-to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to email@example.com procps-ng 2021-09-15 SYSCTL.CONF(5)
Pages that refer to this page: sysctl.d(5), sysctl(8)