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57 lines
1.3 KiB
Markdown
57 lines
1.3 KiB
Markdown
# Sysctl
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## Table of contents <!-- omit in toc -->
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1. [TL;DR](#tldr)
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1. [Further readings](#further-readings)
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## TL;DR
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Default configuration files locations:
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1. `/run/sysctl.d/*.conf`
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1. `/etc/sysctl.d/*.conf`
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1. `/usr/local/lib/sysctl.d/*.conf`
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1. `/usr/lib/sysctl.d/*.conf`
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1. `/lib/sysctl.d/*.conf`
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1. `/etc/sysctl.conf`
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```sh
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# Show the value of a single setting.
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sysctl kernel.ostype
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sysctl vm.swappiness
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# Show the values of all settings.
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sysctl -a
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# Change the current value of a setting.
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sudo sysctl vm.swappiness=10
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sudo sysctl -w net.ipv4.ip_forward=1
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# Reload settings from specific configuration files.
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sudo sysctl -p
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sudo sysctl -p /etc/sysctl.d/99-swappiness.conf
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# Reload settings from the default configuration files locations.
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sudo sysctl --system
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# Set up persistent settings.
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echo 'vm.swappiness=10' | sudo tee -a /etc/sysctl.conf
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echo 'vm.swappiness = 5' | sudo tee -a /etc/sysctl.d/99-swappiness.conf
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```
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## Further readings
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- [How to reload sysctl.conf variables on Linux]
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- [Documentation for /proc/sys]
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<!--
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References
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-->
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<!-- Upstream -->
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[documentation for /proc/sys]: https://docs.kernel.org/admin-guide/sysctl/
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<!-- Others -->
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[how to reload sysctl.conf variables on linux]: https://www.cyberciti.biz/faq/reload-sysctl-conf-on-linux-using-sysctl/
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