From the course: Linux System Engineer: Kernel Tuning and Remote Logging

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Tune live kernel parameters manually using sysctl

Tune live kernel parameters manually using sysctl

From the course: Linux System Engineer: Kernel Tuning and Remote Logging

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Tune live kernel parameters manually using sysctl

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- [Instructor] Managing kernel parameters is easy using tuned profiles. However, if you're doing a lot of performance testing and you want to change the configuration for testing purposes before committing it to a tuned.conf file, you can use the sysctl command or even change values in the sysfs virtual file system manually. Don't the get the sysctl command confused with systemctl which is a part of systemd. Sysctl predates systemctl by many years and is used just for changing kernel parameters. Let's start by getting a list of settings that we can change. In a terminal type in sysctl -a and hit enter. There are over 1000 different settings that can be modified with sysctl. The sysctl command allows us to modify settings in the /proc/sys directory. We can also use echo to overwrite these virtual files to change kernel parameters as well. Type in clear, and then type in sudo echo 1 > /proc/sys /kernel/sysrq and hit enter. You can see that even though we elevated privileges using sudo…

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