Kernel Tuneable's

Kernel Tunables

In Linux, a tunable refers to a specific type of configuration setting within the kernel. These tunables allow you to customize the behavior of the kernel while the system is running, offering more fine-grained control over how your system operates.

There are lots of tunables set for the Linux Kernel that dictate how the system will handle a variety of system aspects. As an example, there's a tunable for the maximum number of files that a Linux system can have open at any one time, called 'fs-file-max'

View all tunables:

sysctl -a 

View specific tunable:

sysctl tunable-name

Change tunable value (doesn't persist reboot):

sysctl -w tunable-name=newvalue

Permanently change tunable value

Specifically where this can be done is OS dependent, a typical location is /etc/sysctl.d

Create a new file ie 00-custom-settings.conf

contents:
tunable-name=newvalue