![]() ![]() Please note that the first characters in each line match the names of the directories inside /proc/sys: Understand Linux /proc Filesystemįor example, the highlighted line: = drive name: sr0 Let’s take a look at the first few lines. ![]() If you want to view the complete list of Kernel parameters, just do: # sysctl -aĪs the the output of the above command will consist of A LOT of lines, we can use a pipeline followed by less to inspect it more carefully: # sysctl -a | less The exact number of parameters that can be modified can be viewed with: # sysctl -a | wc -l To modify the kernel runtime parameters we will use the sysctl command. vm: use of the kernel’s virtual memory.fs: filesystem configuration (quotas and inodes, for example).dev: parameters for specific devices connected to the machine.In turn, each of them will contain other subdirectories where the values for each parameter category are maintained: The actual internal structure of /proc/sys depends heavily on the kernel being used, but you are likely to find the following directories inside. Particularly, /proc/sys is where you can find all the information about devices, drivers, and some kernel features. ![]() The latest specification of the Filesystem Hierarchy Standard indicates that /proc represents the default method for handling process and system information as well as other kernel and memory information. Thus, you are allowed to enable or disable kernel parameters on-the-fly without much difficulty when it is needed due to a required change in the way the system is expected to operate. Similarly, you can use the command line in a running Linux system to alter certain runtime kernel parameters as a one-time modification, or permanently by editing a configuration file. In Part 13 of this LFCS (Linux Foundation Certified Sysadmin) series we explained how to use GRUB to modify the behavior of the system by passing options to the kernel for the ongoing boot process. ![]()
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