[SOLVED] changing kernel parameter

itmahesh · 08-16-2012, 08:56 AM

how to change kernel parameters

linuxxer · 08-16-2012, 09:19 AM

To change kernel parameter, command:

Code:

$ sysctl

http://linux.die.net/man/8/sysctl
(OR)
You can modify kernel paremeters using /proc filesystem.
In /proc/sys contains all changeable kernel parameters.

eg. To enable IP forwarding

Code:

# echo 1 > /proc/sys/net/ipv4/ip_forward

Code:

# sysctl -w net.ipv4.ip_forward=1

If want to apply changes during system bootup
make changes in /etc/sysctl.conf
(OR) add "echo 1 > /proc/sys/net/ipv4/ip_forward" command in /etc/rc.local.

sundialsvcs · 08-17-2012, 07:57 AM

This question could be interpreted in several ways ...

The boot loader has the capability to provide the kernel with a string of characters, which the kernel can interpret during startup and which it keeps for reference the entire time that the system is running. To change the string that is provided at boot-time requires a procedure that is specific to the boot loader which is being used.

Many of the effects of kernel parameter values can be affected by writing to one or more of the pseudo-files in /proc, an act which requires super-powers.