topic Re: Changing Linux Kernel Parameter without rebooting box. in Operating System - Linux

Changing Linux Kernel Parameter without rebooting box.

Gulam Mohiuddin — Fri, 02 Nov 2007 10:30:29 GMT

I did following commands to change Linux (RHEL AS 4.0 32-bit) Kernel Parameters to take effect without rebooting the Server.

echo "kernel.sem=1250 256000 128 1024" >> /etc/sysctl.conf
sysctl -p /etc/sysctl.conf

Is it correct?

How to make sure those changes are in effect?

Thanks,

Gulam.

Re: Changing Linux Kernel Parameter without rebooting box.

Court Campbell — Fri, 02 Nov 2007 10:34:01 GMT

cat /proc/sys/kernel/sem

Re: Changing Linux Kernel Parameter without rebooting box.

skt_skt — Fri, 02 Nov 2007 12:41:53 GMT

# sysctl -a|grep -i sem
kernel.sem = 250 32000 32 128

Re: Changing Linux Kernel Parameter without rebooting box.

rajdev — Fri, 02 Nov 2007 23:39:17 GMT

Hi,

What you did is correct, its working in my system.

Try to put the values directly to /proc/sys/kernel/sem

echo "1250 256000 128 1024" > /proc/sys/kernel/sem
[ but this will not survive a reboot !!]

then check
sysctl -a |grep sem

if the value is still old, then there is some other issues.

Regards,
RD

Re: Changing Linux Kernel Parameter without rebooting box.

Andrew Cowan — Sat, 03 Nov 2007 11:55:09 GMT

The easiest way to survive a reboot is to add the value to "/etc/sysctl.conf" or to add the statement to "/etc/rc.local".

Re: Changing Linux Kernel Parameter without rebooting box.

Steven E. Protter — Sun, 04 Nov 2007 03:01:00 GMT

Shalom,

All current kernel values are written to the /proc/sys/kernel directory.

To see if an in the fly change has been effected check there.

sysctl -a

SEP