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First post - kernel params in VMware

Good morning, all!

I have several RHEL machines of various builds (4AS U4, 5.2, 6.o) running in a VMware environment. I inherited this infrastructure and want to verify if some kernel params have been configured for these virtual machines.

In VMware KB 1006427 there are some recommended/required parameters to be passed to the kernel to ensure timekepeping is correct and tidy.

Is there a way to see what params have been passed to the kernel at boot? Can I make these params permanent?

Many thanks in advance!

Gregg

You can see kernel parameters in /proc or by using sysctl.

Code:

sysctl -a

^ Displays all kernel parameters

If you want to set one permanently, change it in the /etc/sysctl.conf file. The file does not include all parameters so you might need to add it to set it. Once file is updated for it to take effect run:

Code:

sysctl -p

It will spit out all of the kernel parameters being set by that file. You can also reboot the box to update the changes.

If you just want to set a parameter on the fly use:

Code:

sysctl -w parameter.name=parameterValue

Setting it on the fly will not stick after a reboot though.