01-19-2019
Linux uses memory very efficiently, so if you have 32GB of RAM, you are in great shape for most applications. Linux will allocate to active processes and deallocate memory to idle processes as required.
To use "less RAM" as you ask, you need to manage the running processes.
Best is to look at the memory allocated "per process" and not only the "free memory" stats you posted.
Hope this helps.
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LEARN ABOUT CENTOS
new-kernel-pkg
NEW-KERNEL-PKG(8) System Manager's Manual NEW-KERNEL-PKG(8)
NAME
new-kernel-pkg - tool to script kernel installation
SYNOPSIS
new-kernel-pkg [-v] [--mkinitrd] [--rminitrd] [--dracut]
[--initrdfile=initrd-image [--depmod] [--rmmoddep]
[--kernel-args=args] [--remove-args=args]
[--banner=banner] [--multiboot=multiboot]
[--mbargs=mbargs] [--make-default] [--add-dracut-args]
[--add-plymouth-initrd] [--host-only]
<--install | --remove | --update | --rpmposttrans> <kernel-version>
DESCRIPTION
new-kernel-pkg is a tool used in packaging to automate the installation of a new kernel, including the creation of an initial ram filesys-
tem image, updating of bootloader configuration, and other associated tasks.
OPTIONS
-v Be verbose.
--mkinitrd
Create a new initial ram filesystem image.
--rminitrd
Remove an initial ram filesystem image.
--dracut
When creating a new initial ram filesystem image, use dracut(8) rather than mkinitrd(8). Used in conjunction with --mkinitrd .
--initrdfile=initrd-image
Use the specified file as the initial ram filesystem image.
--depmod
Create modules.dep and related files.
--rmmoddep
Remove modules.dep and related files.
--kernel-args=args
Use args as the boot command line for this kernel.
--remove-args=args
Remove specified kernel arguments for this kernel.
--banner=banner
Display banner as the banner text in the bootloader.
--multiboot=multiboot-image
Use multiboot-image as a multiboot image.
--mbargs=mbargs
Use mbargs as arguments to the multiboot image.
--make-default
Make this kernel the default boot option.
--add-dracut-args
Automatically generate dracut options and add them to the kernel command line.
--add-plymouth-initrd
Automatically add plymouth to the initial ram filesystem image.
--host-only
Make an initial ram filesystem image that is specific to the running system.
--install kernel-version
Install a new kernel.
--remove kernel-version
Remove an installed kernel.
--update kernel-version
Update the specified kernel.
--rpmposttrans kernel-version
Run the rpmposttrans for the specified kernel.
SEE ALSO
grubby(8) installkernel(8)
AUTHORS
Erik Troan
Jeremy Katz
Peter Jones
Wed Apr 14 2010 NEW-KERNEL-PKG(8)