Linux Kernel Config Scopes within VM or Hypervisor Post: 303030901

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Operating Systems Linux Linux Kernel Config Scopes within VM or Hypervisor Post 303030901 by freedombird9 on Tuesday 19th of February 2019 01:35:40 AM

02-19-2019

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Linux Kernel Config Scopes within VM or Hypervisor

In production we're going to deploy a redis server and need to set the overcommit_memory and disable Transparent Huge Pages in Kernel.

The issue is currently we only have one giant server, and it is to be shared by many other apps. We only want those kernel configs in the redis server. I wonder if we can achieve it by spinning up a dedicated VM for redis. Doing so in docker certainly doesn't make sense.　My questions are:

Will those Kernel configs take actual effect in the redis VM even if the host OS doesn't have the same configs?　I doubt it since the hardware resource is allocated by the host machine in the end.
Will the kernel config in the redis VM affect other VMs that run other apps? I think it won't, just want to confirm.
To achieve the goal, what kind of VM or hypervisor should we use?

If there's no way to do it in VM, is having a separate server (hardware) for redis the only way to go?

Last edited by RavinderSingh13; 02-19-2019 at 06:47 AM..

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chcpu

CHCPU(8)							   User Manuals 							  CHCPU(8)

NAME

       chcpu - configure CPUs

SYNOPSIS

       chcpu [-e] [-d] [-c] [-g] cpu-list
       chcpu [-p] mode
       chcpu -r
       chcpu [-h] [-V]

DESCRIPTION

       chcpu  can  modify  the state of CPUs.  It can enable or disable CPUs, scan for new CPUs, change the CPU dispatching mode of the underlying
       hypervisor, and request CPUs from the hypervisor (configure) or return CPUs to the hypervisor (deconfigure).

       Some options have a cpu-list argument.  Use this argument to specify a comma-separated list of CPUs.  The list can contain  individual  CPU
       addresses  or ranges of addresses.  For example, 0,5,7,9-11 makes the command applicable to the CPUs with the addresses 0, 5, 7, 9, 10, and
       11.

OPTIONS

       -r, --rescan
	      Trigger a rescan of CPUs.  Use this option on systems that do not automatically detect newly attached CPUs.  The Linux  kernel  then
	      recognizes the new CPUs.

       -c, --configure cpu-list
	      Configure  all specified CPUs.  Configuring a CPU means that the hypervisor takes a CPU from the CPU pool and assigns it to the vir-
	      tual hardware on which your kernel runs.

       -e, --enable cpu-list
	      Enable all specified CPUs.  Enabling a CPU means that the kernel sets it online.	A CPU must be configured, see -c, before it can be
	      enabled.

       -p, --dispatch mode
	      Set  the	CPU  dispatching mode (polarization).  This option has an effect only if your hardware architecture and hypervisor support
	      CPU polarization.  Available modes are:

		     horizontal  The workload is spread across all available CPUs.
		     vertical	 The workload is concentrated on few CPUs.

       -d, --disable cpu-list
	      Disable all specified CPUs.  Disabling a CPU means that the kernel sets it offline.

       -g, --deconfigure cpu-list
	      Deconfigure all specified CPUs.  Deconfiguring a CPU means that the hypervisor removes the CPU from the virtual  hardware  on  which
	      the Linux instance runs and returns it to the CPU pool.  A CPU must be offline, see -d, before it can be deconfigured.

       -h, --help
	      Display help information and exit.

       -V, --version
	      Display version information and exit.

AUTHOR

       Heiko Carstens <heiko.carstens@de.ibm.com>

COPYRIGHT

       Copyright IBM Corp. 2011

SEE ALSO

       lscpu(1)

AVAILABILITY

       The  chcpu command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util-
       linux/>.

Linux								     June 2012								  CHCPU(8)