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Full Discussion: How to check what are the current kernel parameter settings
Top Forums UNIX for Advanced & Expert Users How to check what are the current kernel parameter settings Post 302436701 by newbie_01 on Tuesday 13th of July 2010 01:40:44 AM
Old 07-13-2010
How to check what are the current kernel parameter settings
Hi all,

I have four (4) different UNIX flavours and I want to know whether the following commands are correct with respect to wanting to check on what are my current kernel parameter settings.

I just want to clear the doubts hanging over my head whether the commands below are the right ones or not.

Any feedback will be very much appreciated. Thanks in advance.

BTW, I've found the following command via Google and just want to confirm if they are correct.

HP-UX = kctune
- seems right, I managed to run it alright and query the settings for max_thread_proc by running kctune -q max_thread_proc.

Solaris = check /etc/system ( ???? )
- can't find this file. The Solaris that am supporting is using a SUN cluster, does that mean the settings on another file. I have root access but I don't support the cluster, another vendor does but I need to know the kernel settings from time to time as I want to put it in a script as a historical record in case someone changes some settings.

Linux = check /etc/sysctl.conf
- seems correct, did a more of the file and it got some kernel settings, mostly memory settings

AIX = ???
- this is very confusing, a link that I found, how to set kernel parameter values in aix (3rd Response) - Toolbox for IT Groups, said I have to use lsattr -El sys0. I just want confirmation that this is right?
- Based on System Specific Parameters, this is the right command
 

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LEARN ABOUT ULTRIX

systemd-sysctl.service

SYSTEMD-SYSCTL.SERVICE(8)				      systemd-sysctl.service					 SYSTEMD-SYSCTL.SERVICE(8)

NAME

       systemd-sysctl.service, systemd-sysctl - Configure kernel parameters at boot

SYNOPSIS

       /lib/systemd/systemd-sysctl [OPTIONS...] [CONFIGFILE...]

       systemd-sysctl.service

DESCRIPTION

       systemd-sysctl.service is an early boot service that configures sysctl(8) kernel parameters by invoking /lib/systemd/systemd-sysctl.

       When invoked with no arguments, /lib/systemd/systemd-sysctl applies all directives from configuration files listed in sysctl.d(5). If one
       or more filenames are passed on the command line, only the directives in these files are applied.

       In addition, --prefix= option may be used to limit which sysctl settings are applied.

       See sysctl.d(5) for information about the configuration of sysctl settings. After sysctl configuration is changed on disk, it must be
       written to the files in /proc/sys before it takes effect. It is possible to update specific settings, or simply to reload all
       configuration, see Examples below.

OPTIONS

       --prefix=
	   Only apply rules with the specified prefix.

       -h, --help
	   Print a short help text and exit.

       --version
	   Print a short version string and exit.

EXAMPLES

       Example 1. Reset all sysctl settings

	   systemctl restart systemd-sysctl

       Example 2. View coredump handler configuration

	   # sysctl kernel.core_pattern
	   kernel.core_pattern = |/libexec/abrt-hook-ccpp %s %c %p %u %g %t %P %I

       Example 3. Update coredump handler configuration

	   # /lib/systemd/systemd-sysctl --prefix kernel.core_pattern

       This searches all the directories listed in sysctl.d(5) for configuration files and writes /proc/sys/kernel/core_pattern.

       Example 4. Update coredump handler configuration according to a specific file

	   # /lib/systemd/systemd-sysctl 50-coredump.conf

       This applies all the settings found in 50-coredump.conf. Either /etc/sysctl.d/50-coredump.conf, or /run/sysctl.d/50-coredump.conf, or
       /usr/lib/sysctl.d/50-coredump.conf will be used, in the order of preference.

       See sysctl(8) for various ways to directly apply sysctl settings.

SEE ALSO

       systemd(1), sysctl.d(5), sysctl(8),

systemd 237														 SYSTEMD-SYSCTL.SERVICE(8)
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