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Old 03-17-2017, 02:23 PM   #1
fanoflq
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Registered: Nov 2015
Posts: 397

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CentOS7: Unable to persistently set kernel parameter


This is for learning only on CentOS7.
Code:
I have edited config file for 
1) cat /etc/sysctl.d/01-swappiness.conf		#I named this file.
	vm.swappiness = 31
2) cat /etc/sysctl.conf				#default config
	vm.swappiness = 35

#At reboot time, I have this resuly.
#Original kernel parameter value is vm.swappiness=30
# sysctl  vm.swappiness
vm.swappiness = 30

#Notice above, the vm.swappiness is not from 
/etc/sysctl.d/01-swappiness.conf	 
or 
/etc/sysctl.conf

#But at runtime, I am able to load the sysctl config file:
# sysctl -p /etc/sysctl.d/01-swappiness.conf                                             
vm.swappiness = 31

#Check result
# sysctl  vm.swappiness                                                                  
vm.swappiness = 31

#I am able to load the default sysctl config file:                                                               
# sysctl -p /etc/sysctl.conf 
vm.swappiness = 35

#Check result
# sysctl  vm.swappiness
vm.swappiness = 35
So what is overriding the custom settings in
/etc/sysctl.conf and /etc/sysctl.d/01-swappiness.conf ?
 
Old 03-17-2017, 06:18 PM   #2
michaelk
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Registered: Aug 2002
Posts: 19,552

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It is being configured by tuned

https://www.centos.org/forums/viewtopic.php?t=55678
https://wiki.mikejung.biz/CentOS_7
 
1 members found this post helpful.
Old 03-17-2017, 06:26 PM   #3
fanoflq
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Registered: Nov 2015
Posts: 397

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Quote:
Originally Posted by michaelk View Post
Thank you.
 
  


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