How to change the 'open file' for root permanently?

thomas2004ch · 11-23-2009, 06:31 AM

I will increase the number of 'open file' for root from default (1024) to 5000. I did first as follow:

Code:

ulimit -n 5000

Seems working. But as I login again the number returns to 1024. It seems in this way the number cannot be changed permanently.

Then I try edit the /etc/security/limits.conf as follow:

Code:

#<domain>      <type>  <item>         <value>
root             -     nofile       5000

But it doesn't work. The number is still 1024 as I list it with ulimit -a

Someone has idea?

vishesh · 11-23-2009, 06:52 AM

Does following line mentioned in /etc/pam.d/system-auth
---------------
session required pam_limits.so

------------
If above line is not present then system will not use /etc/security/limits.conf

Thanks

thomas2004ch · 11-23-2009, 07:07 AM

Quote:

Originally Posted by vishesh

Does following line mentioned in /etc/pam.d/system-auth
---------------
session required pam_limits.so

------------
If above line is not present then system will not use /etc/security/limits.conf

Here is my /etc/pam.d/system-auth. The system uses /etc/security/limits.conf

Code:

[root@s003ap06 root]# grep session /etc/pam.d/system-auth
session     required      /lib/security/$ISA/pam_limits.so
session     required      /lib/security/$ISA/pam_unix.so

Besides, if I set following in '/etc/security/limits.conf', the number of 'open file' for user1 is changed. This confirms the system uses etc/security/limits.conf. I wonder why it doesn't work for root

Code:

#<domain>      <type>  <item>         <value>
user1             -     nofile       5000