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question asked: Feb 17 '16, 5:10 p.m.
question was seen: 2,433 times
last updated: Feb 17 '16, 6:55 p.m.

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How to avoid starting up WAS at boot time on Linux with system default nofile 1024 instead of set value 65536 in  /etc/security/limits.conf ?

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long TRUONG (365●4●118●146) | asked Feb 17 '16, 5:10 p.m.
 We are to switch our CLM (RTC/RRC) 5.0.2 from Windows/Tomcat to Linux/WAS: While planning we found "Important: If you use a system startup script such as /etc/init.d/was or /etc/rc.*/SXXWebSphere to start WebSphere® Application Server at system boot up time, init.d invokes the startup scripts with the maximum number of file descriptors set to 1024 instead of the system default value that is set in /etc/security/limits.conf (65536). To avoid this problem, after a system boot up, manually run /etc/init.d/was restart from a root shell. This will ensure that WebSphere Application Server is restarted with the correct file descriptor limit."

Would it be effective to modify the OOTB WAS startup script to start with logging in to our service account (with su - svc_clm) before executing the rest of the script, to avoid the manual restart step? (Obvious that we have no previous experience installing WAS or CLM with WAS though our CLM was switched from Linux/WAS to Windows/Tomcat in 2013 for internal convenience)

At that time nofile was set (on the old server):
* hard nofile 65536
* soft nofile 65536

but nproc was not set as required now to:
* hard nproc 10000
* soft nproc 10000

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Michael Afshar (701●4) | answered Feb 17 '16, 5:23 p.m.
JAZZ DEVELOPER
 You can add the command ulimit -n 65536 to the top of your startup script. 

Hope that helps,
Michael
long TRUONG selected this answer as the correct answer
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long TRUONG commented Feb 17 '16, 6:54 p.m. | edited Feb 17 '16, 6:55 p.m.

 Thx Michael,


Ah! the old ulimit. My shell scripting must be rusted: didn't realize that nofile is set for open files, off Unix too long on Windows. Vaguely remember doing something similar for Clearcase on AIX.

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