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cputime unlimited
filesize unlimited
datasize unlimited
stacksize 8192 kbytes
coredumpsize 0 kbytes
memoryuse unlimited
descriptors 1024
memorylocked unlimited
maxproc 8146
openfiles 1024
The openfiles and descriptors show a limit of 1024. To increase the limit to 65535 for all
users, edit /etc/security/limits.conf as root, and modify or add the nofile setting
(number of le) entries:
* soft nofile 65535
* hard nofile 65535
The character “*” is a wildcard that identies all users. You could also specify a user ID instead.
Then edit /etc/pam.d/login and add the line:
session required /lib/security/pam_limits.so
On Red Hat, you also need to edit /etc/pam.d/sshd and add the following line:
session required /lib/security/pam_limits.so
On many systems, this procedure will be sucient. Log in as a regular user and try it before
doing the remaining steps. The remaining steps might not be required, depending on how
pluggable authentication modules (PAM) and secure shell (SSH) are congured.
Virtual Memory
To change virtual memory settings, add the following to /etc/rc.local:
echo 100 1200 128 512 15 5000 500 1884 2 > /proc/sys/vm/bdflush
For more information, view the man pages for bdflush.
For HADB settings, refer to
Chapter 6, “Tuning for High-Availability.”
TuningforLinuxplatforms
Chapter5 • Tuningthe OperatingSystemand Platform 101