GNU/Linux Desktop Survival Guide
by Graham Williams
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GNU/Linux Desktop Survival Guide by Graham Williams |
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Kernel Parameters | 
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Next, we need to check some kernel parameters. Run the following
commands, check the output, and make the changes as required.
/sbin/sysctl -a | grep sem /sbin/sysctl -a | grep shm /sbin/sysctl -a | grep file-max /sbin/sysctl -a | grep ip_local_port_range |
kernel.sem = 250 32000 100 128 kernel.shmmni = 4096 kernel.shmall = 2097152 kernel.shmmax = 2147483648 fs.file-max = 65536 net.ipv4.ip_local_port_range = 1024 65000 |
If you need to change any of the values, open up /etc/sysctl.conf in
your favourite text editor (e.g., emacs21) and change the
appropriate entries as follows:
kernel.shmall = 2097152 kernel.shmmax = 2147483648 kernel.shmmni = 4096 kernel.sem = 250 32000 100 128 fs.file-max = 65536 net.ipv4.ip_local_port_range = 1024 65000 |
Run /sbin/sysctl -p to apply the changes (only if you changed something of course.)
Add the following lines to /etc/security/limits.conf file:
* soft nproc 2047 * hard nproc 16384 * soft nofile 1024 * hard nofile 65536 |
session required /lib/security/pam_limits.so |
Because we are using the Bash shell add the following lines to the
/etc/profile file:
if [ $USER = "oracle" ]; then
if [ $SHELL = "/bin/ksh" ]; then
ulimit -p 16384
ulimit -n 65536
else
ulimit -u 16384 -n 65536
fi
fi
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