do changes in /etc/security/limits.conf require a reboot?
No but you should close all active sessions windows. They still remember the old values. In other words, log out and back in. Every remote new session or a local secure shell take effect of the limits changes.
Apply the changes directly to a running process if you have prlimit installed (comes with util-linux-2.21)
prlimit --pid <pid> --<limit>=<soft>:<hard>
for example
prlimit --pid 12345 --nofile=1024:2048
Refer here
To temporarily set the open files limit for the user you are currently logged in under (e.g. 'root'):You can also use the ulimit
command to change the values in your current shell. However, hard limits can only be adjusted downwards unless you're root.
Example:
# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 62449
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 1024
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
To change the nofile
to 94000 you can do:
ulimit -n 94000