ulimit example

[root@server conf]# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
pending signals (-i) 1024
max locked memory (kbytes, -l) 32
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 4095
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

[root@server conf]# ulimit -a | grep files
open files (-n) 1024

Change (example of increasing to 5000 files):

ulimit -n 5000