If you see error messages like:
nginx: [warn] 4096 worker_connections exceed open file resource limit: 1024
Then checking nginx web server configuration using command:
# service nginx configtest
It can be fixed permanently (after system reboot) by editing /etc/security/limits.conf configuration file:
#@student - maxlogins 4 * soft nofile 65536 * hard nofile 65536 # End of file
Default Linux system limits can be viewed using command:
# 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) 14586
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) 14586
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
To fix open files limit value temporary (it works until server reboot) use command:
# ulimit -n 65536
To view new values of system limits run once again:
# 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) 14586
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 65536
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) 14586
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
Then checking nginx web server configuration use command:
# service nginx configtest
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
And, finally, restart nginx web server using command:
# service nginx restart
Stopping nginx: [ OK ]
Starting nginx: [ OK ]
#
