root@ubuntu-instance:/var/log/nginx# ulimit -n 8388608
bash: ulimit: open files: cannot modify limit: Operation not permitted
root@ubuntu-instance:/var/log/nginx# sysctl -w fs.file-max=92233720368
fs.file-max = 92233720368
root@ubuntu-instance:/var/log/nginx# sysctl -w fs.nr_open=8388608
fs.nr_open = 8388608
root@ubuntu-instance:/var/log/nginx# ulimit -n 8388608
root@ubuntu-instance:/var/log/nginx#