https://habr.com/ru/company/srg/blog/462967/
-----df -ih
Use below command to find out how many file descriptors are currently being utilized:
[root@ansible ~]# more /proc/sys/fs/file-nr 1216 0 100000
vi /etc/sysctl.conf >> fs.file-max = 262144
ulimit -a
soft nofile 65536
hard nofile 65536
sysctl -w fs.file-max=262144