Linux Open File Number problem

Too many open files

The reason for this is that the number of file/socket connections that the program opens exceeds the system setting.

To view the maximum allowable number of open files per user

Ulimit-a

fdipzone@ubuntu:~$ ulimit-a  
Core file size          (blocks,-c) 0  
data seg size           (Kbytes,-D) Unlimited  
Scheduling Priority             (-E)  
file size               (blocks,-f) Unlimited pending signals (-I                 ) 16382  
Max Locked Memory       (Kbytes, L)  
max memory size         (Kbytes, m) Unlimited  
open files (-                      N) 1024  
Pipe Size            (bytes, p) 8  
POSIX message Queues     (bytes,-q) 819200  
real-time Priority              (-R) 0  
stack size< c24/> (Kbytes,-s) 8192  
CPU time               (seconds,-T) unlimited  
max User Processes              (-u) Unlimited  
Virtual Memory          (Kbytes,-V) unlimited  
file Locks                      (-X) Unlimited

where open files (-N) 1024 indicates that the maximum number of files allowed for each user is 1024

View the number of files currently open on the system

lsof | Wc-l  
Watch "lsof | Wc-l "

View the number of open files for a process

Lsof-p PID | Wc-l  
lsof-p 1234 | wc-l

Set the open files numeric method

Ulimit-n 2048

fdipzone@ubuntu:~$ ulimit-n 2048  
fdipzone@ubuntu:~$ ulimit-a  
core file size          (blocks,-c) 0  
data seg siz E           (Kbytes,-D) unlimited  
scheduling priority             (-E)  
file size               (blocks,-f) Unlimited  
Pending Signals                 (i) 16382  
max locked Memory (Kbytes,-       L)  
max memory size         (Kbytes, M) Unlimited  
open Files                      (-N) 2048  
pipe Size            (bytes, p) 8  
POSIX message Queues     (bytes,- Q) 819200  
real-time Priority              (-R) 0  
stack size              (Kbytes,-s) 8192  
CPU time               (seconds,-t) Unlimited  
max User Processes              (-u) unlimited  
virtual memory          (Kbytes,-V) unlimited  
file locks                      (x) Unlimited

This sets the maximum allowable number of open files for the current user to 2048, but this setting is restored to the default value after the reboot.

Permanent Settings method

Vim/etc/security/limits.conf  
in the last addition  
* Soft nofile 4096  
* Hard nofile 4096

The top * represents all users and can set a user as needed, such as

Fdipzone soft nofile 8192  
fdipzone hard Nofile 8192

After the change, the cancellation will be effective.

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