How to fix “Too many open files” issue

1. Check the current global limitatoins
   ulimit -a

2. Find the pid of target process

ps -ef|grep allproxy

3.0 View the amount of files of process:

ls /proc/926/fd | wc -l

3. View the open files of target proces

3. Change open files value

ulimit -n 20480

4. restart process

5. The above method only works for current sytem, it will missing when restart the server, so we have to change system files

vim /etc/security/limits.conf

add the following content in the end:

* soft nofile 20480

* hard nofile 20480

root soft nproc 204800

root hard nproc 204800

1. Change /etc/supervisor/supervisord.conf, add “minfds=XXX” under [supervisord]

• Restart supervisor

Global Configuration

Temporarily Increase Global File Descriptor Limit (total number of file descriptors that can be created by all processes)

• View global file descriptor limit: cat /proc/sys/fs/file-max
  
• Configure:  ：echo 1000000 > /proc/sys/fs/file-max
• Takes effect immediately after configuration

Permanently Increase Global File Descriptor Limit

• Edit configuration file /etc/sysctl.conf, add the following line at the end: fs.file-max=1000000
  
• Make the configuration file take effect: sysctl -p
  

Special Note:

• The per-process file descriptor limit must not exceed the global file descriptor limit!!! I encountered a situation where I carelessly set the per-process limit higher than the global limit, which led to being unable to boot up and login afterwards!!!