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By the way, there are some way can check and increase the maximum allowed files you can open at the same time on Centos.

Step-by-step guide

1. Find Linux Open File Limit

   Code Block
   # cat /proc/sys/fs/file-max 176772

   The number you will see shous the number of files that a user can have opened per login session. The result might be different depending on your system.

2. Check Hard Limit in Linux

   Code Block
   # ulimit -Hn 4096

   
   

3. Check Soft Limits in Linux

   Code Block
   # ulimit -Sn 1024

   
   

4. Set User Level Open File limits in Linux
   You may want to apply limits per user basis like apache, mysqld, and etc. For that purpose, as user root, you will need to edit the following file:

   Code Block
   # vi /etc/security/limits.conf

   To increase soft and hard limits, please add following lines at the end of the file.

   Code Block
   * hard nofile 500000 * soft nofile 500000 root hard nofile 500000 root soft nofile 500000

   Once you login the machine again, your soft/hard limits will be changed like you set above.

   
   

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