Ulimit-shn 65535 meaning

In Linux, use ulimit to set the maximum number of connections. The default value is 1024.
You must set it to a higher value under high load, but the maximum value is 65535.

Ulimit can only be modified temporarily and becomes invalid after restart.
Can join
Ulimit-shn 65535
To/Etc/rc. LocalEnable each startup.

The maximum number of processes and maximum number of files opened in Linux is lifted:
Vim/Etc/security/limits. conf
# Add the following rows
* Soft nproc 11000
* Hard nproc 11000
* Soft nofile 655350
* Hard nofile 655350