Linux system open files too many solutions

A. Permanent entry into force.
1./etc/pam.d/login Add
Session required/lib/security/pam_limits.so
2./etc/security/limits.conf Add
* Soft Nofile 65536
* Hard Nofile 65536
3.vi/etc/sysctl.conf Add
Fs.file-max = 6553600
two. Temporary entry into force.
ulimit-n 65536
or write the command to profile, executed every time you log on.
Three. Check whether it takes effect.
ulimit-a

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Linux system open files too many solutions