nginx error log shows "Too many open files"
Issue
- under certain load conditions following message could be seen in nginx's error log file: "Too many open files"
- what are the best practices in settings limit for nginx
- [crit] 3349415#0: accept4() failed (24: Too many open files)
- [alert] 3349415#0: *670683 socket() failed (24: Too many open files) while connecting to upstream, client: x.x.x.x, server: abc.redhat.com,
Environment
- Red Hat Enterprise Linux 8/9
- nginx web server 1.18/120
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