accept4() failed (24: Too many open files)

nginx添加如下配置然后reload一下就好了:

worker_rlimit_nofile 655350;

worker_connections  60000;    # 需要小于或等于  worker_rlimit_nofile 

2019/12/14 20:24:12 [alert] 2642#2642: setrlimit(RLIMIT_NOFILE, 65535) failed (1: Operation not permitted)

setsebool -P httpd_setrlimit 1

https://www.linuxquestions.org/questions/centos-111/nginx-setrlimit-operation-not-permitted-4175599913/

kernel: TCP: request_sock_TCP: Possible SYN flooding on port 9000. Sending cookies.  Check SNMP counters.

[alert] 1319#1319: 1024 worker_connections are not enough

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