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

生产环境因为并发量突然增大，导致系统登录页面刷新、访问失败报500

查看nginx后台错误日志，发现频繁打印accept4() failed (24: Too many open files)

[yunwei@nginx ~]# tail -f /usr/local/openresty/nginx/logs/error.log
2022/11/21 08:40:36 [alert] 28808#28808: *57325374 socket() failed (24: Too many open files) while connecting to upstream, client: 172.25.100.227, server: , request: "POST /nginx/api/data/nginxDataCheck HTTP/1.1", upstream: "http://10.30.40.56:8009/data/nginxDataCheck", host: "172.25.102.126:20002"
2022/11/21 08:40:36 [crit] 28808#28808: accept4() failed (24: Too many open files)
2022/11/21 08:40:37 [alert] 28808#28808: *57325398 socket() failed (24: Too many open files) while connecting to upstream, client: 172.25.100.227, server: , request: "POST /nginx/api/data/nginxDataCheck HTTP/1.1", upstream: "http://10.30.40.56:8009/data/nginxDataCheck", host: "172.25.102.126:20002"
2022/11/21 08:40:37 [crit] 28808#28808: accept4() failed (24: Too many open files)

原因：日志里的接口也是合法的，外人是不可能访问的，大概率是nginx的系统配置没有优化，大并发访问时nginx性能堵塞

解决方法：修改vi /etc/nginx/conf/nginx.conf配置文件

#允许使用cpn数量
worker_processes 4;

events {

#进程数
worker_connections 2048;
}
#进程最大打开文件数
worker_rlimit_nofile 65536;

 

#重启加载nginx

nginx -s reload