nginx报错:socket() failed (24: Too many open files) while connecting to upstream

nginx反代新项目,在线人数过多时就会报错,查看日志,报错如下:
socket() failed (24: Too many open files) while connecting to upstream
解决办法
1.修改linux打开文件句柄数,编辑/etc/security/limits.conf,添加
* soft nofile 204800
* hard nofile 204800
2.修改nginx打开文件数, 编辑nginx.conf,添加worker_rlimit_nofile值
worker_processes 1;
worker_rlimit_nofile 20480;
3.重启nginx后解决
./nginx -s stop
./nginx
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