apr_socket_recv: Connection reset by peer：
https://www.cnblogs.com/archoncap/p/5883723.html

ulimit解除: https://blog.51cto.com/853056088/2091839

2019/05/03 07:43:36 [crit] 27684#27684: accept4() failed (24: Too many open files):
worker_rlimit_nofile 51200;

selinux 解除：
2019/05/03 07:46:07 [alert] 43314#43314: setrlimit(RLIMIT_NOFILE, 10000) failed (1: Operation not permitted)
setsebool -P httpd_setrlimit 1

php开启opcache可以提升80%左右qps
[root@abcdocker ~]# tail /etc/php.ini 
zend_extension="opcache.so"