>>Please show "uname -a", "nginx -V", and "ps -alxww | grep nginx"
>>output.

#uname -a
Linux localhost.localdomain 3.10.0-693.11.6.el7.x86_64 #1 SMP Thu Jan 4 01:06:37 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

#nginx -V
nginx version: nginx/1.14.0
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-16) (GCC)
built with OpenSSL 1.0.2k-fips 26 Jan 2017
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib64/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -fPIC' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -pie'


#ps -alxww | grep nginx
5 0 9613 1 20 0 48516 1352 sigsus Ss ? 0:00 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf
5 996 9614 9613 20 0 53204 7892 ep_pol S ? 1:35 nginx: worker process
5 996 9615 9613 20 0 53800 8476 ep_pol S ? 1:37 nginx: worker process
5 996 9616 9613 20 0 54888 9648 ep_pol S ? 1:56 nginx: worker process
5 996 9617 9613 20 0 53008 7696 ep_pol S ? 2:22 nginx: worker process
5 996 9618 9613 20 0 53452 8140 ep_pol S ? 2:12 nginx: worker process
5 996 9619 9613 20 0 55036 9712 ep_pol S ? 2:14 nginx: worker process
5 996 9620 9613 20 0 58700 13484 ep_pol S ? 2:18 nginx: worker process
5 996 9621 9613 20 0 55532 10316 ep_pol S ? 2:20 nginx: worker process
5 996 9622 9613 20 0 53504 8300 ep_pol S ? 2:18 nginx: worker process
5 996 9623 9613 20 0 53204 7892 ep_pol S ? 2:12 nginx: worker process
5 996 9624 9613 20 0 52196 6992 ep_pol S ? 2:32 nginx: worker process
5 996 9625 9613 20 0 57164 11944 ep_pol S ? 2:24 nginx: worker process
0 0 26753 26580 20 0 112648 964 pipe_w S+ pts/0 0:00 grep --color=auto nginx