Create nginx systemd file

create file : /lib/systemd/system/nginx.service with below content: 

[Unit]

Description=The NGINX HTTP and reverse proxy server

After=syslog.target network-online.target remote-fs.target nss-lookup.target

Wants=network-online.target

[Service]

Type=forking

PIDFile=/run/nginx.pid

ExecStartPre=/usr/sbin/nginx -t

ExecStart=/usr/sbin/nginx

ExecReload=/usr/sbin/nginx -s reload

ExecStop=/bin/kill -s QUIT $MAINPID

PrivateTmp=true

[Install]

WantedBy=multi-user.target

then run :

systemctl daemon-reload && systemctl enable nginx && systemctl start nginx 

Done !