Sakura VPS

I installed nginx
If i hit the IP, the CENTOS page will be displayed.

For example
1.1.1.1 or
1.1.1.1/index.html

Even if both IPs are entered, the following is displayed.

By the way
1.1.1.1/indexhtml
As above, dare before html. If i delete the URL and hit the URL
An nginx error message is displayed.

There is no index.html file.

sudo systemctl start nginx

has been implemented.

sudo systemctl status nginx

This is the error I'm interested in. Failed to parse PID from file /run/nginx.pid: Invalid argument

The result is:

$sudo systemctl status nginx

• nginx.service-The nginx HTTP and reverse proxy server
  Loaded: loaded (/usr/lib/systemd/system/nginx.service;enabled;vendor preset: disabled)
  Active: active (running) since Tue 2019-11-26 17:33:47 JST;49min ago
  Main PID: 9123 (nginx)
  CGroup: /system.slice/nginx.service
  | -1919 nginx: master process/usr/sbin/nginx
  `-1818 nginx: worker process

Starting The nginx HTTP and reverse proxy server ...
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
Failed to parse PID from file /run/nginx.pid: Invalid argument
Started The nginx HTTP and reverse proxy server.

How can I display the following normal nginx top page?