Detailed explanation on how to modify the default port of nginx

First find out where the configuration file is

whereis nginx.conf 

You can look through these directories to see where the configuration files are. The correct directory here is /etc/nginx

Next, find the real configuration file

cd to the /etc/nginx directory

When I opened it, I was confused. Where was the line "listen 80"?

But don’t worry, listen 80 is definitely there, it’s just not included here. Look, isn't there an include file? Who knows in there.

OK, then go and see what's in the sites-enabled folder

Well, this file points to site-available/default again
default file is opened, um... yes, it is

But develop a good habit and back up before modifying

cp default default_backup
Errata: This should be cp default ../default_backup, otherwise when including, the * in this directory will be used, and the backup will also be treated as a configuration file

Generally, 80 is changed to 81, but it can be changed to something else.
The next step is to restart nginx. But you will find that nginx cannot access it, that is because port 81 is not open, you can refer to my other blog post Remote Server Modification Port

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