Configure virtual host:
You can refer to my blog: http://xxgblog.com/2015/05/17/nginx-start/ 4. Virtual host

server {
    listen 80 default_server;
    server_name _;
    return 444; # 过滤其他域名的请求，返回444状态码
}
server {
    listen 80;
    server_name www.aaa.com; # www.aaa.com域名
    location / {
        proxy_pass http://localhost:8080; # 对应端口号8080
    }
}
server {
    listen 80;
    server_name www.bbb.com; # www.bbb.com域名
    location / {
        proxy_pass http://localhost:8081; # 对应端口号8081
    }
}

Each website runs a different port and then reverse-proxyes to each port through the domain name
For example,
abc.com is in 3001
xyz.com is in 3002

nginx runs 80 and reverse proxy to 3001 and 3002 according to the domain name

The idea is here, the specific configuration of the search engine

It is to configure different servers, and then server_name corresponds to the domain name of the website.

A vhost profile can be set up for each website. You can use port 80.

Add vhost