Redirect subdomain to port [nginx/flask]

Question

I know that this is a common question, and there are answers for the same, but the reason I ask this question is because I do not know how to approach the solution. Depending on the way I decide to do it, the solution I can pick changes. Anyways,

I have an AWS EC2 instance. My DNS is handled by Route53 and I own example.com. Currently, on my instance, there are two services running:

example.com:80 [nginx/php/wordpress]
example.com:8142 [flask]

What I want to do is, make app.example.com point to example.com:8142 . How exactly do I go about doing this? I am pretty sure that I will have to point app.example.com to the same IP as example.com , since it is the same box that will be serving it. And, nginx will be the first one to handle these requests at port 80. Is there a way with which I can make nginx forward all requests to localhost:8142?

Is there a better way that I can solve this problem?

Answer 1

You could add a virtual host for app.example.com that listens on port 80 then proxy pass all requests to flask:

server {
    listen 80;
    server_name app.example.com;

    location / {
        proxy_pass http://localhost:8142;
    }   
}

Answer 2

This is how you would do it with apache.

$cat /etc/apache2/sites-available/app.conf
<VirtualHost *:80>
    ServerName app.example.com
    ProxyPreserveHost On
    <Proxy *>
        Order allow,deny
        Allow from all
    </Proxy>
    ProxyPass / http://localhost:8142/
    ProxyPassReverse / http://localhost:8142/
</VirtualHost>

Answer 3

You can redirect your domain to a certain port. This depends on the web service you are using -Nginx/Apache. If you are using Nginx, you'll need to do add a server block to your Nginx's website config. This can be achieved by using the bellow

location /{
    proxy_pass  http://127.0.0.1:8142/;
}

If you are using Apache, you have two options, the first one is to add a redirection rule in your website's .htaccess and the second one would be to do it directly in the Apache's Vhost file. I like using the first option. In your .htaccess file, you can add the following rule

RewriteEngine on

# redirect to 3000 if current port is not 3000 and "some-prefix/" is matched
RewriteRule ^/(.*[^/])/?$ http://blabla:3000/$1/ [R=301,L]

If you want to use Apache's Vhost file, I'll recommend going through the following tutorial link

Answer 4

I have ubuntu 16 and nginx with two NodeJS instances, one for front, one for admin. In, I have: /etc/nginx/sites-available/default

I've added:

server { ... location / { proxy_pass http://127.0.0.1:8001; }

location /admin {
    rewrite ^/admin(.*) /$1 break;
    proxy_pass http://127.0.0.1:8002;
}

location /other {
    rewrite ^/other(.*) /$1 break;
    proxy_pass http://127.0.0.1:8003;
}
...

}

I've used this to have access for admin.