NGINX with "serverpool" as the LB for DIFFERENT DOMAINS on same Apache Servers?

Question

I have nginx as a LB. And the 2 Apaches as the web servers. Lets say i got different domains:

www.example.com
checkout.example.com

Both domains will be in same 2 Apache Servers. But ofcoz under the different directories. And with the different VHost files on the Apache vhost file.

As something like below design:

          Nginx
            |
      -------------
      |           |
   Apache       Apache

Below is my current existing Nginx .conf file which is not working for the second Domain (checkout.example.com).

From NGINX (mysites.conf):

upstream serverpool {
  server 1.2.3.101:80 weight=1;
  server 1.2.3.102:80 weight=1;
}

server {
  listen 80;
  server_name www.example.com checkout.example.com;
  location / {
    proxy_pass http://serverpool;
  }
}

From both of 2 Apache Servers' same Vhost Files (httpd.conf):

<VirtualHost *:80>
   ServerName www.example.com
   DocumentRoot /var/www/html/www.example.com/
</VirtualHost>
<VirtualHost *:80>
   ServerName checkout.example.com
   DocumentRoot /var/www/html/checkout.example.com/
</VirtualHost>

But whenever i browse that (http://checkout.example.com), the Domain still comes up in browser .. but with the contents of (www.example.com), which is totally wrong.

What did i do wrong please?

`proxy_set_header Host $host;`. See http://nginx.org/r/proxy_set_header — Alexey Ten, Mar 02 '15 at 09:57
Where to put please? Or can you mentioned as in the answer, pls? — 夏期劇場, Mar 02 '15 at 09:58

score 1 · Accepted Answer · answered Mar 02 '15 at 10:03

You should almost always set Host header. Otherwise nginx falls back to default proxy_set_header Host $proxy_host; which in your case would be serverpool which is useless for apache.

See http://nginx.org/r/proxy_set_header and http://nginx.org/r/proxy_pass for details.

upstream serverpool {
  server 1.2.3.101:80 weight=1;
  server 1.2.3.102:80 weight=1;
}

server {
  listen 80;
  server_name www.example.com checkout.example.com;
  location / {
    proxy_pass http://serverpool;
    proxy_set_header Host $host;
  }
}

score 1 · Answer 2 · edited Apr 13 '17 at 12:14

you will need to send HOST: header to your upstream server IP's also

this artical is fully ansering to question

Make nginx to pass hostname of the upstream when reverseproxying

also you nginx config should looks like this

    upstream serverpool {
  server 1.2.3.101:80 weight=1;
  server 1.2.3.102:80 weight=1;
}

server {
  listen 80;
  server_name www.example.com checkout.example.com;
  location / {
    proxy_pass http://serverpool;
    proxy_set_header Host $host;
  }
}

NGINX with "serverpool" as the LB for DIFFERENT DOMAINS on same Apache Servers?

2 Answers2