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I'm trying to configure nginx as a reverse proxy for two websites on the same server. This is what I'm doing:

upstream alpha { server localhost:49212; } server { listen 80; server_name alpha.example.com; location / { proxy_pass http://alpha; } } upstream beta { server localhost:49213; } server { listen 80; server_name beta.example.com; location / { proxy_pass http://beta; } } server { listen 80; server_name ""; return 444; }

It starts and doesn't complain about anything. Then, when I open alpha.example.com or beta.example.com - I always end up at http://localhost:49212. Moreover, no matter what URL I open on port 80, http://localhost:49212 is rendered.

This is not what I'd expect. I want only http://alpha.example.com to be redirected/proxied to http://localhost:49212 and nothing else. Looks like nginx doesn't pay attention to the Host HTTP header and just redirects everything to the first upstream.

What is wrong?

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  • Have you restarted nginx? Check carefully for typos in server_name Commented Jul 29, 2015 at 11:24
  • Yes, restarted, checked for typos... Commented Jul 29, 2015 at 11:57
  • What is serving the sites? Commented Jul 29, 2015 at 16:52
  • A few Docker containers with Apache+PHP inside Commented Jul 29, 2015 at 17:07
  • I cross-posted this (similar) problem here: unix.stackexchange.com/questions/219094/… Commented Jul 29, 2015 at 17:13

1 Answer 1

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OK, here is the answer. The server with an empty server_name has to be declared as a "default" one. More details here: http://nginx.org/en/docs/http/ngx_http_core_module.html#server_name

Nginx, when Host HTTP header doesn't match any servers, goes into the default one, which is the first, if not specified otherwise. Here is the config that works:

upstream alpha { server localhost:49212; } server { listen 80; server_name alpha.example.com; location / { proxy_pass http://alpha; } } upstream beta { server localhost:49213; } server { listen 80; server_name beta.example.com; location / { proxy_pass http://beta; } } server { listen 80 default_server; # pay attention! server_name ""; return 444; }
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