Proxy nginx to another nginx and then to application

Question

i have following setup.

Network A Nginx / SSL

Network B App1/preprod (keycloak preprod, wildfly preprod, database preprod)

Network C Nginx /SSL

Network D App1/test (keycloak test, wildflys test, database test)

Communication:

A <-> B
A <-> C
C <-> D

I am trying to:

NGINX A -> APP 1 preprod --- that is ok
NGINX A -> NGINX C -> APP 1 test --- that's what i am tryng to figure out.

Problem is that keycloak which is on APP1 test need to get request from NGINX A URL and not from NGINX C.

I appriciate your help,

Alan

Answer 1

It's little bit difficult to understand actual problem here.

I assume you should dig into http headers while passing through nginx. You could pass same Host header even hostname does not resolve to Nginx C. Just use upstream in proxy_pass and set proxy_set_header Host parameter with desired value.