nginx redirect what is not coming from load balancing
- by dawez
I have nginx on SERVER1 that is acting as load balancing between SERVER1 and SERVER2
in SERVER1 I have the upstreams for the load balancing defined as :
upstream de.server.com { # similar upstreams defined also for other languages
# SELF SERVER1
server 127.0.0.1:8082 weight=3 max_fails=3 fail_timeout=2;
# other SERVER2
server otherserverip:8082 max_fails=3 fail_timeout=2;
}
The load balancing config on SERVER1 is this one:
server {
listen 80;
server_name ~^(?<LANG>de|es|fr)\.server\.com;
location / {
proxy_pass http://$LANG.server.com;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
# trying to pass a variable in the header to SERVER2
proxy_set_header Is-From-Load-Balancer 1;
}
}
Then in server 2 I have:
server {
listen 8082;
server_name localhost;
root /var/www/server.com/public;
# test output values
add_header testloadbalancer $http_is_from_load_balancer;
add_header testloadbalancer2 not_load_bal;
## other stuff here to process the request
}
I can see the "testloadbalancer" in the response header is set to 1 when the request is coming from the load balancing, it is not present when from a direct access: SERVER2:8082 .
I would like to bounce back to the SERVER1 all the direct requests that are sent to SERVER2, but keep the ones from the load balancing. So this should forbid direct access to SERVER2:8082 and redirect to SERVER1:80 .
