When you’re creating load balancing configurations in NGINX, sometimes you are going to want to route traffic from a certain IP address to a different set of upstream nodes. This may be because you have a CI environment which uses the same load balancer (staging) or could be for other reasons.
Regardless, create your alternative upstream:
upstream defaultNodes {
server 192.168.1.1; # default nodes...
}
upstream alternativeNodes {
server 192.168.1.100; # new nodes...
}
Then in the server directive, add the condition (assuming the public IP you want to route is 100.0.0.1):
location / {
proxy_pass http://defaultNodes/;
if ( $remote_addr ~* 100.0.0.1 ) {
proxy_pass http://alternativeNodes;
}
}