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nbari
Asked: 2017-09-03 02:40:09 +0800 CST

Nginx resolver per location

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What are the pros/cons of using a resolver per location, I found this configuration on a server but my guess is that it not "re-resolving" since the proxy_pass is not also using a variable

location /foo {
    proxy_pass http://foo_backends;
    resolver 10.0.0.2 valid=300s;
    resolver_timeout 10s;
}

location /bar {
    proxy_pass http://bar_backends;
    resolver 10.0.0.2 valid=300s;
    resolver_timeout 10s;
}

From the docs:

When you use a variable to specify the domain name in the proxy_pass directive, NGINX re‑resolves the domain name when its TTL expires.

Therefore if I am right the previous configuration could be rewritten like this:

resolver 10.0.0.2 valid=300s;
resolver_timeout 10s;

location /foo {
    set $foo_backend_servers foo_backends.example.com;
    proxy_pass http://$foo_backend_servers;
 }

location /bar {
    set $bar_backend_servers bar_backends.example.com;
    proxy_pass http://$bar_backend_servers;
 }

Is this correct or there is some trick when using location per location? could it be that by using a resolver per location there is no need to create a variable and pass it to proxy_pass?

nginx

0 Answers