[DISCUS] How to resolve domain names into IP addresses in an upstream at run-time like Tengine?

[Lang Wang]

Hi community,

ngx_http_upstream_dynamic_module provides the functionality to resolve
domain names into IP addresses in an upstream at run-time.
via doc: http://tengine.taobao.org/document/http_upstream_dynamic.html
config samples like:

upstream backend {
    dynamic_resolve fallback=stale fail_timeout=30s;
    server a.com;
    server b.com;
}
server {
    ...
    location / {
        proxy_pass http://backend;
    }
}

So how to enable this feature in apisix or apisix based on tengine?
What about add `dynamic_resolve fallback=stale fail_timeout=30s;` in
nginx.conf

        upstream apisix_backend {
            server 0.0.0.1;
            balancer_by_lua_block {
                apisix.http_balancer_phase()
            }

+           dynamic_resolve fallback=stale fail_timeout=30s;
            keepalive 320;
        }