nginx force nginx to resolve dns - error 9#9 recv() (failed connection refused)

kevin

4/6/23, 5:14 PM

I have a hostname like this: https://abc.xyz.com

I want to force resolve the dns everytime a request arrives, because if the dns of abc.xyz.com changes i want nginx to still be able to proxy to the site, therefore need to resolve the dns again.

Now i followed this post How to force nginx to resolve DNS (of a dynamic hostname) everytime when doing proxy_pass? and my configuration looks like this

server {
    ...
    resolver abc.xyz.com;
    set $backend "http://abc.xyz.com";
    proxy_pass $backend;
    ...
}

And i get this error [error] 9#9 recv() failed (111: connection refused) while resolving, resolver: <some-dns>:53

I don't understand what i'm doing wrong here, i guess it has something to do with the resolver. The only difference is that the guy in the post put dns there 127.0.0.1. I don't think i want to do that since dns/ip can change when i redploy my app and i saw you can give resolver a hostname but it doesn't work and i get this error.

Any help would be appreatiated!

292

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domain-name-system

nginx

Score:0

Server

Tero Kilkanen

4/6/23, 5:37 PM

The resolver tells which DNS recursive server is used to resolve the domain name. You need to point it to your DNS server's IP address.

0 + 0

kevin

4/6/23, 5:45 PM

so if im understanding correcty, my application is not the dns server? and i need to figure out my dns-server's hostname (like dns-server.dns.com) or their dns( im assuming their dns doesnt change)?

Tero Kilkanen

4/6/23, 6:19 PM

You need to add your DNS resolver's IP address to the directive.

kevin

4/6/23, 6:42 PM

do you know where/how do I find that? sorry if its obvious and im stupid

Tero Kilkanen

4/6/23, 10:30 PM

You need to ask your hosting provider what are their DNS addresses.

kevin

4/7/23, 7:32 PM

i did, and it works, thanks!

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: nginx force nginx to resolve dns - error 9#9 recv() (failed connection refused)

TH: nginx บังคับให้ nginx แก้ไข DNS - ข้อผิดพลาด 9#9 recv() (การเชื่อมต่อล้มเหลวถูกปฏิเสธ)

RO: nginx forțează nginx să rezolve dns - eroare 9#9 recv() (conexiune eșuată refuzată)

RU: nginx заставляет nginx разрешать DNS - ошибка 9 # 9 recv () (отказ в неудачном соединении)

VI: nginx buộc nginx giải quyết dns - lỗi 9#9 recv() (không kết nối bị từ chối)

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