ngx_http_upstream_jdomain_module: resolver failed, "xxxxx.web.com" (110: Operation timed out)

[zhongcy]

ERROR:

2025/02/11 17:33:42 [error] 205#0: ngx_http_upstream_jdomain_module: resolver failed, "xxxxx.web.com" (110: Operation timed out)
2025/02/11 17:33:42 [error] 207#0: unexpected DNS response for xxxxx.web.com
2025/02/11 17:33:43 [error] 207#0: unexpected DNS response for xxxxx.web.com
2025/02/11 17:33:44 [error] 207#0: unexpected DNS response for xxxxx.web.com

conf:
use default resolver_timeout :
`Default: | resolver_timeout 30s;

upstream xxx {jdomain xxxxx.web.com interval=60; keepalive 8;}

`

jdomain code :
logic is in :

ngx_upstream_jdomain/src/ngx_http_upstream_jdomain_module.c

Line 295 in 6c0cc3a

/* Determine if there was an error and if so, should we mark the instance as down or not */

/* Determine if there was an error and if so, should we mark the instance as down or not */
	if (ctx->state || ctx->naddrs == 0) {
		instance->state.data.server->down =
		  exists_alt_server && (instance->conf.strict || ctx->state == NGX_RESOLVE_FORMERR || ctx->state == NGX_RESOLVE_NXDOMAIN);
		ngx_log_error((instance->state.data.server->down ? NGX_LOG_WARN : NGX_LOG_ERR),
		              ctx->resolver->log,
		              0,
		              "ngx_http_upstream_jdomain_module: resolver failed, \"%V\" (%i: %s)",
		              &ctx->name,
		              ctx->state,
		              ngx_resolver_strerror(ctx->state));
		if (!instance->state.data.server->down) {
			goto end;
		}
	}

why jdomain have this error?

[zhongcy]

https://github.com/nginx/nginx/blob/master/src/core/ngx_resolver.c

"unexpected DNS response for" error

[zhongcy]

@nicholaschiasson can you check it?

[nicholaschiasson]

Hi @zhongcy , can you provide a bit more well formatted details?

• Can you show a more complete nginx config, not just the upstream block and resolver_timeout?
  • What are you using for resolver for example?
• You have made sure your xxxxx.web.com resolves through the resolver you have configured on the host you're testing?
• Are you able to run a debug build and provide log output? Even without a debug build, log output might still be helpful here.

Also note that some time in the coming year, I will be archiving this repo since the (better) feature is coming to nginx stable release. See #88

[zhongcy]

OK, thanks for share this infos,
I think about to use new nginx stable release later

[nicholaschiasson]

I will close this issue then. Thank you!