[Ingress] Service/Upstream name in the log

[edouardKaiser]

Is there a way to get the service (or upstream) name logged in the NGINX log_format ?

We are trying to export the NGINX logs into Elasticsearch, but we are only interested by the logs of particular applications. Right now, it's all mixed, there's no way to differentiate which pod/service is targeted. Sure, the targeted upstream address gets logged, but that does not help to process the log.

[aledbf]

@edouardKaiser no because nginx does not provide a variable with that information.
Please use a custom template with this changes:

diff --git a/ingress/controllers/nginx/nginx.tmpl b/ingress/controllers/nginx/nginx.tmpl
index f88d559..ccedb7d 100644
--- a/ingress/controllers/nginx/nginx.tmpl
+++ b/ingress/controllers/nginx/nginx.tmpl
@@ -75,7 +75,7 @@ http {

     log_format upstreaminfo '{{ if $cfg.useProxyProtocol }}$proxy_protocol_addr{{ else }}$remote_addr{{ end }} - '
         '[$proxy_add_x_forwarded_for] - $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent" '
-        '$request_length $request_time $upstream_addr $upstream_response_length $upstream_response_time $upstream_status';
+        '$request_length $request_time [$proxy_upstream_name] $upstream_addr $upstream_response_length $upstream_response_time $upstream_status';

     {{/* map urls that should not appear in access.log */}}
     {{/* http://nginx.org/en/docs/http/ngx_http_log_module.html#access_log */}}
@@ -262,6 +262,7 @@ http {
             {{- end }}

             {{- buildProxyPass $location }}
+            set $proxy_upstream_name "{{ $location.Upstream.Name }}";
         }
         {{ end }}

[edouardKaiser]

Works like a charm, thanks. I'm surprised no one was missing that information in the logs.

[aledbf]

@edouardKaiser awesome. This change will be included in the next release.