Allow custom global configuration at multiple levels

controllers/nginx/configuration.md

@@ -537,6 +537,16 @@ Default: 9411
 **zipkin-service-name:** specifies the service name to use for any traces created
 Default: nginx
 
+**http-snippet:** adds custom configuration to the http section of the nginx configuration
+Default: ""
+
+**server-snippet:** adds custom configuration to all the servers in the nginx configuration
+Default: ""
+
+**location-snippet:** adds custom configuration to all the locations in the nginx configuration
+Default: ""
+
+
 ### Default configuration options
 
 The following table shows the options, the default value and a description.

controllers/nginx/pkg/config/config.go

@@ -391,6 +391,15 @@ type Configuration struct {
 	// ZipkinServiceName specifies the service name to use for any traces created
 	// Default: nginx
 	ZipkinServiceName string `json:"zipkin-service-name"`
+
+	// HTTPSnippet adds custom configuration to the http section of the nginx configuration
+	HTTPSnippet string `json:"http-snippet"`
+
+	// ServerSnippet adds custom configuration to all the servers in the nginx configuration
+	ServerSnippet string `json:"server-snippet"`
+
+	// LocationSnippet adds custom configuration to all the locations in the nginx configuration
+	LocationSnippet string `json:"location-snippet"`
 }
 
 // NewDefault returns the default nginx configuration

controllers/nginx/rootfs/etc/nginx/template/nginx.tmpl

@@ -281,6 +281,11 @@ http {
     proxy_pass_header Server;
     {{ end }}
 
+    {{ if not (empty $cfg.HTTPSnippet) }}
+    # Custom code snippet configured in the configuration configmap
+    {{ $cfg.HTTPSnippet }};
+    {{ end }}
+
     {{ range $name, $upstream := $backends }}
     {{ if eq $upstream.SessionAffinity.AffinityType "cookie" }}
     upstream sticky-{{ $upstream.Name }} {
@@ -394,6 +399,10 @@ http {
         server_name {{ $server.Alias }};
         {{ template "SERVER" serverConfig $all $server }}
 
+        {{ if not (empty $cfg.ServerSnippet) }}
+        # Custom code snippet configured in the configuration configmap
+        {{ $cfg.ServerSnippet }};
+        {{ end }}
 
         {{ template "CUSTOM_ERRORS" $all }}
     }
@@ -808,6 +817,11 @@ stream {
             {{/* Add any additional configuration defined */}}
             {{ $location.ConfigurationSnippet }}
 
+            {{ if not (empty $all.Cfg.LocationSnippet) }}
+            # Custom code snippet configured in the configuration configmap
+            {{ $all.Cfg.LocationSnippet }};
+            {{ end }}
+
             {{/* if we are sending the request to a custom default backend, we add the required headers */}}
             {{ if (hasPrefix $location.Backend "custom-default-backend-") }}
             proxy_set_header       X-Code             503;