Allow gzip compression level to be controlled via ConfigMap

docs/user-guide/nginx-configuration/configmap.md

@@ -87,6 +87,7 @@ The following table shows a configuration option's name, type, and the default v
 |[brotli-level](#brotli-level)|int|4|
 |[brotli-types](#brotli-types)|string|"application/xml+rss application/atom+xml application/javascript application/x-javascript application/json application/rss+xml application/vnd.ms-fontobject application/x-font-ttf application/x-web-app-manifest+json application/xhtml+xml application/xml font/opentype image/svg+xml image/x-icon text/css text/plain text/x-component"|
 |[use-http2](#use-http2)|bool|"true"|
+|[gzip-level](#gzip-level)|int|5|
 |[gzip-types](#gzip-types)|string|"application/atom+xml application/javascript application/x-javascript application/json application/rss+xml application/vnd.ms-fontobject application/x-font-ttf application/x-web-app-manifest+json application/xhtml+xml application/xml font/opentype image/svg+xml image/x-icon text/css text/plain text/x-component"|
 |[worker-processes](#worker-processes)|string|`<Number of CPUs>`|
 |[worker-cpu-affinity](#worker-cpu-affinity)|string|""|
@@ -486,6 +487,10 @@ _**default:**_ `application/xml+rss application/atom+xml application/javascript
 
 Enables or disables [HTTP/2](http://nginx.org/en/docs/http/ngx_http_v2_module.html) support in secure connections.
 
+## gzip-level
+
+Sets the gzip Compression Level that will be used. _**default:**_ 5
+
 ## gzip-types
 
 Sets the MIME types in addition to "text/html" to compress. The special value "\*" matches any MIME type. Responses with the "text/html" type are always compressed if `use-gzip` is enabled.

internal/ingress/controller/config/config.go

@@ -350,6 +350,9 @@ type Configuration struct {
 	// Default: true
 	UseHTTP2 bool `json:"use-http2,omitempty"`
 
+	// gzip Compression Level that will be used
+	GzipLevel int `json:"gzip-level,omitempty"`
+
 	// MIME types in addition to "text/html" to compress. The special value “*” matches any MIME type.
 	// Responses with the “text/html” type are always compressed if UseGzip is enabled
 	GzipTypes string `json:"gzip-types,omitempty"`
@@ -553,6 +556,7 @@ func NewDefault() Configuration {
 		HSTSMaxAge:                 hstsMaxAge,
 		HSTSPreload:                false,
 		IgnoreInvalidHeaders:       true,
+		GzipLevel:                  5,
 		GzipTypes:                  gzipTypes,
 		KeepAlive:                  75,
 		KeepAliveRequests:          100,

internal/ingress/controller/template/configmap_test.go

@@ -63,6 +63,7 @@ func TestMergeConfigMapToStruct(t *testing.T) {
 		"error-log-path":                "/var/log/test/error.log",
 		"use-gzip":                      "true",
 		"enable-dynamic-tls-records":    "false",
+		"gzip-level":                    "9",
 		"gzip-types":                    "text/html",
 		"proxy-real-ip-cidr":            "1.1.1.1/8,2.2.2.2/24",
 		"bind-address":                  "1.1.1.1,2.2.2.2,3.3.3,2001:db8:a0b:12f0::1,3731:54:65fe:2::a7,33:33:33::33::33",
@@ -81,6 +82,7 @@ func TestMergeConfigMapToStruct(t *testing.T) {
 	def.ProxySendTimeout = 2
 	def.EnableDynamicTLSRecords = false
 	def.UseProxyProtocol = true
+	def.GzipLevel = 9
 	def.GzipTypes = "text/html"
 	def.ProxyRealIPCIDR = []string{"1.1.1.1/8", "2.2.2.2/24"}
 	def.BindAddressIpv4 = []string{"1.1.1.1", "2.2.2.2"}

rootfs/etc/nginx/template/nginx.tmpl

@@ -169,7 +169,7 @@ http {
 
     {{ if $cfg.UseGzip }}
     gzip on;
-    gzip_comp_level 5;
+    gzip_comp_level {{ $cfg.GzipLevel }};
     gzip_http_version 1.1;
     gzip_min_length 256;
     gzip_types {{ $cfg.GzipTypes }};