Add support for jaeger backend (#1916)

docs/user-guide/configmap.md

@@ -94,6 +94,11 @@ The following table shows a configuration option's name, type, and the default v
 |[zipkin‑collector‑host](#zipkin-collector-host)|string|""|
 |[zipkin‑collector‑port](#zipkin-collector-port)|int|9411|
 |[zipkin‑service‑name](#zipkin-service-name)|string|"nginx"|
+|[jaeger‑collector‑host](#jaeger-collector-host)|string|""|
+|[jaeger‑collector‑port](#jaeger-collector-port)|int|6831|
+|[jaeger‑service‑name](#jaeger-service-name)|string|"nginx"|
+|[jaeger‑sampler‑type](#jaeger-sampler-type)|string|"const"|
+|[jaeger‑sampler‑param](#jaeger-sampler-param)|string|"1"|
 |[http‑snippet](#http-snippet)|string|""|
 |[server‑snippet](#server-snippet)|string|""|
 |[location‑snippet](#location-snippet)|string|""|
@@ -554,6 +559,27 @@ Specifies the port to use when uploading traces. Default: 9411
 
 Specifies the service name to use for any traces created. Default: nginx
 
+## jaeger-collector-host
+
+Specifies the host to use when uploading traces. It must be a valid URL.
+
+## jaeger-collector-port
+
+Specifies the port to use when uploading traces. Default: 6831
+
+## jaeger-service-name
+
+Specifies the service name to use for any traces created. Default: nginx
+
+## jaeger-sampler-type
+
+Specifies the sampler to be used when sampling traces. The available samplers are: const, probabilistic, ratelimiting, remote. Default const.
+
+## jaeger-sampler-param
+
+Specifies the argument to be passed to the sampler constructor. Must be a number.
+For const this should be 0 to never sample and 1 to always sample. Default: 1
+
 ## http-snippet
 
 Adds custom configuration to the http section of the nginx configuration.

internal/ingress/controller/config/config.go

@@ -423,6 +423,25 @@ type Configuration struct {
 	// Default: nginx
 	ZipkinServiceName string `json:"zipkin-service-name"`
 
+	// JaegerCollectorHost specifies the host to use when uploading traces
+	JaegerCollectorHost string `json:"jaeger-collector-host"`
+
+	// JaegerCollectorPort specifies the port to use when uploading traces
+	JaegerCollectorPort int `json:"jaeger-collector-port"`
+
+	// JaegerServiceName specifies the service name to use for any traces created
+	// Default: nginx
+	JaegerServiceName string `json:"jaeger-service-name"`
+
+	// JaegerSamplerType specifies the sampler to be used when sampling traces.
+	// The available samplers are: const, probabilistic, ratelimiting, remote
+	// Default: const
+	JaegerSamplerType string `json:"jaeger-sampler-type"`
+
+	// JaegerSamplerParam specifies the argument to be passed to the sampler constructor
+	// Default: 1
+	JaegerSamplerParam string `json:"jaeger-sampler-param"`
+
 	// HTTPSnippet adds custom configuration to the http section of the nginx configuration
 	HTTPSnippet string `json:"http-snippet"`
 
@@ -524,6 +543,10 @@ func NewDefault() Configuration {
 		BindAddressIpv6:              defBindAddress,
 		ZipkinCollectorPort:          9411,
 		ZipkinServiceName:            "nginx",
+		JaegerCollectorPort:          6831,
+		JaegerServiceName:            "nginx",
+		JaegerSamplerType:            "const",
+		JaegerSamplerParam:           "1",
 	}
 
 	if glog.V(5) {

rootfs/etc/nginx/template/nginx.tmpl

@@ -19,6 +19,10 @@ load_module /etc/nginx/modules/ngx_http_opentracing_module.so;
 load_module /etc/nginx/modules/ngx_http_zipkin_module.so;
 {{ end }}
 
+{{ if (and $cfg.EnableOpentracing (ne $cfg.JaegerCollectorHost "")) }}
+load_module /etc/nginx/modules/ngx_http_jaeger_module.so;
+{{ end }}
+
 daemon off;
 
 worker_processes {{ $cfg.WorkerProcesses }};
@@ -105,9 +109,14 @@ http {
     {{ end }}
 
     {{ if (and $cfg.EnableOpentracing (ne $cfg.ZipkinCollectorHost "")) }}
-    zipkin_collector_host           {{ $cfg.ZipkinCollectorHost }};
+    zipkin_collector_host                   {{ $cfg.ZipkinCollectorHost }};
-    zipkin_collector_port           {{ $cfg.ZipkinCollectorPort }};
+    zipkin_collector_port                   {{ $cfg.ZipkinCollectorPort }};
-    zipkin_service_name             {{ $cfg.ZipkinServiceName }};
+    zipkin_service_name                     {{ $cfg.ZipkinServiceName }};
+    {{ else if (and $cfg.EnableOpentracing (ne $cfg.JaegerCollectorHost "")) }}
+    jaeger_reporter_local_agent_host_port   {{ $cfg.JaegerCollectorHost }}:{{ $cfg.JaegerCollectorPort }};
+    jaeger_service_name                     {{ $cfg.JaegerServiceName }};
+    jaeger_sampler_type                     {{ $cfg.JaegerSamplerType }};
+    jaeger_sampler_param                    {{ $cfg.JaegerSamplerParam }};
     {{ end }}
 
     include /etc/nginx/mime.types;