[contrib + e2e] prometheus: add pushgateway functionality to prometheus allinone deployment along w/ runRC Gauge reporting.

contrib/prometheus/README.md

@@ -29,18 +29,23 @@ Looks open enough :).
 
 ## Prometheus 
 
-You can launch prometheus easily, by simply running.
+You can launch prometheus, promdash, and pushgateway easily, by simply running.
 
 `kubectl create -f contrib/prometheus/prometheus-all.json`
 
-Then (edit the publicIP field in prometheus-service to be a public ip on one of your kubelets), 
+This will launch the pushgateway such that prometheus is collecting metrics from it automatically.
 
-and run 
+NOTE: If you plan to use the push gateway to push metrics (for example, we use it in e2e tests) 
 
-`kubectl create -f contrib/prometheus/prometheus-service.json`
+you will want to have a stable IP that you can provide the push gateway from, and you may need to modify the NodePort stuff for your cloud provider.   
+
+And then, create corresponding services, like this.. note that the pushgateway service may/may not be functional, but we leave it in for good measure.
+
+`kubectl create -f contrib/prometheus/prometheus-service.json ; kubectl create -f contrib/prometheus/pushgateway-service.json`
 
 Now, you can access the service `wget 10.0.1.89:9090`, and build graphs.
 
+
 ## How it works
 
 This is a v1 api based, containerized prometheus ReplicationController, which scrapes endpoints which are readable on the KUBERNETES service (the internal kubernetes service running in the default namespace, which is visible to all pods).
@@ -73,7 +78,6 @@ at port 9090.
 
 - We should publish this image into the kube/ namespace.
 - Possibly use postgre or mysql as a promdash database.
-- push gateway (https://github.com/prometheus/pushgateway) setup.
 - stop using kubectl to make a local proxy faking the old RO port and build in
   real auth capabilities.
 

contrib/prometheus/prometheus-all.json

@@ -21,8 +21,8 @@
             "spec": {
                 "containers": [
                     {
-                        "name":"kube-promdash",
                         "image": "prom/promdash",
+                        "name": "kube-promdash",
                         "env": [
                             {
                                 "name": "DATABASE_URL",
@@ -44,15 +44,14 @@
                         ]
                     },
                     {
-                        "command": ["./run_prometheus.sh", "-t", "KUBERNETES_RO", "-d", "/var/prometheus/"],
                         "image": "jayunit100/kube-prometheus",
                         "name": "kube-prometheus",
-                        "ports": [
-                            {
-                                "containerPort": 9090,
-                                "hostPort": 9090,
-                                "protocol": "TCP"
-                            }
+                        "command": [
+                            "./run_prometheus.sh",
+                            "-t",
+                            "KUBERNETES_RO,PUSHGATEWAY",
+                            "-d",
+                            "/var/prometheus/"
                         ],
                         "env": [
                             {
@@ -62,6 +61,21 @@
                             {
                                 "name": "KUBERNETES_RO_SERVICE_PORT",
                                 "value": "8001"
+                            },
+                            {
+                                "name": "PUSHGATEWAY_SERVICE_HOST",
+                                "value": "localhost"
+                            },
+                            {
+                                "name": "PUSHGATEWAY_SERVICE_PORT",
+                                "value": "9091"
+                            }
+                        ],
+                        "ports": [
+                            {
+                                "containerPort": 9090,
+                                "hostPort": 9090,
+                                "protocol": "TCP"
                             }
                         ],
                         "volumeMounts": [
@@ -72,12 +86,26 @@
                         ]
                     },
                     {
-                        "name": "kubectl",
+                        "image": "jayunit100/prompush:0.2.0",
+                        "name": "pushgateway",
+                        "ports": [
+                            {
+                                "containerPort": 9091,
+                                "hostPort": 9091,
+                                "protocol": "TCP"
+                            }
+                        ]
+                    },
+                    {
                         "image": "gcr.io/google_containers/kubectl:v0.18.0-350-gfb3305edcf6c1a",
+                        "name": "kubectl",
                         "args": [
-                            "proxy", "-p", "8001", "--api-prefix=/"
+                            "proxy",
+                            "-p",
+                            "8001",
+                            "--api-prefix=/"
                         ]
-                    }
+                     }
                 ],
                 "volumes": [
                     {

contrib/prometheus/pushgateway-service.json

@@ -0,0 +1,22 @@
+{
+    "kind":"Service",
+    "apiVersion":"v1",
+    "metadata":{
+        "name":"pushgateway",
+        "labels":{
+            "name":"pushgateway"
+        }
+    },
+    "spec":{
+        "type": "NodePort",
+        "ports": [
+        {
+            "port":9091,
+            "targetPort":9091,
+                "protocol":"TCP"
+        }],
+        "selector":{
+            "name":"kube-prometheus"
+        }
+    }
+}

test/e2e/e2e_test.go

@@ -80,6 +80,7 @@ func init() {
 	flag.StringVar(&cloudConfig.ClusterTag, "cluster-tag", "", "Tag used to identify resources.  Only required if provider is aws.")
 	flag.IntVar(&testContext.MinStartupPods, "minStartupPods", 0, "The number of pods which we need to see in 'Running' state with a 'Ready' condition of true, before we try running tests. This is useful in any cluster which needs some base pod-based services running before it can be used.")
 	flag.StringVar(&testContext.UpgradeTarget, "upgrade-target", "latest_ci", "Version to upgrade to (e.g. 'latest_stable', 'latest_release', 'latest_ci', '0.19.1', '0.19.1-669-gabac8c8') if doing an upgrade test.")
+	flag.StringVar(&testContext.PrometheusPushGateway, "prom-push-gateway", "", "The URL to prometheus gateway, so that metrics can be pushed during e2es and scraped by prometheus. Typically something like 127.0.0.1:9091.")
 }
 
 func TestE2E(t *testing.T) {

test/e2e/prompush.go

@@ -0,0 +1,68 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+//This is a utility for prometheus pushing functionality.
+package e2e
+
+import (
+	"fmt"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// Prometheus stuff: Setup metrics.
+var runningMetric = prometheus.NewGauge(prometheus.GaugeOpts{
+	Name: "e2e_running",
+	Help: "The num of running pods",
+})
+
+var pendingMetric = prometheus.NewGauge(prometheus.GaugeOpts{
+	Name: "e2e_pending",
+	Help: "The num of pending pods",
+})
+
+// Turn this to true after we register.
+var prom_registered = false
+
+// Reusable function for pushing metrics to prometheus.  Handles initialization and so on.
+func promPushRunningPending(running, pending int) error {
+
+	if testContext.PrometheusPushGateway == "" {
+		Logf("Ignoring prom push, push gateway unavailable")
+		return nil
+	} else {
+		// Register metrics if necessary
+		if !prom_registered && testContext.PrometheusPushGateway != "" {
+			prometheus.Register(runningMetric)
+			prometheus.Register(pendingMetric)
+			prom_registered = true
+		}
+		// Update metric values
+		runningMetric.Set(float64(running))
+		pendingMetric.Set(float64(pending))
+
+		// Push them to the push gateway.  This will be scraped by prometheus
+		// provided you launch it with the pushgateway as an endpoint.
+		if err := prometheus.Push(
+			"e2e",
+			"none",
+			testContext.PrometheusPushGateway, //i.e. "127.0.0.1:9091"
+		); err != nil {
+			fmt.Println("failed at pushing to pushgateway ", err)
+			return err
+		}
+	}
+	return nil
+}

test/e2e/util.go

@@ -103,18 +103,19 @@ type CloudConfig struct {
 }
 
 type TestContextType struct {
-	KubeConfig     string
-	KubeContext    string
-	CertDir        string
-	Host           string
-	RepoRoot       string
-	Provider       string
-	CloudConfig    CloudConfig
-	KubectlPath    string
-	OutputDir      string
-	prefix         string
-	MinStartupPods int
-	UpgradeTarget  string
+	KubeConfig            string
+	KubeContext           string
+	CertDir               string
+	Host                  string
+	RepoRoot              string
+	Provider              string
+	CloudConfig           CloudConfig
+	KubectlPath           string
+	OutputDir             string
+	prefix                string
+	MinStartupPods        int
+	UpgradeTarget         string
+	PrometheusPushGateway string
 }
 
 var testContext TestContextType
@@ -1141,6 +1142,9 @@ func RunRC(config RCConfig) error {
 
 		Logf("%v %v Pods: %d out of %d created, %d running, %d pending, %d waiting, %d inactive, %d unknown ",
 			time.Now(), rc.Name, len(pods), config.Replicas, running, pending, waiting, inactive, unknown)
+
+		promPushRunningPending(running, pending)
+
 		if config.PodStatusFile != nil {
 			fmt.Fprintf(config.PodStatusFile, "%s, %d, running, %d, pending, %d, waiting, %d, inactive, %d, unknown\n", time.Now(), running, pending, waiting, inactive, unknown)
 		}