Adding an integration test for cadvisor.

test/e2e/cadvisor.go

@@ -0,0 +1,54 @@
+/*
+Copyright 2015 Google Inc. 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.
+*/
+
+package e2e
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
+
+	. "github.com/onsi/ginkgo"
+)
+
+var _ = Describe("Cadvisor", func() {
+	var c *client.Client
+
+	BeforeEach(func() {
+		var err error
+		c, err = loadClient()
+		expectNoError(err)
+	})
+
+	It("cadvisor should be healthy on every node.", func() {
+		CheckCadvisorHealthOnAllNodes(c)
+	})
+})
+
+func CheckCadvisorHealthOnAllNodes(c *client.Client) {
+	By("getting list of nodes")
+	nodeList, err := c.Nodes().List()
+	expectNoError(err)
+	for _, node := range nodeList.Items {
+		// cadvisor is not accessible directly unless its port (4194 by default) is exposed.
+		// Here, we access '/stats/' REST endpoint on the kubelet which polls cadvisor internally.
+		statsResource := fmt.Sprintf("api/v1beta1/proxy/minions/%s/stats/", node.Name)
+		By(fmt.Sprintf("Querying stats from node %s using url %s", node.Name, statsResource))
+		_, err = c.Get().AbsPath(statsResource).Timeout(1 * time.Second).Do().Raw()
+		expectNoError(err)
+	}
+}