feat: add initial load test

.gitignore

@@ -28,6 +28,7 @@ ut-coverage.xml
 
 # editor and IDE paraphernalia
 .idea
+.DS_Store
 *.swp
 *.swo
 *~

hack/loadtest/README.md

@@ -0,0 +1,22 @@
+Here is how to run the load test locally. Make sure that you have installed go and git clone the repo
+
+1. Build a fleet.
+
+You can use any Kubernetes clusters you have and install the fleet agents on those clusters. In this example, we built a fleet with four member clusters, namely, cluster-1 to cluster-4. 
+Please remember to save the kubeconfig file pointing to the hub cluster of the fleet. 
+
+3. Run the load test binary locally.
+```shell
+export KUBECONFIG=xxxxx
+go run hack/loadtest/main.go -max-current-placement 10 --cluster cluster-1 --cluster cluster-2 --cluster cluster-3 --cluster cluster-4 
+```
+
+3. Manually check the metrics against the load test.
+```shell
+curl http://localhost:4848/metrics | grep workload 
+```
+
+4. Use a local prometheus to draw graphs. Download prometheus binary for your local machine. Start the prometheus. 
+```shell
+./prometheus --config.file=hack/loadtest/prometheus.yml 
+```

hack/loadtest/main.go

@@ -0,0 +1,119 @@
+/*
+Copyright (c) Microsoft Corporation.
+Licensed under the MIT license.
+*/
+
+package main
+
+import (
+	"context"
+	"flag"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"k8s.io/apimachinery/pkg/runtime"
+	utilrand "k8s.io/apimachinery/pkg/util/rand"
+	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
+	"k8s.io/client-go/rest"
+	"k8s.io/klog/v2"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/client/config"
+	workv1alpha1 "sigs.k8s.io/work-api/pkg/apis/v1alpha1"
+
+	fleetv1alpha1 "go.goms.io/fleet/apis/v1alpha1"
+	"go.goms.io/fleet/hack/loadtest/util"
+)
+
+var (
+	scheme = runtime.NewScheme()
+)
+
+var (
+	placementDeadline   = flag.Int("placement-deadline-second", 300, "The deadline for a placement to be applied (in seconds)")
+	pollInterval        = flag.Int("poll-interval-millisecond", 250, "The poll interval for verification (in milli-second)")
+	maxCurrentPlacement = flag.Int("max-current-placement", 10, "The number of current placement load.")
+	loadTestLength      = flag.Int("load-test-length-minute", 15, "The length of the load test in miniutes.")
+	clusterNames        util.ClusterNames
+)
+
+func init() {
+	klog.InitFlags(nil)
+	utilrand.Seed(time.Now().UnixNano())
+
+	utilruntime.Must(clientgoscheme.AddToScheme(scheme))
+	utilruntime.Must(fleetv1alpha1.AddToScheme(scheme))
+	utilruntime.Must(workv1alpha1.AddToScheme(scheme))
+	//+kubebuilder:scaffold:scheme
+}
+
+func main() {
+	flag.Var(&clusterNames, "cluster", "The name of a member cluster")
+	flag.Parse()
+	defer klog.Flush()
+
+	klog.InfoS("start to run placement load test", "pollInterval", *pollInterval, "placementDeadline", *placementDeadline, "maxCurrentPlacement", *maxCurrentPlacement, "clusterNames", clusterNames)
+	config := config.GetConfigOrDie()
+	config.QPS, config.Burst = float32(100), 500
+	hubClient, err := client.New(config, client.Options{
+		Scheme: scheme,
+	})
+	if err != nil {
+		panic(err)
+	}
+	ctx := ctrl.SetupSignalHandler()
+	if err = util.ApplyClusterScopeManifests(ctx, hubClient); err != nil {
+		panic(err)
+	}
+	loadTestCtx, canFunc := context.WithDeadline(ctx, time.Now().Add(time.Minute*time.Duration(*loadTestLength)))
+	defer canFunc()
+	// run the loadtest in the background
+	go runLoadTest(loadTestCtx, config)
+	// setup prometheus server
+	http.Handle("/metrics", promhttp.Handler())
+	if err = http.ListenAndServe(":4848", nil); err != nil {
+		panic(err)
+	}
+}
+
+func runLoadTest(ctx context.Context, config *rest.Config) {
+	var wg sync.WaitGroup
+	wg.Add(*maxCurrentPlacement)
+	for i := 0; i < *maxCurrentPlacement; i++ {
+		go func() {
+			// each use a separate client to avoid client side throttling, start each client side with a jitter
+			// to avoid creating too many clients at the same time.
+			time.Sleep(time.Millisecond * time.Duration(utilrand.Intn(100**maxCurrentPlacement)))
+			hubClient, err := client.New(config, client.Options{
+				Scheme: scheme,
+			})
+			if err != nil {
+				panic(err)
+			}
+			defer wg.Done()
+			// continuously apply and delete resources
+			for {
+				select {
+				case <-ctx.Done():
+					return
+				default:
+					if err = util.MeasureOnePlacement(ctx, hubClient, time.Duration(*placementDeadline)*time.Second, time.Duration(*pollInterval)*time.Millisecond, *maxCurrentPlacement, clusterNames); err != nil {
+						klog.ErrorS(err, "placement load test failed")
+					}
+				}
+			}
+		}()
+	}
+	wg.Wait()
+	hubClient, _ := client.New(config, client.Options{
+		Scheme: scheme,
+	})
+	if err := util.CleanupAll(hubClient); err != nil {
+		klog.ErrorS(err, "clean up placement load test hit an error")
+	}
+	util.PrintTestMetrics()
+	klog.InfoS(" placement load test finished. For more metrics, please use prometheus")
+}

hack/loadtest/manifests/endpoint-slice.yaml

@@ -0,0 +1,17 @@
+apiVersion: discovery.k8s.io/v1
+kind: EndpointSlice
+metadata:
+  labels:
+    service-name: test-nginx-export
+  name: test-user-created-endpointslice
+  namespace: app
+addressType: IPv4
+ports:
+  - name: https
+    port: 443
+    protocol: TCP
+endpoints:
+  - addresses:
+      - 20.106.105.216
+    conditions:
+      ready: true

hack/loadtest/manifests/endpoints.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Endpoints
+metadata:
+  name: user-created-endpoint
+  namespace: app
+subsets:
+  - addresses:
+      - ip: 20.106.105.216
+    ports:
+      - name: https
+        port: 443
+        protocol: TCP

hack/loadtest/manifests/test-cloneset.yaml

@@ -0,0 +1,25 @@
+apiVersion: apps.kruise.io/v1alpha1
+kind: CloneSet
+metadata:
+  name: guestbook-clone
+  namespace: app
+spec:
+  replicas: 20
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: guestbook-clone
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: guestbook-clone
+    spec:
+      containers:
+        - name: guestbook
+          image: openkruise/guestbook:v1
+          imagePullPolicy: Always
+          ports:
+            - name: http-server
+              containerPort: 3000
+  updateStrategy:
+    type: InPlaceIfPossible
+    maxUnavailable: 3

hack/loadtest/manifests/test-configmap-2.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: test-configmap-2
+  namespace: app
+  labels:
+    fleet.azure.com/name: app
+data:
+  field1: one
+  field2: two
+  field3: three

hack/loadtest/manifests/test-configmap.yaml

@@ -0,0 +1,9 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: test-configmap
+  namespace: app
+data:
+  fielda: one
+  fieldb: two
+  fieldc: three

hack/loadtest/manifests/test-role.yaml

@@ -0,0 +1,9 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  namespace: app
+  name: test-pod-reader
+rules:
+  - apiGroups: [""] # "" indicates the core API group
+    resources: ["pods"]
+    verbs: ["get", "watch", "list"]

hack/loadtest/manifests/test-rolebinding.yaml

@@ -0,0 +1,17 @@
+apiVersion: rbac.authorization.k8s.io/v1
+# This role binding allows "jane" to read pods in the "default" namespace.
+# You need to already have a Role named "pod-reader" in that namespace.
+kind: RoleBinding
+metadata:
+  name: read-pods
+  namespace: app
+subjects:
+  # You can specify more than one "subject"
+  - kind: User
+    name: jane # "name" is case sensitive
+    apiGroup: rbac.authorization.k8s.io
+roleRef:
+  # "roleRef" specifies the binding to a Role / ClusterRole
+  kind: Role #this must be Role or ClusterRole
+  apiGroup: rbac.authorization.k8s.io
+  name: test-pod-reader # this must match the name of the Role or ClusterRole you wish to bind to

hack/loadtest/manifests/test-secret.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: test-secret
+  namespace: app
+data:
+  somekey: Q2xpZW50SWQ6IDUxOTEwNTY4LTM0YzktNGQ0ZS1iODA1LTNmNTY3NWQyMDdiYwpDbGllbnRTZWNyZXQ6IDZSLThRfkJvSDNNYm1+eGJpaDhmNVZibHBkWGxzeGQyRnp+WXhjWjYKVGVuYW50SWQ6IDcyZjk4OGJmLTg2ZjEtNDFhZi05MWFiLTJkN2NkMDExZGI0NwpTdWJzY3JpcHRpb25JZDogMmIwM2JmYjgtZTg4NS00NTY2LWE2MmEtOTA5YTExZDcxNjkyClJlc291cmNlR3JvdXA6IGNhcmF2ZWwtZGVtbw==
+type: generic

hack/loadtest/manifests/test-service.yaml

@@ -0,0 +1,27 @@
+# Copyright 2021 The Kubernetes Authors.
+#
+# 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.
+
+apiVersion: v1
+kind: Service
+metadata:
+  name: test-nginx
+  namespace: app
+  labels:
+    run: test-nginx
+spec:
+  ports:
+    - port: 80
+      protocol: TCP
+  selector:
+    run: test-nginx