Add logs generator

hack/.linted_packages

@@ -223,6 +223,7 @@ test/images/clusterapi-tester
 test/images/entrypoint-tester
 test/images/fakegitserver
 test/images/goproxy
+test/images/logs-generator
 test/images/mount-tester
 test/images/n-way-http
 test/images/port-forward-tester

hack/verify-flags/known-flags.txt

@@ -570,3 +570,5 @@ www-prefix
 zone-name
 garbage-collector-enabled
 viper-config
+log-lines-total
+run-duration

test/images/logs-generator/Dockerfile

@@ -0,0 +1,23 @@
+# Copyright 2016 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.
+
+FROM gcr.io/google_containers/ubuntu-slim:0.4
+
+MAINTAINER Mik Vyatskov <vmik@google.com>
+
+COPY logs-generator /
+
+CMD /logs-generator --logtostderr \
+  --log-lines-total=${LOGS_GENERATOR_LINES_TOTAL} \
+  --run-duration=${LOGS_GENERATOR_DURATION}

test/images/logs-generator/Makefile

@@ -0,0 +1,32 @@
+# Copyright 2016 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.
+
+TAG = v0.1.0
+PREFIX = gcr.io/google_containers
+
+all: build
+
+build: binary container
+
+binary:
+	go build -a --ldflags '-w' -o logs-generator .
+
+container:
+	docker build -t $(PREFIX)/logs-generator:$(TAG) .
+
+push:
+	gcloud docker push $(PREFIX)/logs-generator:$(TAG)
+
+clean:
+	rm -f logs-generator

test/images/logs-generator/README.md

@@ -0,0 +1,57 @@
+# Logs Generator
+
+## Overview
+
+Logs generator is a tool to create predictable load on the logs delivery system.
+Is generates random lines with predictable format and predictable average length.
+Each line can be later uniquely identified to ensure logs delivery.
+
+## Usage
+
+Tool is parametrized with the total number of number that should be generated and the duration of
+the generation process. For example, if you want to create a throughput of 100 lines per second
+for a minute, you set total number of lines to 6000 and duration to 1 minute.
+
+Parameters are passed through environment variables. There are no defaults, you should always 
+set up container parameters. Total number of line is parametrized through env variable
+`LOGS_GENERATOR_LINES_TOTAL` and duration in go format is parametrized through env variable
+`LOGS_GENERATOR_DURATION`.
+
+Inside the container all log lines are written to the stdout.
+
+Each line is on average 100 bytes long and follows this pattern:
+
+```
+2000-12-31T12:59:59Z <id> <method> /api/v1/namespaces/<namespace>/endpoints/<random_string> <random_number>
+```
+
+Where `<id>` refers to the number from 0 to `total_lines - 1`, which is unique for each
+line in a given run of the container.
+
+## Image
+
+Image is located in the public repository of Google Container Registry under the name
+
+```
+gcr.io/google_containers/logs-generator:v0.1.0
+```
+
+## Examples
+
+```
+docker run -i \
+  -e "LOGS_GENERATOR_LINES_TOTAL=10" \
+  -e "LOGS_GENERATOR_DURATION=1s" \
+  gcr.io/google_containers/logs-generator:v0.1.0
+```
+
+```
+kubectl run logs-generator \
+  --generator=run-pod/v1 \
+  --image=gcr.io/google_containers/logs-generator:v0.1.0 \
+  --restart=Never \
+  --env "LOGS_GENERATOR_LINES_TOTAL=1000" \
+  --env "LOGS_GENERATOR_DURATION=1m"
+```
+
+[![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/test/images/logs-generator/README.md?pixel)]()

test/images/logs-generator/logs_generator.go

@@ -0,0 +1,82 @@
+/*
+Copyright 2016 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.
+*/
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"time"
+
+	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/util/rand"
+)
+
+var (
+	httpMethods = []string{
+		"GET",
+		"POST",
+		"PUT",
+	}
+	namespaces = []string{
+		"kube-system",
+		"default",
+		"ns",
+	}
+)
+
+var (
+	linesTotal = flag.Int("log-lines-total", 0, "Total lines that should be generated by the end of the run")
+	duration   = flag.Duration("run-duration", 0, "Total duration of the run")
+)
+
+func main() {
+	flag.Parse()
+
+	if *linesTotal <= 0 {
+		glog.Fatalf("Invalid total number of lines: %d", *linesTotal)
+	}
+
+	if *duration <= 0 {
+		glog.Fatalf("Invalid duration: %v", *duration)
+	}
+
+	generateLogs(*linesTotal, *duration)
+}
+
+// Outputs linesTotal lines of logs to stdout uniformly for duration
+func generateLogs(linesTotal int, duration time.Duration) {
+	delay := duration / time.Duration(linesTotal)
+	rand.Seed(time.Now().UnixNano())
+
+	tick := time.Tick(delay)
+	for id := 0; id < linesTotal; id++ {
+		glog.Info(generateLogLine(id))
+		<-tick
+	}
+}
+
+// Generates apiserver-like line with average length of 100 symbols
+func generateLogLine(id int) string {
+	method := httpMethods[rand.Intn(len(httpMethods))]
+	namespace := namespaces[rand.Intn(len(namespaces))]
+
+	podName := rand.String(rand.IntnRange(3, 5))
+	url := fmt.Sprintf("/api/v1/namespaces/%s/pods/%s", namespace, podName)
+	status := rand.IntnRange(200, 600)
+
+	return fmt.Sprintf("%d %s %s %d", id, method, url, status)
+}