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webApp

webApp is container image to simulating CPU/Memory intensive or high latency workload.

Introduction

This web app is built with apache httpd and php. It can simulate CPU intensive, Memory intensive, or High latency workload. It can accept Get or Post requests to simulate different level of workloads.

It also enables the mod_status of the httpd server, so that user can have a easier way to understand the workloads.

Build docker image

Build a docker image. (beekman9527/webapp is the image in dockerhub)

$ export imageName="webapp"
$ docker build -t $imageName .

Run container

First, run the container from the image.

# 28080 is host port.
$ docker run -d -p 28080:8080 $imageName

Second, access the web Page via:

http://hostIP:28080/index.html
or
http://localhost:28080/index.html

Test workload

All the pages can be accessed via HTTP GET or POST, and the parameters are the same.

Latency simulation

It has one parameter value, the duration to delay(or sleep in server side), in milliseconds.

For example, delay 30 ms. Access it via web browser

http://localhost:28080/workload.php/?value=30

Access it via curl Post

curl -H 'Content-Type: application/x-www-form-urlencoded' -X POST -d 'value=30' http://localhost:28080/workload.php

Memory intensive simulation

It has two parameters, memory is amount of memory (in MB) to consume; the other is value, the duration to hold the memory, in milliseconds.

For example, consume 10 MB memory, and hold the memory for 110 ms. Access it via web browser

http://localhost:28080/memwork.php/?value=110&memory=10

Access it via curl Post

curl -H 'Content-Type: application/x-www-form-urlencoded' -X POST -d 'value=110&memory=10' http://localhost:28080/memwork.php

CPU intensive simulation

It will use as much CPU as possible to compute the MD5 for huge amout of integers. It has one parameter, cpu, indicating the amount of computation.

Access it via web browser

http://localhost:28080/cpuwork.php/?cpu=30

Access it via curl Post

curl -H 'Content-Type: application/x-www-form-urlencoded' -X POST -d 'cpu=30' http://localhost:28080/cpuwork.php

Stable workload generator

webclient can be used to generate stable workload for this webApp. This webclient can also deployed in the same Kubernetes cluster to send requests to this webApp.

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: httpclient
  namespace: default
  labels:
    purpose: generate-http-load
spec:
  replicas: 2
  selector:
    matchLabels:
      app: httpclient
  template:
    metadata:
      labels:
        app: httpclient
    spec:
      serviceAccount: default
      containers:
      - name: httpclient
        image: beekman9527/webclient:v1
        imagePullPolicy: IfNotPresent
        args:
        - --v=3
        - --threadNum=6
        - --logtostderr
        - --target=http://music.default:8080/cpuwork.php/?cpu=20
        - --rps=2