Category: Jmeter

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What is ELK

What is ELK (Elastic search, Logstash, Kibana) ?

ELK stack is a combination of 3 open-source products as below,

  1. Elasticsearch, a search and analytics engine.
  2. Logstash, that index the data to Elasticsearch. Logstash has a config file that has input,filter and output section. Config file looks like json file.
  3. Kibana, a visualization tool which provides a web based GUI for a user. User can design the bar, plot reporting charts.
    In order to make Kibana and Elasticsearch interact, you need to make both server up and running. Then logstash will index the data to Elasticsearch. 
    Then Kibana would read the data from Elasticsearch and visualize it.

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DevOps vs DevSecOps vs NetOps

What is DevOps vs DevSecOps vs NetOps ?

DevOps is the practice of using set of tools, processes and practices to get good agility in software implementation to customers. It combines Dev (software development ) and Ops (information operations). DevOps shortens the development lifecycles and provides Continous Integration & Delivery. 
DevSecOps is when security features are included in DevOps CI/CD flow.
NetOps is when network services are packaged to DevOps.

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Jenkins job vs pipeline

What is Jenkins jobs and Jenkins pipeline ?

Jenkins jobs and Jenkins pipeline are essentially same, however pipeline is more staged flow of jobs. For Jenkins pipeline, Jenkinsfile is used.
What is Jenkinsfile?Jenkinsfile is a text file placed in the root project directory. The Jenkinsfile has multiple stages like build, unit test, sonar test, functional,  regression, integration,  performance testing, deployment etc.

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Nested Java program loops

Nested Java program loops

import java.util.Scanner;

class NestedIfElse {
public static void main(String[] args) {
int marksObtained, passingMarks;
char grade;

passingMarks = 40;

Scanner input = new Scanner(System.in);

System.out.println(“Input marks scored by you”);

marksObtained = input.nextInt();

if (marksObtained >= passingMarks) {

if (marksObtained > 90)
grade = ‘A’;
else if (marksObtained > 75)
grade = ‘B’;
else if (marksObtained > 60)
grade = ‘C’;
else
grade = ‘D’;

System.out.println(“You passed the exam and your grade is ” + grade);
}
else {
grade = ‘F’;
System.out.println(“You failed and your grade is ” + grade);
}
}
}

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If else program in Java

If else program in Java

import java.util.Scanner;

class IfElse {
public static void main(String[] args) {
int marksObtained, passingMarks;

passingMarks = 40;

Scanner input = new Scanner(System.in);

System.out.println(“Input marks scored by you”);

marksObtained = input.nextInt();

if (marksObtained >= passingMarks) {
System.out.println(“You passed the exam.”);
}
else {
System.out.println(“Unfortunately you failed to pass the exam.”);
}
}
}

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Summary about Jmeter and performance testing

Summary about Jmeter and performance testing

Jmeter recording

How to create Jmeter scripts?

Recording Jmeter scripts using Jmeter’s HTTP(S) Test Script recorder. There are two ways

1)      Manually adding scripts ( Test plan >> Tread Group >> Add>> Sampler >> HTTP Request )

2)      Recording using Jmeter’s HTTP(S) Test Script recorder

How to record Jmeter scripts using HTTP(S) Test Script recorder

Prior doing that we need to configure browser and learn about the Proxy setup

Jmeter to Application server communication need to be routed through a browser Proxy for this recording purpose. For that you may need to select the Browser (here we can use Firefox browser”

1)      Navigate to Firefox >> Tools >> options >> Advanced >> Network >> Settings

2)      Select Manual Proxy configuration >> HTTP Proxy = localhost & Port = 8080

How to run Jmeter in Jenkins

steps:

Jenkins setup and performance plugin setup:
1) copy performance plugin into Jenkin’s home directry before you start the test.
2) to do that – you can download the performance plugin “performance.hpi” from the site https://wiki.jenkins-ci.org/display/JENKINS/Performance+Plugin
 3) how to find the home directry of jenkins – to do that you can navigate to jenkins home page (localhost:8080) and then
4) click on “Manage Jenkins” and then click on “Configure system” the you will notice “Home directy” path in there.

Configure Jmeter and create a basic script in Jmeter:
5) download Jmeter Binary zip file from Jmeter site http://jmeter.apache.org/download_jmeter.cgi
 6) unzip it and go to the “bin” directory of the Jmeter folder, wherre you will notice “user.properties” file.
7) open the file in notepad or notepad++ or any other text editor
8) add a line “jmeter.save.saveservice.output_format=xml” to that. Save and close the “user.properties” file
9) create a Jmeter script and make sure you can run it in non GUI mode i.e either in DOS mode or using shell scripts in MAC (note down the commands used in respective OS and it could be used in Jenkins job setup)
Note: for windows command line run, you can use the following commands

C:\[JMETER BIN directory]\jmeter.bat -Jjmeter.save.saveservice.output_format=xml -n -t C:\[JMETER script “.jmx” file] -l Jmeter_test_results.jtl

Note 1: For detailed topics on Jmeter scripts creation , please visit Jmeter , Jmeter recording 

setup Jenkin’s job to run Jmeter scripts
9) go to Jenkins home page (localhost:8080) and then click on “New Item” on “Freestyle project”
10) in the “New item” page, give some name in the item name field and go to below to section “Build” and add build step
11) add build step can be either a) “execute windows batch command” for windows or b) “Execute shell” for MAC
12) provide your command in there and save.
13) Click on “Build now” which would call the Jmeter (jmx) file and run the program
14) after the run, you can verify the Jenkins console to review the results.

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Jmeter tutorial on Jmeter components, terminologies etc

Jmeter tutorial on Jmeter components, terminologies etc…

1.       Thread group – refers the virtual users count applied while performance testing using Jmeter.

How we design the user transactions or thread group?

1)      The requirement is given that 60 user transactions needs to be made. And requested for 3 sec interval between transactions

2)      Then Ram up time should be set 180 sec.  This will fulfill the requirement of 3 sec delay between transactions

3)      This will also ensure that the 60th thread or user will be starting the action at 180th sec.  ( i.e Ramp up time / number of users – will give you the time interval for each uses to kick off. Total ramp up time will be the total time to start all transactions including the 60th one. Based on the transaction scenario length probably first set of 1 to 50th ones may be finished by this time) – similar articles on Jmeter , script Recording

2.       Samplers

Samplers are transaction makers which will let you send transactions.

For e.g HTTP Request sampler is used, it will send HTTP/HTTPS request to the web server. This requests can be manually added or recorded using HTTP(S) Test Script Recorder.

Web embedded resources like CSS, images, java applets, scripts, background images are retrieved by HTTP requests.

similar article on Jmeter

3.  Test plan

Test plan is the container of all the performance test scenarios and components of the particular test in Jmeter. Test plan consists of Thread group , temporary work bench, Samplers, etc.