{"id":5017,"date":"2018-07-23T11:28:04","date_gmt":"2018-07-23T15:28:04","guid":{"rendered":"https:\/\/www.redline13.com\/blog\/?p=5017"},"modified":"2018-07-23T11:28:04","modified_gmt":"2018-07-23T15:28:04","slug":"jmeter-pro-tip","status":"publish","type":"post","link":"https:\/\/www.redline13.com\/blog\/2018\/07\/jmeter-pro-tip\/","title":{"rendered":"JMeter Pro Tip – Extracting AWS Meta Data For your JMeter Test"},"content":{"rendered":"

In this example we will show how to extract AWS instances parameters using JSR223 Sampler on JMeter.\u00a0In addition, you will learn how to run bash command scripts on remote linux servers using JMeter.\u00a0This is a JMeter Pro Tip that can save you time. \u00a0<\/span><\/p>\n

In some cases it is necessary for the load test to send a linux command to\u00a0 the remote linux server. For example, after completing a load test and before retesting again you might need to connect to the servers to delete some folder or content. To do this you need to use putty program to connect via ssh protocol. For instance, one load test may download large images. Before beginning the next test you may need to delete the data. If using many servers this might require extra effort. Using this method you can access the servers and easily delete or modify the data.<\/p>\n

Let’s get started.<\/p>\n

JMeter Pro Tip: Step by Step<\/h3>\n

Firstly we will add a Thread Group to our Test Plan.<\/p>\n

<\/p>\n

Second step is to add the JSR223 Sampler to our Thread Group and add the script to execute a Linux command on an EC2 instance to get the instance type.<\/p>\n

<\/p>\n

Now we are ready to configure our JSR223Sampler. To execute any query on AWS instances \u201cexecute()\u201d<\/strong> method is using on JSR223Sampler. To get the output message after execution we declared a parameter named \u201cstring<\/strong>\u201d.<\/p>\n

def string=\"\/bin\/bash -c EC2metadata --instance-type\".execute().text\n\nvars.put(\"output\", newTest)<\/pre>\n
<\/strong><\/p>\n
When executing the script, the important point is that we need to save the AWS instance name as a variable. Our variable name is \u201coutput<\/strong>\u201d.<\/p>\n
Now we add a BeanShell Sampler on our Thread Group. The crucial part of this section is to give the sampler a distinguishing name. Our distinguishing name is the AWS instance name which we extracted from our previous sampler \u201coutput<\/strong>\u201d. So we are naming this sampler as BeanShell ${output}. ${output} refers to AWS EC2 instance type name such as a t2.smalllocal.<\/p>\n
<\/strong><\/p>\n
After completing the script, we run the script through RedLine13. The result are:<\/p>\n
<\/p>\n
To extract just the instance type we need to split the whole info using \u201c-\u201d character. To perform this we just add 2 lines of code and modify the \u201coutput\u201d value with the new one.<\/p>\n
String[] test = string.split(\"-\");\n\nString newTest = test[17];\n\nvars.put(\"output\", newTest)<\/pre>\n
<\/strong><\/p>\n
When making a remote connection through ssh protocol on an AWS instance and running this command\u00a0\u00a0<\/span>ec2metadata \u00a0–instance-type \u00a0<\/b>it gives only the instance name as a result. However, when you try this command (<\/span>ec2metadata \u00a0–instance-type<\/b>) on JMeter it instead gives you the\u00a0full result as \u201cec2metadata\u201d (see picture above). \u00a0This does not cause a problem. Adding the 2 lines of code above we can extract the variable to whatever we want. <\/span><\/p>\n
JMeter Pro Tip – Running Your Script<\/h3>\n
After completing the script we are now ready to run the script on RedLine13<\/a>. Adding an EC2 server is extremely easy and flexible. Click Servers->Server Mgnmt->Add Server and then choose the instance.<\/p>\n
<\/p>\n
After launching the server, let\u2019s run our script on RedLine13<\/a>.<\/p>\n
After completing the test, the results are shown below.<\/p>\n
<\/strong><\/p>\n
What is your JMeter Pro Tip?<\/p>\n","protected":false},"excerpt":{"rendered":"
In this example we will show how to extract AWS instances parameters using JSR223 Sampler on JMeter.\u00a0In addition, you will learn how to run bash command scripts on remote linux servers using JMeter.\u00a0This is a JMeter Pro Tip that can save you time. \u00a0 In some cases it is necessary for the load test to send a linux command to\u00a0 the remote linux server. For example, after completing a load test and before retesting again youRead More →<\/a><\/p>\n","protected":false},"author":1,"featured_media":5026,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,2,7,43],"tags":[],"class_list":{"0":"entry","1":"post","2":"publish","3":"author-user","4":"post-5017","6":"format-standard","7":"has-post-thumbnail","8":"category-aws","9":"category-blog","10":"category-jmeter","11":"category-pro-tip"},"yoast_head":"\nJMeter Pro Tip Extracting AWS Meta Data<\/title>\n<meta name=\"description\" content=\"JMeter Pro Tip for extracting AWS Meta Data into your JMeter Script\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.redline13.com\/blog\/2018\/07\/jmeter-pro-tip\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" 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