The robot tests can analyse the connection between 2 VNFs, but they can do a lot of different things. For example, it can test the connection between 2 VMs.<\/p>\n\n\n\n
The tests performed for 2 VNFs can be:<\/p>\n\n\n\n
- \n
- BandWidth<\/li>\n\n\n\n
- Open Ports<\/li>\n\n\n\n
- Packet Loss<\/li>\n\n\n\n
- Transmission Speed<\/li>\n\n\n\n
- Jitter<\/li>\n\n\n\n
- etc<\/li>\n<\/ul>\n\n\n\n
Installation<\/h3>\n\n\n\n
Firs of all, you need to install the robot framework in your machine:<\/p>\n\n\n\n
![\"\"](\"https:\/\/community.5gasp.eu\/wp-content\/uploads\/2023\/03\/image-37.png\")
<\/figure>\n\n\n\n<\/p>\n\n\n\n
In this case, we will be testing the Jitter<\/strong>. Before that, create the needed files:<\/p>\n\n\n\n
![\"\"](\"https:\/\/community.5gasp.eu\/wp-content\/uploads\/2023\/03\/image-38.png\")
<\/figure>\n\n\n\n<\/p>\n\n\n\n
After that, you can check the structure of your file using the tree command:<\/p>\n\n\n\n
![\"\"](\"https:\/\/community.5gasp.eu\/wp-content\/uploads\/2023\/03\/image-40.png\")
<\/figure>\n\n\n\nCode<\/h3>\n\n\n\n
To avoid changing the variables in the script, we will use environment variables:<\/p>\n\n\n\n
![\"\"](\"https:\/\/community.5gasp.eu\/wp-content\/uploads\/2023\/03\/image-41.png\")
<\/figure>\n\n\n\n<\/p>\n\n\n\n
As you can see, we defined the IP<\/strong> and credentials<\/strong> for both VNFs.<\/p>\n\n\n\n
The username<\/strong> and password<\/strong> also need to be defined because we will be executing commands through SSH.<\/p>\n\n\n\n
Finally, the last 2 commands define the comparator<\/strong> and the threshold<\/strong> for the Jitter.<\/p>\n\n\n\n
jitter\/jitter.py<\/h4>\n\n\n\n
Now, we can start to edit the python script:<\/p>\n\n\n\n
![\"\"](\"https:\/\/community.5gasp.eu\/wp-content\/uploads\/2023\/03\/image-42.png\")
<\/figure>\n\n\n\n<\/p>\n\n\n\n
As you can see, we are using the environment variables to define the IPs and credentials of the machines.<\/p>\n\n\n\n
After that, we are checking if the needed packages are installed and, if not, install them. This can also be done manually.<\/p>\n\n\n\n
The
paramiko<\/code><\/strong> package is used to run commands through SSH in each VNF.<\/p>\n\n\n\nAfter that initial code, we can make the test function:<\/p>\n\n\n\n
![\"\"](\"https:\/\/community.5gasp.eu\/wp-content\/uploads\/2023\/03\/image-43.png\")
<\/figure>\n\n\n\n<\/p>\n\n\n\n
In the first part, we are connecting to each VNF using an SSH client from the
paramiko<\/code><\/strong> package.<\/p>\n\n\n\nHaving the connection to the VNFs, in the second part, we are executing the commands to obtain the Jitter<\/strong>, using
iperf3<\/code><\/strong>, and then returning it.<\/p>\n\n\n\njitter\/testJitter.robot<\/h4>\n\n\n\n
Now, we will edit our robot file:<\/p>\n\n\n\n
![\"\"](\"https:\/\/community.5gasp.eu\/wp-content\/uploads\/2023\/03\/image-44.png\")
<\/figure>\n\n\n\n<\/p>\n\n\n\n
In
*** Settings ***<\/code><\/strong>, we are defining the python script to be used (jitter.py), which we just created in the previous section.<\/p>\n\n\n\nInside
*** Test Cases ***<\/code><\/strong> we can define the test itself.<\/p>\n\n\n\nFirstly, we are assigning the environment variable
jitter_comparator<\/code><\/strong> to the comparator itself. In our case, since our EV had the valueless_or_equal_than<\/code><\/strong>, the comparator will have the value<=<\/code><\/strong>.<\/p>\n\n\n\nThen, using the returned jitter value from the python script, the robot test will compare it to our threshold, defined in our EV
jitter_threshold<\/code><\/strong> (0.03<\/strong>).<\/p>\n\n\n\nIperf3<\/h4>\n\n\n\n
Before running the test, we need to make sure that the
iperf3<\/code><\/strong> package is installed in the VNFs, so the jitter can be obtained.<\/p>\n\n\n\nFor that, you have 2 options:<\/p>\n\n\n\n
- \n
- Install through SSH command in each VNF:
sudo apt-get install iperf3<\/code><\/strong><\/li>\n\n\n\n- Through the VNF cloud-init files<\/li>\n<\/ul>\n\n\n\n
Run the test<\/h3>\n\n\n\n
Make sure you exported the environment variables.<\/p>\n\n\n\n
With that in mind, we can now run our test:<\/p>\n\n\n\n
![\"\"](\"https:\/\/community.5gasp.eu\/wp-content\/uploads\/2023\/03\/image-45.png\")
<\/figure>\n\n\n\n<\/p>\n\n\n\n
If everything goes accordingly, you should obtain this output:<\/p>\n\n\n\n
![\"\"](\"https:\/\/community.5gasp.eu\/wp-content\/uploads\/2023\/03\/image-46.png\")
<\/figure>\n\n\n\n<\/p>\n\n\n\n
As you can see, the test was successful.<\/p>\n\n\n\n
Logs<\/h3>\n\n\n\n
The robot framework automatically generates a log.html file that contains the test details:<\/p>\n\n\n\n
![\"\"](\"https:\/\/community.5gasp.eu\/wp-content\/uploads\/2023\/03\/image-47.png\")
<\/figure>\n\n\n\n<\/p>\n\n\n\n
As it is visible, you get a very detailed description on what happened, like the values obtained and each step of the test.<\/p>\n\n\n\n
Materials<\/h2>\n\n\n\n
For a better description of the tutorial, you can check our video\u00a0here<\/a>.<\/p>\n\n\n\n
- Through the VNF cloud-init files<\/li>\n<\/ul>\n\n\n\n
- Install through SSH command in each VNF: