Does anyone have a shell script or know of a way to ping a selenium hub to see if Nodes are available. Like a way to use wait-for or wait-for-it or another way to check the Selenium Hub for a node before triggering a test?
EDIT: A specific node with a browser version available. So for example if the hub has Chrome 64 attached and Chrome 63 is connecting I'm trying to ping the hub until the Chrome 63 node attaches to the hub and is available for use.
There is an endpoint in the Selenium Hub that can give you some of this info.
way to check the Selenium Hub for a node before triggering a test
Do a GET to http://your-hub-here:4444/grid/api/hub and you should see the free/total slotCounts (look at newSessionRequestCount to see queued tests). It doesn't have the granularity to show different browsers but you can get overview to determine if your grid is saturated.
Or if you are using Selenium Grid Extras there would probably be an API behind their webview, that you would call to get the number of available browsers.
Try this if you run docker on your local machine http://localhost:4444/wd/hub/status
Here is a general from http://{location}:4444/wd/hub/status
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On my local machine, I arrived to test my applications with Selenium with any problems.
But, when I'm doing the same operations on a server Centos7 (I have no graphical interface), I've many errors such as web element not found.
I'm using Docker containers for selenium (hub and nodes). The installation is OK and I can see my drivers on Http://:4444/grid/console.
Does Selenium require a graphical interface for its work?
Yes. Selenium requires the browser GUI to be present - which is also called viewport.
If you want that Selenium execution happen, without the browser GUI to be present, then you need to use a headless browser, which , as the name suggests is headless, which means there would be no GUI for them.
Examples of these headless browser include PhantomJS- link. Now Chrome also has a headless mode - link, which you can specify using ChromeOptions. Cheers!
I have a Java Application, which controls an automated GUI test in a FF-Browser via Selenium WebDriver Libraray. The Java App reads test cases from a database and executes them according to the code logic.
For instance, if the app reads in a Field, it'll search it by using the "findElement"-method from the Selenium framework. I do not use any test scripts for Selenium.
Currently this is happening on a local workingstation of an employee.
Now I want to move this whole environment into a Docker container.
Is it even possible to instantiate a Firefox Browser in a Container?
btw: I do not need to see the actual GUI of my browser.
And secondly:
There are several containers with selenium on dockerhub ready to use, but these do not fit my surroundings am I right?
As far as I know the SeleniumGrid expects testscripts and cannot be executed through runtime.
I open up a Linux VM (Debian:Jessie distribution) with Vagrant, in which then runs Docker.
I am still a beginner with Docker.
I couldn't find any question around here regarding my purpose.
Thanks in advance!
Is it even possible to instantiate a Firefox Browser in a Container?
Yes. The simplest way to do this is would be using the selenium images on Docker Hub.
There are several containers with selenium on dockerhub ready to use, but these do not fit my surroundings am I right?
If you think the Selenium images don't work for you because they are all based on Selenium Grid, you can use the StandaloneFirefox and StandaloneChrome images instead. These are individual instances, they do not use Selenium Grid.
BTW, the non-Debug Selenium images do not have a GUI. You mentioned you didn't need to see the browsers running so these should be fine. If you do need to see the browsers, the Debug images have a VNC server installed so you can run the image, connect with a VNC client, and watch the browsers run the tests.
I was asked a question :
Assume I have 4 machines and I need to execute a script in all the machines across all the browsers. How will I achieve that.
I told him the concept of Selenium Grid, where in we could set up a machine which acts like a hub, configure 3 more machines which would act like a node.
Using Desired Capabilities among others we could choose a browser type and version type in that and write a script.
But he asked me two things :
IN all the node machines how do you configure the Windows username and Password if the machine is locked. Can you write windows Authentication in the script.
Can I achieve testing different browser versions of same browser type in a single node?
Can I pass as a the browser type and browser version as a parameter
from hub to the node?
Can someone throw some light on these as I was unable to answer. Thanks.
Question 1: Is it really necessary for the machine to be unlocked for the test to start? The selenium node is a background process that listens for commands, and executes them on the browser, so I do not think this is necessary. If it is necessary due to your specific windows settings however, then no, you cannot do this from the selenium script obviously.
Question 2: Yes, you can test different browser versions of the same type on the same node. You can pass the browser name and version to the node. However, keep in mind that the node cannot know the location of the different browser versions, so you will also have to supply the path to the browser executable for your requested version
I have a docker container running a rails app (let's call it container A) that needs to do some scraping with watir webdriver using firefox as backend.
I have firefox installed in another container (container B) and I want to be able to pass in container A something like:
Selenium::WebDriver::Firefox::Binary.path= $DOCKER_RUN_CONTAINER_A
So, each time watir launches firefox a new instance of CONTAINER_A launches a new firefox.
I know it's easy to make containers communicate using ports, but how about executables?
And, by the way, does it look like a good design idea isolating firefox in a separate container?
Yes, this is easy to do. Just run an instance of Selenium Grid (which is a grid-node hybrid combo by default) , in the foreground on the docker server (on port 5555 or whatever). Then you can use Ruby with Selenium bindings (not WatiR) to drive the firefox browser on the remote box.
My current setup is 5 nodes with 10 Firefox browsers each, all connected to a hub.
I am running into a problem where I am exhausting the 10 firefox browsers for each node. So any new selenium runs are getting queued up at the Hub and running when any FF browser for a node becomes available.
What I want to do is somehow query the selenium grid2 hub to get the number of free/idle/available browsers before actually running my tests on that particular grid setup. Based on my result I would redirect the tests to another grid setup (on another machine) or may be not even run the tests.
Of course I can add more nodes or even increase the number of browsers that can be handled by each node. But I am looking for an answer which will help me query the Grid and then allow me to decide on what action I can take rather than muscling my way by brute force (bigger server to handle more browser sessions).
I also sense that this may be a feature not implemented by Selenium Grid 2, so was wondering how others have got around this problem.
It provides sessions information from each selenium node in a selenium grid. You can get the session information of each node like this (assume your selenium node listens to port 5555):
$ curl http://<selenium-node>:5555/wd/hub/sessions
You will get a JSON object response like this:
{"value":[],"sessionId":null,"status":0,"hCode":1542413295,"class":"org.openqa.selenium.remote.Response"}
Then you can calculate how many active sessions from the "value" array value on each selenium node when it hits those nodes. Then you know how many left.