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.
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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'm using Xvfb + Selenium standalone server to do some webpage testing. I have multiple remote web drivers(threads) to send request to selenium server, but looks like if multiple testings run in parallel, the performance is much slower than that of running tests one by one.
Does Xvfb has restriction on the number of windows that can be opened, say firefox windows/instances?
If two firefox windows are running inside Xvfb, can these two windows be manipulated at same time, say clicking a link on the page? As we know, on a desktop display, only the most top window can be manipulated, like clicking and entering something on the page.
Do I need to setup a Xvfb process for each selenium test to get better performance?
Thanks!
I would like to make it clear about the difference between protractor VS ghostdriver.
With protractor:
start selenium web server for testing.
multiple browser testing.
whenever it start testing, it open the browser.
With ghostdriver:
start phantomjs web server.
can be config multiple browser too.
can run separate with selenium or integrate with selenium.
My question is PhantomJS webdriver can run alone without selenium webdriver, multiple browsers and good for CI. Why do we need to run selenium and integrate selenium with phantomjs using ghostdriver?
While I'm not entirely sure I understand your question, I'll take a stab at answering it. With WebDriver, driving a browser is done via a standardized JSON-over-HTTP wire protocol. This means that you need a "server" component that understands the wire protocol to drive any particular browser. For each of the major desktop browsers (Internet Explorer, Chrome, and Firefox), there is a server component that your WebDriver code talks to (IEDriverServer.exe, chromedriver.exe, or a Firefox browser extension, respectively). PhantomJS also implements a server component that understands the WebDriver wire protocol, so the same high-level WebDriver code can be used with PhantomJS that is used with other browsers. Note that the Selenium server is not required to drive any of the browsers on the local machine.
Now, since the protocol used is simply transmitted over HTTP, that gives WebDriver the opportunity to run the WebDriver code on one machine, while driving a browser located on an entirely different machine. That's where the Selenium server comes in. The Selenium server starts an HTTP server that understands the WebDriver JSON wire protocol. When that server receives a WebDriver command, it can forward that command to another "server" component, either running on that machine (as a standalone remote server), or on yet another machine running another instance of the Selenium server (in a "grid" configuration).
So to answer your question, yes, WebDriver code can be executed against PhantomJS without using the Selenium server. It can likewise be executed against Internet Explorer, Firefox, Chrome, Safari, and some versions of Opera, all without using the Selenium server. Notice that all of this is true without mentioning Protractor at all. Since Protractor is based on WebDriverJS, as long as there's a "server" component running, whether that's a Selenium server, chromedriver.exe, IEDriverServer.exe, or PhantomJS, the driver should be able to communicate with and drive that browser. Looking at the code, it appears that WebDriverJS (and, by extension, Protractor), should be able to execute against Chrome and PhantomJS without requiring the Selenium server, but I don't know enough about Protractor's wrapping of WebDriverJS to speak with authority.
We have Xserver-less CentOS system for continuous integration. So no UI.
I want to run selenium test cases on it. I am using new Alpha version of Selenium2 which has WebDriver integration. It starts and ends browser by its own. Now, How do I start that in background? Something similar is possible with Internet Explorer?
I am able to run correctly on local machine. But it opens Firefox UI.
Are you able to run a virtual frame buffer? That way, all the GUI programs can believe there's graphics happening, even if there's no actual screen. You may wish to search for the term "headless". One example.
Another possibility may be to use Celerity - a ruby-based "headless browser". It uses the Watir interface (originally a competitor to selenium), which I understand to be merging with webdriver.