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- What is Zalenium? Docker based Selenium Grid
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Selenium EasyPosted by: jeato in Uncategorized 2 Comments. To help us accomplish this goal in a timely fashion, we employ a fleet of automated tests, running concurrently on a Selenium Grid. Selenium Grid is a great way to speed up your tests by running them in parallel on multiple machines. However, rolling your own grid also means maintaining it. Not to mention troubleshooting when something goes wrong on an individual node. God help you when it comes time to perform any updates. Sure, you could always go with third-party solutions like SauceLabs or BrowserStackbut these can be expensive to justify. It would also be great if we had a way to quickly recover in case an individual node crashes or otherwise ends up in a bad state. For the uninitiated, Docker is a lightweight container read: a scaled-down VM that provides a fast and programmatic way to run distributed applications. Selenium Grid is distributed system of nodes for running tests. Instead of running your grid across multiple machines or VMs, you can run them all on a single large machine using Docker. The two are practically destined for each other. Enter Docker Compose formerly known as Fig. This is what lets us take our Docker images and spin them up as a pre-configured Selenium Grid cluster. A huge benefit of using Docker is its capacity to scale. Running Selenium Grid on separate machines or even a set of VMs requires a lot of unnecessary computing overhead. Docker images run as userspace processes on a shared OS; so your images share some system resources, but are still isolated and require far fewer resources to run than a VM. This means you can cram more nodes into a single instance. Docker and Compose also take care of the networking for you! So if one of your nodes ends up in a bad state, rather than figuring out which node is wedged and digging through its logs looking for a clue you can just restart the entire grid. Luckily, both projects have great documentation on this topic:. The Grid is basically a single hub connected to any number of different nodes. So, our hub image should look something like this:. Finally, we need a single Dockerfile for all of our nodes. In this example, every node will be a copy of this Dockerfile. Because Selenium is often incompatible with the last 1 or 2 versions of Firefox. See the Selenium change log or their support policy for the most recently supported Firefox versions. For this reason, specifying a specific version of Firefox in our Dockerfile is a good rule of thumb:.
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GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Selenium 3 docker run The purpose of this project is to have Selenium running as simple and as fast as possible. This purpose is augmented by Zalenium a project which uses this one to provide docker-selenium s on-demand. Even though both projects share the same purpose is good to have alternatives, see also for example docker-alpine-selenium. Letting more than 1 docker-selenium project grow to be able to learn from each other's success or failures ultimately impacts the final users positively. This doesn't discard that at some point all selenium maintainers will sit together a sprint to coordinate some major changes and cleanup open issues and perhaps we might merge N similar projects in the future. If you don't require video recording we suggest to use either Google Chrome in headless mode or Firefox in headless mode. You can also use a paid service like Sauce Labs or BrowserStacknote they offer free open source accounts and straightforward integration with Travis CI. This project is normally tested in the last version of Docker and docker-compose and also in the release candidates. To figure out the currently used specific versions it surely works on, see file. If you need to use docker-machine to run docker like for example on a Mac before the Docker native version 1. Wait until the grid starts properly before starting the tests Optional but recommended. We now have a better suited product for this use case, is called Zalenium. This image is designed to run one test on each docker container but if you still want to run multiple tests in parallel you can still do so with Zalenium. The recommended way is via docker-compose and you should replace mock with your web service under test within the [docker-compose-tests. The drawback is that all tests will run on the same desktop meaning the video recording will only capture the browser in the foreground but it's in the roadmap to make all this transparent, see issues 78 and If you are in Mac, you need to get the correct IP of the docker machine. One of these two commands should work to get it:. You can control and modify the timezone on a container by using the TZ environment variable through the docker run command, e. This feature was available in previous versions, please go to 2. Default is stable. Default is the latest number of the available list. Or simply stop the container and that will stop the video recording automatically. Relevant up-to-date environment variables to customize it are at the Dockerfile, below a possibly outdated list of settings:. It is important to note that ffmpeg video recording takes an important amount of CPU usage, even more when a well compressed format like mp4 is selected.
As discussed in one of our previous tutorial Selenium grid helps to run our test cases in different operating systems and on different browsers. However, this Docker Selenium Tutorial will explain to you more about what a Docker is and how we download, install, and integrate it with Selenium grid along with concerned screenshots and this pictorial representation will enable you to understand the process quickly and easily too. Selenium grid helps to master computer hub to distributed test cases among the slave machines nodes. When we implement all the test cases in one machine at some point there might be some limitations, and sometimes one single machine will not be sufficient enough to run all the test cases and that point of time Selenium grid comes into the role. At that time some other countries who developed web systems for China had to test their web system with different browsers expect Google products google chrome such as internet explorer, Firefox, Opera etc. And at that point of time selenium grid was very useful to the companies who developed web systems for China, as they used selenium grid for running their test cases in different browsers expect Google chrome. In simple terms, Docker can be termed as a container. Developers or Docker users can put things like database, libraries, dependencies into that container and then use that database, dependencies, and libraries to create, deploy and run applications. By using Docker containers you can setup and package up a software application with all of the contents that are required to build that application, such as databases, libraries, and other dependencies, and finally, you can ship them all out as one package. Usually while configuring the Selenium grid we need to host multiple virtual machines as nodes and we need to connect each and every single node with the hub. Also, when we setup a normal grid we need to download selenium server jar file and run that jar file on each and every computer in which we are going to setup the selenium grid. This is costly and sometimes a time-consuming task for the testers. However, Docker helps us to solve cost involving and time-consuming problems. Docker was invented by Solomon Hykey and was launched into the software industry in March as an open-source tool. Nowadays, developers and system engineers are using Docker for several reasons. Next thing that we need to do is to install the Docker toolbox. In order to run Docker commands, we need Docker quick start terminal which will come along with the Docker toolbox. Hence we have to install Docker toolbox. We can download Docker toolbox from any website but, I would highly recommend you to download Docker toolbox from their official website: Docker. While installing Docker toolbox, few checkbox will appear and in order to succeed your installation, you need to check all those checkboxes and install Docker toolbox. If you have installed it successfully, then you will get the following three Docker toolbox icons. After installing the Docker toolbox double-click and open the Docker quick start terminal. Docker will configure your default machine with the IP Address: Hence you have to wait until the following window appears. Basically, while we configure the selenium grid without Dockerwe also need to configure selenium hub and nodes browsers. Like normal grid when we configure selenium grid with the Docker we have to install the hub and browser nodes into our Docker container and later, we can start the hub and nodes from that Docker container. The next question will be, how to find those images. In order to find those images we move on to the Docker Hub and search those images by name and you can also type the image name in the search bar as shown below. This window shows all the image repositories that we have for selenium hub. Here you need to click the image that has the most number of pulls and it will help to run our code without any errors. Once you click on that image you will see another window like the one given below. Note: Click on any image for an enlarged view. This window will provide you with all the information about the image selenium hub image and will give you all the commands relevant to that image selenium hub image. Here, the Docker pull command is the command to install that Docker image to your container.
What is Zalenium? Docker based Selenium Grid
For information about features available in Edge releases, see the Edge release notes. Docker is a full development platform to build, run, and share containerized applications. Docker Desktop is the best way to get started with Docker on Windows. See Install Docker Desktop for download information, system requirements, and installation instructions. Run docker --version to ensure that you have a supported version of Docker:. Pull the hello-world image from Docker Hub and run a container:. List the hello-world image that was downloaded from Docker Hub:. In this section, we demonstrate the ease and power of Dockerized applications by running something more complex, such as an OS and a webserver. Pull an image of the Ubuntu OS and run an interactive terminal inside the spawned container:. You are in the container. At the root prompt, check the hostname of the container:. Exit the shell with the exit command which also stops the container :. List containers with the --all option because no containers are running. Pull and run a Dockerized nginx web server that we name, webserver :. Stop the running nginx container by the name we assigned it, webserver :. The Docker Desktop menu allows you to configure your Docker settings such as installation, updates, version channels, Docker Hub login, and more. This section explains the configuration options accessible from the Settings dialog. On the General tab of the Settings dialog, you can configure when to start and update Docker. Automatically check for updates - By default, Docker Desktop automatically checks for updates and notifies you when an update is available. Click OK to accept and install updates or cancel to keep the current version. You can manually update by choosing Check for Updates from the main Docker menu. You must use this option with caution as exposing the daemon without TLS can result in remote code execution attacks. Send usage statistics - By default, Docker Desktop sends diagnostics, crash reports, and usage data. This information helps Docker improve and troubleshoot the application.