Selenium Grid + Docker + AWS EC2

This is going to be a simple (and single) entry point for setting up and running Selenium Grid inside of Docker containers on AWS EC2.

So steps will be the next:

1. Create and start EC2 instance

2. Open port 4444 as it’s used by the grid through the adding needed security rule:

    I. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/

    II. In the navigation pane, choose the Security Groups link. 

    III. Select the Inbound tab, choose Edit.

    IV. In the dialog, choose Add Rule and do the following:

        - Type: Custom TCP
        - Protocol: TCP
        - Part Range: 4444
        - Source: My IP
        - Description: Selenium Grid (or any other one)

Once the Selenium Grid is up and running, if 52.222.124.100 (for example) is the public facing IP address  connecting to http://52.222.124.100:4444/grid/console will connect to the console.

Login into and install Docker:

Install Docker on the AWS instance: 

$ sudo yum install -y docker

Start the docker service: 

$ sudo service docker start

Add the ec-2-user to the Docker group: 

$ sudo usermod -a -G docker ec2-user

Close the Mac Terminal and reopen it to reset permissions.

Setting up grid (images from https://hub.docker.com/u/selenium/ & instructions from https://github.com/SeleniumHQ/docker-selenium)

$ docker network create grid

$ docker run -d -p 4444:4444 --net grid --name selenium-hub selenium/hub:3.11.0-bismuth

$ docker run -d --net grid -e HUB_HOST=selenium-hub -v /dev/shm:/dev/shm selenium/node-chrome:3.11.0-bismuth

$ docker run -d --net grid -e HUB_HOST=selenium-hub -v /dev/shm:/dev/shm selenium/node-firefox:3.11.0-bismuth

With docker-compose file it will be easier.

Install docker-compose:

$ sudo curl -L https://github.com/docker/compose/releases/download/1.20.1/docker-compose-'uname -s'-'uname -m' -o /usr/local/bin/docker-compose

$ sudo chmod +x /usr/local/bin/docker-compose

In home directory (directory from where You’re starting grid):

$ touch docker-compose.yaml

Paste next content (example from SeleniumHQ)

---------------------------------------------------------------------------

# To execute this docker-compose yml file use docker-compose -f <file_name> up  

 # Add the "-d" flag at the end for deattached execution  

 version: '2'  

 services:  

  firefox:  

   image: selenium/node-firefox:3.11.0-bismuth  

   volumes:  

    - /dev/shm:/dev/shm  

   depends_on:  

    - hub  

   environment:  

    HUB_HOST: hub  

   

  chrome:  

   image: selenium/node-chrome:3.11.0-bismuth  

   volumes:  

    - /dev/shm:/dev/shm  

   depends_on:  

    - hub  

   environment:  

    HUB_HOST: hub  

   

  hub:  

   image: selenium/hub:3.11.0-bismuth  

   ports:  

    - "4444:4444"  

---------------------------------------------------------------------------

$ docker-compose up -d - to start grid

$ docker-compose down - to stop grid

If needed more than 1 node either for Chrome or Firefox just add the entry into docker-compose file.

Example of usage will be something like that from Your selenium setup (for Jenkins it can be done separately):

@BeforeMethod(alwaysRun = true)

public void setupBaseTest() throws Exception {

    DesiredCapabilities dr = null;

    dr = DesiredCapabilities.chrome();

    driver = new RemoteWebDriver(new URL("http://52.222.124.100:4444/grid/console"), dr);

}