Selenium With Docker
Using Selenium with Docker is an efficient way to set up isolated testing environments for web applications. This approach is highly scalable and ensures consistency across different testing environments. Here’s a guide on how to use Selenium with Docker:
1. Why Use Selenium with Docker?
- Consistency: Docker containers ensure that Selenium runs in a consistent environment, eliminating the “it works on my machine” problem.
- Scalability: Easily scale up or down your testing environment by spinning up more or fewer containers.
- Isolation: Tests run in isolated environments, avoiding conflicts and inconsistencies.
2. Prerequisites:
- Install Docker on your machine.
- Basic understanding of Docker concepts like images, containers, Dockerfiles, and Docker Compose.
3. Using Selenium Docker Images:
Selenium provides official Docker images for Selenium Standalone Server, Selenium Hub, and Node configurations (Chrome, Firefox).
Pulling Selenium Docker Images:
docker pull selenium/standalone-chrome
docker pull selenium/standalone-firefox
# or use selenium/hub, selenium/node-chrome, selenium/node-firefox for grid setup
4. Running Selenium Standalone Server in Docker:
To run a Selenium Standalone Server for Chrome:
docker run -d -p 4444:4444 --shm-size="2g" selenium/standalone-chrome
-d
runs the container in detached mode.-p
maps the port from the container to your host.--shm-size
sets the shared memory size, which is important for Chrome.
5. Connecting Your Tests to Selenium in Docker:
In your Selenium test scripts, connect to the Selenium Server running inside the Docker container:
# Example in Python
from selenium import webdriver
driver = webdriver.Remote(
command_executor='http://localhost:4444/wd/hub',
desired_capabilities={'browserName': 'chrome'}
)
6. Selenium Grid with Docker:
For parallel execution and a more advanced setup, use Selenium Grid with Docker:
- Hub and Nodes: Start a Selenium Hub and connect nodes to it.
- Use Docker Compose to define and run multi-container Docker applications for complex grid setups.
Example docker-compose.yml
for Selenium Grid:
version: '3'
services:
selenium-hub:
image: selenium/hub
ports:
- "4444:4444"
chrome:
image: selenium/node-chrome
depends_on:
- selenium-hub
environment:
- HUB_HOST=selenium-hub
7. Best Practices:
- Resource Allocation: Ensure your Docker host has enough resources (CPU, memory) to run your test environment.
- Network Configuration: Properly configure network settings, especially if your tests need to access applications on your host machine or the internet.
- Logging and Monitoring: Implement logging and monitoring for your Dockerized Selenium environment to keep track of test executions and potential issues.
8. Cleaning Up:
After your test runs, stop and remove the containers to free up system resources.
Demo Day 1 Video:
Conclusion:
Unogeeks is the No.1 IT Training Institute for Selenium Training. Anyone Disagree? Please drop in a comment
You can check out our other latest blogs on Selenium here – Selenium Blogs
You can check out our Best In Class Selenium Training Details here – Selenium Training
Follow & Connect with us:
———————————-
For Training inquiries:
Call/Whatsapp: +91 73960 33555
Mail us at: info@unogeeks.com
Our Website ➜ https://unogeeks.com
Follow us:
Instagram: https://www.instagram.com/unogeeks
Facebook:https://www.facebook.com/UnogeeksSoftwareTrainingInstitute
Twitter: https://twitter.com/unogeeks