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Why is it important to map the container port 4444 to a host port when running Selenium in Docker?

hard📝 Conceptual Q10 of 15
Selenium Python - CI/CD Integration
Why is it important to map the container port 4444 to a host port when running Selenium in Docker?
ATo reduce the memory usage of the container
BTo allow the test scripts on the host machine to communicate with the Selenium server inside the container
CTo enable Docker to automatically update the Selenium server
DTo increase the container's internal browser speed
Step-by-Step Solution
Solution:
  1. Step 1: Understand port mapping purpose

    Port mapping exposes container ports to the host, enabling communication between host and container.
  2. Step 2: Relate to Selenium server accessibility

    Mapping port 4444 allows test scripts running on host to send commands to Selenium server inside container.
  3. Final Answer:

    To allow the test scripts on the host machine to communicate with the Selenium server inside the container -> Option B
  4. Quick Check:

    Port mapping enables host-container communication [OK]
Quick Trick: Map ports to let host communicate with container services [OK]
Common Mistakes:
  • Thinking port mapping affects browser speed
  • Believing Docker updates server via port mapping
  • Assuming port mapping reduces container memory

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