[Solved] You wrote this Docker Compose snippet for Selenium Grid but tests fail to run on Chrome nodes. What is the likely error? services: selenium-hub: image: selenium/hub:4.9.0-20230427 ports:... | Selenium Python

Selenium Python - Selenium Grid

You wrote this Docker Compose snippet for Selenium Grid but tests fail to run on Chrome nodes. What is the likely error?

services:
  selenium-hub:
    image: selenium/hub:4.9.0-20230427
    ports:
      - 4444:4444
  chrome:
    image: selenium/node-chrome:4.9.0-20230427
    depends_on:
      - selenium-hub
    environment:
      - SE_EVENT_BUS_HOST=selenium-hub
      - SE_EVENT_BUS_PUBLISH_PORT=4442
      - SE_EVENT_BUS_SUBSCRIBE_PORT=4443

AMissing network configuration to connect node and hub

BIncorrect image version for Chrome node

CPorts 4442 and 4443 should be exposed in node service

DHub port 4444 should be changed to 4445

Step-by-Step Solution

Solution:

Step 1: Check Docker Compose networking
Services must be on the same network to communicate; no network is defined here.
Step 2: Impact of missing network
Without shared network, node cannot reach hub at SE_EVENT_BUS_HOST, causing test failures.
Final Answer:
Missing network configuration to connect node and hub -> Option A
Quick Check:
Shared network needed for node-hub communication = A [OK]

Quick Trick: Define shared network in Docker Compose for node-hub communication [OK]

Common Mistakes:

Assuming ports 4442/4443 must be exposed externally
Changing hub port unnecessarily
Using wrong image version without checking network

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More Selenium Python Quizzes

You wrote this Docker Compose snippet for Selenium Grid but tests fail to run on Chrome nodes. What is the likely error?

Step 1: Check Docker Compose networking

Step 2: Impact of missing network

Final Answer:

Quick Check:

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