Poll SCM configuration in Jenkins - Mini Project: Build & Apply

Poll SCM Configuration in Jenkins

📖 Scenario: You are setting up a Jenkins job to automatically check for changes in your source code repository. This helps Jenkins know when to start a new build without manual intervention.Polling SCM means Jenkins will look at the repository at regular intervals to see if there are any new changes.

🎯 Goal: Configure a Jenkins job to poll the SCM repository every 5 minutes using the correct cron syntax.You will create the polling schedule, add it to the job configuration, and verify the polling setup.

📋 What You'll Learn

Create a variable called poll_schedule with the cron expression for every 5 minutes

Add the poll_schedule variable to the Jenkins job configuration under scm polling

Use the exact cron syntax H/5 * * * * for polling every 5 minutes

Print the polling schedule to confirm the setup

💡 Why This Matters

🌍 Real World

Polling SCM in Jenkins automates build triggers by checking for code changes regularly, saving time and reducing manual work.

💼 Career

Understanding Poll SCM configuration is essential for DevOps engineers and Jenkins administrators to maintain continuous integration pipelines.

1

Create the polling schedule variable

Create a variable called poll_schedule and set it to the string "H/5 * * * *" which means polling every 5 minutes.

Jenkins

# Create the poll_schedule variable with the cron expression for every 5 minutes
# Your code here

Need a hint?

The cron expression H/5 * * * * tells Jenkins to poll every 5 minutes.

2

Add polling schedule to Jenkins job configuration

Create a dictionary called jenkins_job_config with a key scm_polling set to the value of the variable poll_schedule.

Jenkins

poll_schedule = "H/5 * * * *"
# Create jenkins_job_config dictionary with scm_polling set to poll_schedule
# Your code here

Need a hint?

The Jenkins job configuration dictionary should have the key scm_polling with the polling schedule as its value.

3

Verify the polling schedule in the job config

Write a for loop using variables key and value to iterate over jenkins_job_config.items(). Inside the loop, print the key and value separated by a colon and a space.

Jenkins

poll_schedule = "H/5 * * * *"
jenkins_job_config = {"scm_polling": poll_schedule}
# Use a for loop with key and value to print each item in jenkins_job_config
# Your code here

Need a hint?

Use for key, value in jenkins_job_config.items(): to loop through the dictionary and print each key and value.

4

Display the polling schedule output

Write a print statement to display the value of poll_schedule exactly as it is.

Jenkins

poll_schedule = "H/5 * * * *"
jenkins_job_config = {"scm_polling": poll_schedule}
for key, value in jenkins_job_config.items():
    print(f"{key}: {value}")
# Print the poll_schedule variable
# Your code here

Need a hint?

Use print(poll_schedule) to show the polling schedule string.