Jenkins is an open-source automation server that facilitates continuous integration and continuous delivery (CI/CD) in software development. It helps automate parts of the software development process, including building, testing, and deploying code. Jenkins supports various version control tools, including Git, Subversion, and Mercurial, and can be extended with plugins to meet the needs of any project.
One common issue Jenkins users encounter is SCM polling failures. This problem manifests when Jenkins is unable to poll the source code management (SCM) system to detect changes in the codebase. As a result, builds may not trigger automatically, leading to delays in the CI/CD pipeline.
When SCM polling fails, you might see error messages such as:
ERROR: Failed to poll SCMhudson.plugins.git.GitException: Command "git fetch" returned status code 128The issue identified as JENKINS-414 relates to SCM polling failures. This problem can arise due to several reasons, including incorrect SCM configurations, invalid credentials, or network connectivity issues. Understanding the root cause is crucial for resolving the problem effectively.
To resolve SCM polling failures in Jenkins, follow these steps:
Ensure that the repository URL and branch name are correctly configured in the Jenkins job. Navigate to the job configuration page and check the SCM section for any discrepancies.
Ensure that the credentials used for accessing the SCM are valid and have the necessary permissions. You can manage credentials in Jenkins by going to Manage Jenkins > Manage Credentials. Update or replace any expired or incorrect credentials.
Manually test the repository access from the Jenkins server. Use the following command to check connectivity:
git ls-remote <repository-url>
If this command fails, investigate network settings or firewall rules that might be blocking access.
Ensure that the Jenkins server has network access to the SCM server. Check for any firewall or proxy settings that might be interfering with connectivity. You can also review Jenkins logs for any network-related errors.
For more information on configuring SCM in Jenkins, refer to the Jenkins SCM Documentation. If the issue persists, consider reaching out to the Jenkins Community for further assistance.
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