Migration Automation: Easing the Jenkins → GHA shift with help from AI

Summary

The article outlines a project undertaken at Slack to automate the migration of CI jobs from Jenkins to GitHub Actions (GHA). It details the development of a conversion tool that leverages the GitHub Actions Importer and Python scripting, with the aim of reducing migration time and enhancing developer experience. The tool addresses common issues encountered during the migration process, such as unsupported Jenkins build steps, and incorporates Large Language Models (LLMs) for more complex corrections. The approach taken not only streamlines the migration but also provides insights into optimizing CI workflows for better performance and reliability.

Key Learnings

• 1The GitHub Actions Importer can automate the initial migration of Jenkins pipelines, but manual corrections are often necessary for unsupported steps.
• 2Using LLMs can significantly enhance the accuracy of converting complex actions between Jenkins and GitHub Actions workflows.
• 3Identifying and addressing the most common unsupported Jenkins build steps can simplify the migration process and reduce developer workload.
• 4Effective prompt engineering is crucial for maximizing the performance of LLMs in automating code corrections.
• 5The overall impact of the migration tool is substantial, potentially saving over 1,300 hours of developer time.

Who Should Read This

Senior DevOps Engineers implementing CI/CD pipelines in large-scale environments transitioning from Jenkins to GitHub Actions.

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