Why We Replaced Jenkins 2.460 with GitLab CI 16.10: A DevSecOps Opinion Piece

For three years, Jenkins 2.460 was the backbone of our CI/CD pipeline. It was reliable, familiar, and got the job done — until it didn’t. As our team scaled to 40+ engineers and our DevSecOps requirements grew more complex, Jenkins shifted from a productivity tool to a maintenance burden. After a 6-month evaluation, we migrated entirely to GitLab CI 16.10. Here’s why, and what we learned.

The Breaking Point with Jenkins 2.460

Jenkins has long been the de facto standard for CI/CD, but its age shows in a modern DevSecOps context. Our pain points with 2.460 were threefold:

• Plugin Hell: We relied on 47 plugins to handle everything from SCM integration to security scanning. Plugin compatibility issues after every Jenkins update caused 4+ hours of unplanned downtime per quarter, and deprecated plugins left us with unsupported security tools.
• Disjointed DevSecOps Workflow: We used separate tools for SCM (GitLab), CI (Jenkins), container scanning (Anchore), and compliance reporting (custom scripts). Context switching between 5+ tools slowed developer velocity by an estimated 15%.
• Security Gaps: Jenkins’ native RBAC was clunky, audit logs were hard to parse, and third-party security plugins often lagged behind vulnerability disclosures. We missed 3 critical dependency vulnerabilities in 2023 because our Jenkins-linked scanning tool hadn’t been updated.

Why GitLab CI 16.10 Won Us Over

We evaluated 4 CI/CD tools (Jenkins LTS, GitHub Actions, CircleCI, GitLab CI) against our core DevSecOps criteria: unified toolchain, native security, low maintenance, and pipeline flexibility. GitLab CI 16.10 checked every box:

• Unified DevSecOps Platform: GitLab bundles SCM, CI/CD, container registry, and security scanning in a single interface. Our engineers no longer switch between tabs to check code, pipeline status, or vulnerability reports.
• Native Security Features: GitLab 16.10 includes built-in SAST, DAST, dependency scanning, container scanning, and compliance pipeline templates. No third-party plugins required — all security tools are maintained by the GitLab team and updated automatically with the platform.
• Low Maintenance Overhead: We run GitLab on our private Kubernetes cluster, but even self-managed instances require far less upkeep than Jenkins. No plugin management, automated patch updates, and a single configuration file (.gitlab-ci.yml) for all pipeline logic.
• Pipeline as Code Done Right: Unlike Jenkins’ Groovy-based Jenkinsfiles, .gitlab-ci.yml is YAML-based, easy to read, and versioned alongside application code. We reduced pipeline configuration errors by 60% after migration.

Our Migration Journey

Migrating 120+ Jenkins pipelines to GitLab CI took 8 weeks, with zero downtime for active development. Key steps included:

• Auditing all Jenkins plugins to map functionality to native GitLab features or approved integrations.
• Converting Jenkinsfiles to .gitlab-ci.yml using GitLab’s Jenkinsfile converter tool (which handled 70% of the work automatically).
• Running parallel Jenkins and GitLab pipelines for 2 weeks to validate parity before cutting over.

We hit one major snag: Jenkins’ flexible (but messy) parameterization didn’t map 1:1 to GitLab’s more structured pipeline variables. Retraining 10 senior engineers on GitLab’s variable scoping took 3 days, but the long-term payoff was worth it.

DevSecOps Wins 6 Months Post-Migration

The impact on our DevSecOps workflow has been measurable:

• 30% Faster Pipeline Runs: GitLab’s native caching and parallel job execution cut average build times from 22 minutes to 15 minutes.
• Zero Security Plugin Outages: Native security scanning means no more broken plugins after updates. We catch 40% more vulnerabilities during the build phase than we did with Jenkins.
• 75% Reduction in CI/CD Maintenance Time: Our ops team spends 6 hours per month on GitLab upkeep, down from 24 hours per month for Jenkins.
• Automated Compliance Reporting: GitLab’s audit logs and compliance dashboards replaced 10+ custom scripts, cutting compliance reporting time from 8 hours to 15 minutes per audit.

Is GitLab CI 16.10 Right for You?

This isn’t a blanket recommendation for every team. If you have a small team with simple pipelines and deep Jenkins expertise, sticking with Jenkins may make sense. But for teams prioritizing DevSecOps, unified toolchains, and reducing operational overhead, GitLab CI 16.10 is a clear winner.

For us, replacing Jenkins 2.460 was about more than swapping CI tools — it was about aligning our toolchain with our DevSecOps values. We’ve eliminated context switching, closed security gaps, and freed up ops time to focus on higher-value work. We haven’t looked back.