Jenkins vs GitHub Actions
The legacy CI king vs the modern integrated platform. Compare Jenkins and GitHub Actions on flexibility, maintenance, and developer experience.
| Criteria | Jenkins | GitHub Actions |
|---|---|---|
| Setup & Maintenance | Self-hosted. Requires JVM, plugin management, backup, and security patching. Significant operational overhead. Can run anywhere. | Fully managed by GitHub. No infrastructure to maintain. GitHub-hosted or self-hosted runners. Zero ops for managed runners. |
| Pipeline as Code | Jenkinsfile (Groovy DSL). Declarative and scripted pipelines. Shared libraries for reuse. Complex but extremely flexible. | YAML workflows. Reusable workflows and composite actions. Less flexible than Groovy but more approachable. |
| Plugin Ecosystem | 1,800+ plugins. Covers every integration imaginable. Quality varies. Plugin conflicts and security issues are common. | 20,000+ marketplace actions. Easier to create and share. Version pinning with SHA for security. |
| Scalability | Scale with agents (static or dynamic). Kubernetes plugin for elastic agents. Can handle massive builds but requires tuning. | Auto-scaling managed runners. Larger runners on paid plans. Self-hosted runner groups for enterprises. |
| Security | Full control over infrastructure and secrets. RBAC via plugins. But: attack surface is large (JVM, plugins, agents). | OIDC for cloud authentication. Encrypted secrets. Environment protection rules. Smaller attack surface for managed runners. |
| Cost | Free (open-source). Costs are infrastructure + ops staff time. Hidden costs in maintenance and downtime. | Free for public repos. 2,000 min/month for private repos (free tier). Pay-per-minute beyond. No ops cost for managed runners. |
Verdict
Choose GitHub Actions for new projects on GitHub that want zero CI/CD infrastructure. Choose Jenkins if you need maximum flexibility, are running on-premises, or have complex pipelines that require Groovy scripting.
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