Sangharsh Agarwal

Elastic Jenkins: Scaling Workers With Docker Swarm and the Jenkins Swarm Plugin

Manually registering Jenkins build agents becomes increasingly inefficient as CI/CD infrastructure grows. Combining Docker Swarm with the Jenkins Swarm Plugin allows workers to register automatically and makes scaling build capacity as simple as changing replica counts. But automation introduces trade-offs involving shared credentials, workload isolation and scaling down active builds. A practical implementation demonstrates how WebSocket connections, Docker secrets and CI smoke tests can improve the setup while exposing important security limitations.