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h1. Situation
Assume there are only one machine for deployment. Set up the build so that only one deployment step can run on the deployment machine even if multiple builds try to deploy.

h1. Demonstration
# Visit the [demo project|], and hit the run button to trigger all children configurations concurrently.
# Check latest build of [child project1|] and [child project2|] respectively: only _deploy_ step of the one build will run, another will be put into wait state until current running deploy step finishes.

h1. Resolution
# Switch to [resources tab|] and a resource named "Deployment Environment" is defined with only one agent providing the resource.
# Switch to steps definition of [child project1|] and [child project2|], and check definition of step _deploy_. The node selection property is set to run on the node with resource _Deployment Environment_.