If webserver01 is defined in both a node group and site.pp, what would happen during a Puppet agent run?

In the context of Puppet, if a node is specified in both a node group and in the site.pp manifest, the system's behavior is guided by how Puppet handles variable scoping and priority. When a node is defined in both places, this can lead to a compilation error due to conflicting configurations at the same scope level. Puppet enforces a strict compilation rule that does not allow multiple declarations of the same variable or resource within the same scope. This ensures that there is clarity and predictability in how Puppet applies configurations, preventing ambiguity in resource assignments.

When Puppet compiles the catalog for the agent run, it will throw an error if it encounters variables or resources that are defined more than once in the same scope, which is exactly what happens when webserver01 is defined both in the node group and in the site.pp. This mechanism helps maintain a clear structure within Puppet manifests and avoids unintentional overrides that could lead to inconsistent states in the managed infrastructure.