Druid includes a set of reference configurations and launch scripts for single-machine deployments:
micro-quickstart is sized for small machines like laptops and is intended for quick evaluation use-cases.
The other configurations are intended for general use single-machine deployments. They are sized for hardware roughly based on Amazon's i3 series of EC2 instances.
The startup scripts for these example configurations run a single ZK instance along with the Druid services. You can choose to deploy ZK separately as well.
The example configurations run the Druid Coordinator and Overlord together in a single process using the optional configuration
druid.coordinator.asOverlord.enabled=true, described in the Coordinator configuration documentation.
While example configurations are provided for very large single machines, at higher scales we recommend running Druid in a clustered deployment, for fault-tolerance and reduced resource contention.