Nodetool is Cassandra's collection of delivered tools that help with a variety of different operational and diagnostic functions. As previously mentioned, probably the most common nodetool command that you will run is nodetool status, which should produce output similar to this:
$ nodetool statusDatacenter: LakesidePark========================Status=Up/Down|/ State=Normal/Leaving/Joining/Moving-- Address Load Tokens Owns Host ID RackUN 192.168.0.100 84.15 MiB 16 100.0% 71700e62-2e28-4974-93e1-a2ad3f... r40UN 192.168.0.102 83.27 MiB 16 100.0% c3e61934-5fc1-4795-a05a-28443e... r40UN 192.168.0.101 83.99 MiB 16 100.0% fd352577-6be5-4d93-8251-15a74f... r40
Additional information about your node(s) and cluster can be obtained by running ...