Connecting

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Connecting

Cassandra connection
bin/cqlsh is an interactive command line interface for Cassandra. You can define the schema and interact with data using it. Run the following command to connect to your local Cassandra instance:

$ bin/cqlsh

You should see the following prompt, if successful:

Connected to Test Cluster at localhost:9160.
[cqlsh 2.3.0 | Cassandra 1.2.2 | CQL spec 3.0.0 | Thrift protocol 19.35.0] Use HELP for help.

Multi-node connection
Cassandra nodes exchange information about one another using a mechanism called Gossip, but to get the ball rolling a newly started node needs to know of at least one other, this is called a Seed. It’s customary to pick a small number of relatively stable nodes to serve as your seeds, but there is no hard-and-fast rule here. Do make sure that each seed also knows of at least one other, remember, the goal is to avoid a chicken-and-egg scenario and provide an avenue for all nodes in the cluster to discover one another.

In addition to seeds, you’ll also need to configure the IP interface to listen on for Gossip and CQL, (listen_address and rpc_address respectively). Use a ‘listen_address that will be reachable from the listen_address used on all other nodes, and a rpc_address` that will be accessible to clients.

Once everything is configured and the nodes are running, use the bin/nodetool status utility to verify a properly connected cluster.