Apache Cassandra 1.2 Documentation

Configuring firewall port access

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If you have a firewall running on the nodes in your Cassandra cluster, you must open up the following ports to allow communication between the nodes, including certain Cassandra ports. If this isn’t done, when you start Cassandra on a node, the node acts as a standalone database server rather than joining the database cluster.

Port Description
Public Facing Ports
22 SSH port.
8888 OpsCenter website port.
Cassandra Inter-node Ports
1024+ JMX reconnection/loopback ports. See description for port 7199.
7000 Cassandra inter-node cluster communication.
7199 Cassandra JMX monitoring port. After the initial handshake, the JMX protocol requires that the client reconnects on a randomly chosen port (1024+).
9160 Cassandra client port (Thrift).
OpsCenter ports
61620 OpsCenter monitoring port. The opscenterd daemon listens on this port for TCP traffic coming from the agent.
61621 OpsCenter agent port. The agents listen on this port for SSL traffic initiated by OpsCenter.