Cassandra port usage - how are the ports used?

Question

When experimenting with Cassandra I've observed that Cassandra listens to the following ports:

• TCP *:8080
• TCP *:8888
• TCP *:57311
• TCP *:57312
• TCP 127.0.0.1:7000
• TCP 127.0.0.1:9160
• UDP 127.0.0.1:700

How does Cassandra use each of the ports listed?

Answer 1

8080 - JMX (remote)

8888 - Remote debugger (removed in 0.6.0)

7000 - Used internal by Cassandra
(7001 - Obsolete, removed in 0.6.0. Used for membership communication, aka gossip)

9160 - Thrift client API

Cassandra FAQ What ports does Cassandra use?

Answer 2

I resolved issue using below steps :

1. Stop cassandara services

   sudo su -
   systemctl stop datastax-agent
   systemctl stop opscenterd
   systemctl stop app-dse
   

2. Take backup and Change port from 9042 to 9035

   cp /opt/dse/resources/cassandra/conf/cassandra.yaml /opt/dse/resources/cassandra/conf/bkp_cassandra.yaml
   Vi /opt/dse/resources/cassandra/conf/cassandra.yaml
   native_transport_port: 9035
   

3. Start Cassandra services

   systemctl start datastax-agent
   systemctl start opscenterd
   systemctl start app-dse
   

4. create cqlshrc file.

   vi  /root/.cassandra/cqlshrc
   
   [connection]
   hostname = 198.168.1.100
   port = 9035
   

Thanks, Mahesh

Answer 3

For Apache Cassandra 2.0 you need to take into account the following TCP ports: (See EC2 security group configuration and Apache Cassandra FAQ)

Cassandra

• 7199 JMX monitoring port
• 1024 - 65355 Random port required by JMX. Starting with Java 7u4 a specific port can be specified using the com.sun.management.jmxremote.rmi.port property.
• 7000 Inter-node cluster
• 7001 SSL inter-node cluster
• 9042 CQL Native Transport Port
• 9160 Thrift

DataStax OpsCenter

• 61620 opscenterd daemon
• 61621 Agent
• 8888 Website

Architecture

A possible architecture with Cassandra + OpsCenter on EC2 could look like this:

Answer 4

In addition to the above answers, as part of configuring your firewall, if you are using SSH then use port 22.

Answer 5

JMX now uses port 7199 instead of port 8080 (as of Cassandra 0.8.xx).

This is configurable in your cassandra-env.sh file, but the default is 7199.

Answer 6

@Schildmeijer is largely right, however port 7001 is still used when using TLS Encrypted Internode communication

So my complete list would be for current versions of Cassandra:

• 7199 - JMX (was 8080 pre Cassandra 0.8.xx)
• 7000 - Internode communication (not used if TLS enabled)
• 7001 - TLS Internode communication (used if TLS enabled)
• 9160 - Thrift client API
• 9042 - CQL native transport port