Getting "Connection refused" when running nodetool on Cassandra cluster on AWS EC2-CodePudding

I just did the setup of a cassandra cluster. I have changed the seed, listen_adress and broadcast_adress in the cassandra.yalm file. But when I run the command

$ nodetool flush system

Cmd retrun this error,

nodetool: Failed to connect to '127.0.0.1:7199' - ConnectException:
'Connection refused (Connection refused)'.

in the file etc/cassandra/cassandra-env.sh I made the modification JVM_OPTS as on the screenshot

I use aws at the beginning I was on a t2.micro server. But I switched to a t2.large as recommended in many articles.

Finally, my ports are open as shown in this screenshot and I'm use ubuntu.

CodePudding user response：

By default, remote JMX connections to Cassandra nodes are disabled. If you're running nodetool commands on the EC2 instance itself, it isn't necessary to modify the JVM options cassandra-env.sh.

In fact, we discourage allowing remote JMX connections for security reasons. Only allow remote access if you're an expert and know what you're doing. Cheers!