I am using Ubuntu 15.10 64 bits with OpenJDK 1.8.0_66. Cassandra 3.3 and OpsCenter 5.2.4 are installed from apt packages and running locally. I am using the following sources.
deb http://www.apache.org/dist/cassandra/debian 33x main
deb http://debian.datastax.com/community stable main
The OpsCenter doc says: "In Add Cluster, enter the Hostnames or IP addresses of two or three nodes in the cluster, set the JMX and Native Transport ports, and click Save Cluster".
I have a single-node cluster, so I don't have two or three IP addresses to enter. When I enter the address of the node, I get the following message: "Error creating cluster: Unable to connect to cluster. Error is: Unable to connect to any seed nodes, tried ['127.0.0.1']".
I am using the default ports. netstat -an gives among others the following lines.
tcp 0 0 127.0.0.1:7199 0.0.0.0:* LISTEN
tcp6 0 0 127.0.0.1:9042 :::* LISTEN
nodetool status is working fine.
$ nodetool status
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns Host ID Rack
UN 127.0.0.1 201.17 KB 256 ? 04da2c59-1a88-4ed3-9af9-8f64ae27e9ac rack1
Note: Non-system keyspaces don't have the same replication settings, effective ownership information is meaningless
So is cqlsh.
$ cqlsh
Connected to Test Cluster at 127.0.0.1:9042.
[cqlsh 5.0.1 | Cassandra 3.3 | CQL spec 3.4.0 | Native protocol v4]
Use HELP for help.
cqlsh>
After looking at other questions I tried uncommenting the following in /etc/cassandra/cassandra-env.sh. I tried both localhost and 127.0.0.1. It did not help.
JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=<hostname>"
There is nothing in /var/log/cassandra/debug.log or /var/log/cassandra/system.log when the connection attempts fail. The only log messages are from Cassandra starting/stopping.
Is it possible at all to use OpsCenter with a single-node cluster? If so, what might I be missing?
