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From "Timothy P. Dunphy" <>
Subject Re: cassandra monitoring
Date Tue, 31 Dec 2013 03:08:13 GMT
Hi Aaron, 

You were right. JMX is running on port 7199, it's just the web interface that's on 8081. My
mistake. But what I did was to delete my existing cluster and try to build a new cluster within
opscenter and try pointing it at my existing cassandra node. Just one node for now, but when
we go to production we plan to scale out. 

When I tried to install the agent with opscetner, the installation begins but fails with this
message a few moments later: 

Install Errored: Failure installing agent on Error output: /var/lib/opscenter/ssl/agentKeyStore.pem:
No such file or directory Exit code: 1 

I was wondering where I could go from here. Also I would like to password protect my OpsCenter
installation (assuming I can ever get any useful data into it). Are there any docs on how
I can do that? 


----- Original Message -----

From: "Aaron Morton" <> 
To: "Cassandra User" <> 
Sent: Monday, December 30, 2013 9:19:05 PM 
Subject: Re: cassandra monitoring 

JMX is doing it's thing on the cassandra node and is running on port 8081 

Have you set the JMX port for the cluster in Ops Centre ? The default JMX port has been 7199
for a while. 

Off the top of the my head it’s in the same area where you specify the initial nodes in
the cluster, maybe behind an “Advanced” button. 

The Ops Centre agent talks to the server to find out what JMX port it should use to talk to
the local Cassandra install. 

Also check the logs in /var/log/datastax 


Aaron Morton 
New Zealand 

Co-Founder & Principal Consultant 
Apache Cassandra Consulting 

On 30/12/2013, at 2:21 am, Tim Dunphy < > wrote: 


Hi all, 

I'm attempting to configure datastax agent so that opscenter can monitor cassandra. I am running
cassandra 2.0.3 and opscenter-4.0.1-2.noarch running. Cassandra is running on a centos 5.9
host and the opscenter host is running on centos 6.5 

A ps shows the agent running 

[root@beta:~] #ps -ef | grep datastax | grep -v grep 
root 2166 1 0 03:31 ? 00:00:00 /bin/bash /usr/share/datastax-agent/bin/datastax_agent_monitor

106 2187 1 0 03:31 ? 00:01:37 /etc/alternatives/javahome/bin/java -Xmx40M -Xms40M
-Dagent-pidfile=/var/run/datastax-agent/ -Dlog4j.configuration=/etc/datastax-agent/
-jar datastax-agent-4.0.2-standalone.jar /var/lib/datastax-agent/conf/address.yaml 

And the service itself claims that it is running: 

[root@beta:~] #service datastax-agent status 
datastax-agent (pid 2187) is running... 

On the cassandra node I have ports 61620 and 61621 open on the firewall. 

But if I do an lsof and look for those ports I see no activity there. 

[root@beta:~] #lsof -i :61620 
[root@beta:~] #lsof -i :61621 

And a netstat turns up nothing either: 
[root@beta:~] #netstat -tapn | egrep "(datastax|ops)" 

So I guess it should come as no surprise that the opscenter interface reports the node as

And trying to reinstall the agent remotely by clicking the 'fix' link errors out: 

g is null 

If you need to make changes, you can press "Retry" and the installations will be retried.

And also I got on another attempt: 

"Cannot call method 'getRequstStatus' of null. 

I'm really wondering why I'm doing wrong here, and how I can work my way out of this quagmire.
It would be beyond awesome to actually get this working! 

I've also attempted to get Cassandra Cluster Admin working. JMX is doing it's thing on the
cassandra node and is running on port 8081. CCA is running on the same host as the opscenter.

But cca gives me this error once I log in: 

Cassandra Cluster Admin 

Fatal error : Uncaught exception 'TTransportException' with message 'TSocket: timed out reading
4 bytes from ' in /var/www/Cassandra-Cluster-Admin/include/thrift/transport/TSocket.php:268
Stack trace: #0 /var/www/Cassandra-Cluster-Admin/include/thrift/transport/TTransport.php(87):
TSocket->read(4) #1 /var/www/Cassandra-Cluster-Admin/include/thrift/transport/TFramedTransport.php(135):
TTransport->readAll(4) #2 /var/www/Cassandra-Cluster-Admin/include/thrift/transport/TFramedTransport.php(102):
TFramedTransport->readFrame() #3 /var/www/Cassandra-Cluster-Admin/include/thrift/transport/TTransport.php(87):
TFramedTransport->read(4) #4 /var/www/Cassandra-Cluster-Admin/include/thrift/protocol/TBinaryProtocol.php(300):
TTransport->readAll(4) #5 /var/www/Cassandra-Cluster-Admin/include/thrift/protocol/TBinaryProtocol.php(192):
TBinaryProtocol->readI32(NULL) #6 /var/www/Cassandra-Cluster-Admin/include/thrift/packages/cassandra/cassandra.Cassandra.client.php(1017):
TBinaryProtocol->readMessageBegin(NULL, 0, 0) # in /var/www/Cassandra-Cluster-Admin/include/thrift/transport/TSocket.php
on line 268 

Any advice I could get on my CCA problem and /or my Opcenter problem would be great and appreciated.


GPG me!! 

gpg --keyserver --recv-keys F186197B 


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