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From Tyler Hobbs <ty...@datastax.com>
Subject Re: cluster IP question and Jconsole?
Date Wed, 20 Apr 2011 18:59:06 GMT
See the first entry in http://wiki.apache.org/cassandra/JmxGotchas

On Wed, Apr 20, 2011 at 9:54 AM, tinhuty he <tinhuty@hotmail.com> wrote:

> Maki,
>
> Yes you are right, 8081 is mx4j port, the JMX_PORT is 8001 in the
> cassandra-env.sh.
>
> in the cassandra Linux server itself, I can run this successfully:
> nodetool -host xxxxx -p 8001 ring
> xxxxx is the actually IP address
>
> however when I run the same command in another windows machine(which has
> the cassandra windows version extracted), I am getting exception like below,
> one thing puzzled me is that the command trying to connect to ip xxxxx, but
> the exception claimed: "Connection refused to host: 127.0.0.1". Is there
> anything else that I need to config or...? I guess this is probably the
> reason that jconsole can't connect to port 8001 remotely either? Thanks for
> any advice!
>
> D:\apache-cassandra-0.7.4\bin>nodetool -host xxxxx -p 8001 ring
> Starting NodeTool
> Error connection to remote JMX agent!
> java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested
> exception is:
>       java.net.ConnectException: Connection refused: connect
>       at sun.rmi.transport.tcp.TCPEndpoint.newSocket(Unknown Source)
>       at sun.rmi.transport.tcp.TCPChannel.createConnection(Unknown Source)
>       at sun.rmi.transport.tcp.TCPChannel.newConnection(Unknown Source)
>       at sun.rmi.server.UnicastRef.invoke(Unknown Source)
>       at javax.management.remote.rmi.RMIServerImpl_Stub.newClient(Unknown
> Source)
>       at javax.management.remote.rmi.RMIConnector.getConnection(Unknown
> Source)
>       at javax.management.remote.rmi.RMIConnector.connect(Unknown Source)
>       at javax.management.remote.JMXConnectorFactory.connect(Unknown
> Source)
>       at org.apache.cassandra.tools.NodeProbe.connect(NodeProbe.java:137)
>       at org.apache.cassandra.tools.NodeProbe.<init>(NodeProbe.java:107)
>       at org.apache.cassandra.tools.NodeCmd.main(NodeCmd.java:511)
> Caused by: java.net.ConnectException: Connection refused: connect
>       at java.net.PlainSocketImpl.socketConnect(Native Method)
>       at java.net.PlainSocketImpl.doConnect(Unknown Source)
>       at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
>       at java.net.PlainSocketImpl.connect(Unknown Source)
>       at java.net.SocksSocketImpl.connect(Unknown Source)
>       at java.net.Socket.connect(Unknown Source)
>       at java.net.Socket.connect(Unknown Source)
>       at java.net.Socket.<init>(Unknown Source)
>       at java.net.Socket.<init>(Unknown Source)
>       at
> sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(Unknown Source)
>       at
> sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(Unknown Source)
>       ... 11 more
>
>
>
> -----Original Message----- From: Watanabe Maki
> Sent: Saturday, April 16, 2011 1:45 AM
>
> To: user@cassandra.apache.org
> Cc: <user@cassandra.apache.org>
>
> Subject: Re: cluster IP question and Jconsole?
>
> 8081 is your mx4j port, isn't it? You need to connect jconsole to JMX_PORT
> specified in cassandra-env.sh.
>
> maki
>
> From iPhone
>
>
> On 2011/04/16, at 13:56, tinhuty he <tinhuty@hotmail.com> wrote:
>
>  Maki, thanks for your reply. for the second question, I wasn't using the
>> loopback address, I was using the actually IP address for that server. I am
>> able to telnet to that IP on port 8081, but using jconsole failed.
>>
>> -----Original Message----- From: Maki Watanabe
>> Sent: Friday, April 15, 2011 9:43 PM
>> To: user@cassandra.apache.org
>> Cc: tinhuty he
>> Subject: Re: cluster IP question and Jconsole?
>>
>> 127.0.0.2 to 127.0.0.5 are valid IP addresses. Those are just alias
>> addresses for your loopback interface.
>> Verify:
>> % ifconfig -a
>>
>> 127.0.0.0/8 is for loopback, so you can't connect this address from
>> remote machines.
>> You may be able configure SSH port forwarding from your monitroing
>> host to cassandra node though I haven't try.
>>
>> maki
>>
>> 2011/4/16 tinhuty he <tinhuty@hotmail.com>:
>>
>>> I have followed the description here
>>>
>>> http://www.edwardcapriolo.com/roller/edwardcapriolo/entry/lauching_5_node_cassandra_clusters
>>> to created 5 instances of cassandra in one CentOS 5.5 machine. using
>>> nodetool shows the 5 nodes are all running fine.
>>>
>>> Note the 5 nodes are using IP 127.0.0.1 to 127.0.0.5. I understand
>>> 127.0.0.1
>>> is pointing to local server, but how about 127.0.0.2 to 127.0.0.5? looks
>>> to
>>> me that they are not valid IP? how come all 5 nodes are working ok?
>>>
>>> Another question. I have installed MX4J in instance 127.0.0.1 on port
>>> 8081.
>>> I am able to connect to http://server:8081/ from the browser. However
>>> how do
>>> I connect using Jconsole that was installed in another windows
>>> machines?(since my CentOS5.5 doesn't have X installed, only SSH allowed).
>>>
>>> Thanks.
>>>
>>
>>


-- 
Tyler Hobbs
Software Engineer, DataStax <http://datastax.com/>
Maintainer of the pycassa <http://github.com/pycassa/pycassa> Cassandra
Python client library

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