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From j...@javajet.com
Subject Replicating nodes through firewall
Date Wed, 16 Jun 2010 14:34:56 GMT
I am trying to set up replication among three cassandra nodes. I believe 
it is because I am not setting the correct seed hostnames in 
storage-conf.xml. How can I set up node communication through the NAT on 
firewall. 

Two nodes will be on my network with private ip 192.168.15.86 and 
192.168.15.88. Port forwarding from my router's public ip to ONE internal 
node ip: 192.168.15.86. I have port forwarding to 192.168.15.86 set up for 
JMX port 8088 and cassandra port 9160.

I am using the hosts file to define the ip numbers for the cassandra 
nodes:
192.168.15.86    node1_rocinante
192.168.15.88    node2_spork
<<not shown>>      node3_rackspace

I can not seem to communicate from my internal node to the cassandra node 
at rackspace over port 8088 using "nodetool" or jmx gui, although I can 
telnet to both 8088 and cassandra port 9160 from shell. Here are JMX JAVA 
OPTS for cassandra on my node:
        -Dcom.sun.management.jmxremote.port=8088 
        -Dcom.sun.management.jmxremote.ssl=false 
        -Dcom.sun.management.jmxremote.authenticate=false 
        -Djava.rmi.server.hostname=node1_rocinante



Here is the netstat output showing the private ip rackspace cassandra node 
192.168.100.50 trying to handshake but failing because the nodes are 
assigned my private ip numbers 192.168.15.88, 192.168.15.86. For review, 
rackspace


tcp        0      1 192.168.100.50:39671        192.168.15.88:7000  
SYN_SENT    26725/java
tcp        0      1 192.168.100.50:39670        192.168.15.86:7000  
SYN_SENT    26725/java


Here are what I think are pertinent example settings in the 
storage-conf.xml for an internal node:
:

...
  <Seeds>
        <Seed>node1_rocinante</Seed>
        <Seed>node2_spork</Seed>
        <Seed>node3_rackspace</Seed>
</Seeds>
...
  <ListenAddress>node1_rocinante</ListenAddress>
  <!-- internal communications port -->
  <StoragePort>7000</StoragePort>
...





Jeffrey Griffin, Developer
JavaJet Consulting  LLC
 o: 1.717.533.5557
m: 1.717.419.2869
skype: javajet.coder
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