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From Dave Viner <>
Subject Re: Cassandra nodes on EC2 in two different regions not communicating
Date Wed, 23 Feb 2011 06:06:15 GMT
If you login to one of the nodes, can you telnet to port 7000 on the other

If not, then almost certainly it's a firewall/Security Group issue.

You can find out the security groups for any node by logging in, and then

% curl ""

Assuming that both nodes are in the same security group, ensure that the SG
is configured to allow other members of the SG to communicate on port 7000
to each other.

Dave Viner

On Tue, Feb 22, 2011 at 8:59 PM, Himanshi Sharma <>wrote:

> Hi,
> I am new to Cassandra. I m running Cassandra on EC2. I configured Cassandra
> cluster on two instances in different regions.
> But when I am trying the nodetool command with ring option, I am getting
> only single node.
> How to make these two nodes communicate with each other. I have already
> opened required ports. i.e 7000, 8080, 9160 in respective
> security groups. Plz help me with this.
> Regards,
> Himanshi Sharma
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