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From Dave Viner <davevi...@gmail.com>
Subject Re: Cassandra nodes on EC2 in two different regions not communicating
Date Wed, 23 Feb 2011 17:31:05 GMT
internal EC2 ips (10.xxx.xxx.xxx) work across availability zones (e.g., from
us-east-1a to us-east-1b) but do not work across regions (e.g., us-east to
us-west).  To do regions, you must use the public ip address assigned by
amazon.

Himanshi, when you log into 1 node, and telnet to port 7000 on the other
node, which IP address did you use - the 10.x address or the public ip
address?
And what is the seed/non-seed configuration in both cassandra.yaml files?

Dave Viner


On Wed, Feb 23, 2011 at 8:12 AM, Frank LoVecchio <frank@isidorey.com> wrote:

> The internal Amazon IP address is what you will want to use so you don't
> have to go through DNS anyways; not sure if this works from US-East to
> US-West, but it does make things quicker in between zones, e.g. us-east-1a
> to us-east-1b.
>
>
> On Wed, Feb 23, 2011 at 9:09 AM, Dave Viner <daveviner@gmail.com> wrote:
>
>> Try using the IP address, not the dns name in the cassandra.yaml.
>>
>> If you can telnet from one to the other on port 7000, and both nodes have
>> the other node in their config, it should work.
>>
>>  Dave Viner
>>
>>
>> On Wed, Feb 23, 2011 at 1:43 AM, Himanshi Sharma <himanshi.sharma@tcs.com
>> > wrote:
>>
>>>
>>> Ya they do. Have specified Public DNS in seed field of each node in
>>> Cassandra.yaml...nt able to figure out what the problem is ???
>>>
>>>
>>>
>>>
>>>  From: Sasha Dolgy <sdolgy@gmail.com> To: user@cassandra.apache.org
>>> Date: 02/23/2011 02:56 PM Subject: Re: Cassandra nodes on EC2 in two
>>> different regions not communicating
>>> ------------------------------
>>>
>>>
>>>
>>> did you define the other host in the cassandra.yaml ?  on both servers
>>> .... they need to know about each other
>>>
>>> On Wed, Feb 23, 2011 at 10:16 AM, Himanshi Sharma <*
>>> himanshi.sharma@tcs.com* <himanshi.sharma@tcs.com>> wrote:
>>>
>>> Thanks Dave but I am able to telnet to other instances on port 7000
>>> and when i run  ./nodetool --host *
>>> ec2-50-18-60-117.us-west-1.compute.amazonaws.com*<http://ec2-50-18-60-117.us-west-1.compute.amazonaws.com/>
ring... I can see only one node.
>>>
>>> Do we need to configure anything else in Cassandra.yaml or
>>> Cassandra-env.sh ???
>>>
>>>
>>>
>>>
>>>
>>>
>>>   From: Dave Viner <*daveviner@gmail.com* <daveviner@gmail.com>>
 To: *
>>> user@cassandra.apache.org* <user@cassandra.apache.org>  Cc: Himanshi
>>> Sharma <*himanshi.sharma@tcs.com* <himanshi.sharma@tcs.com>>  Date:
02/23/2011
>>> 11:36 AM  Subject: Re: Cassandra nodes on EC2 in two different regions
>>> not communicating
>>>
>>>  ------------------------------
>>>
>>>
>>>
>>> If you login to one of the nodes, can you telnet to port 7000 on the
>>> other node?
>>>
>>> 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
>>> running:
>>>
>>> % curl "*http://169.254.169.254/latest/meta-data/security-groups*<http://169.254.169.254/latest/meta-data/security-groups>"
>>>
>>>
>>> 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.
>>>
>>> HTH,
>>> Dave Viner
>>>
>>>
>>> On Tue, Feb 22, 2011 at 8:59 PM, Himanshi Sharma <*
>>> himanshi.sharma@tcs.com* <himanshi.sharma@tcs.com>> 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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>>> --
>>> Sasha Dolgy*
>>> **sasha.dolgy@gmail.com* <sasha.dolgy@gmail.com>
>>>
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>>
>
>
> --
> Frank LoVecchio
> Senior Software Engineer | Isidorey, LLC
> Google Voice +1.720.295.9179
> isidorey.com | facebook.com/franklovecchio | franklovecchio.com
>
>

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