[sheepdog-users] [sheep-users] Node exit and join the cluster with no log

[Andrew J. Hobbs]

On 08/07/2014 04:09 PM, Valerio Pachera wrote:
I think there has been some problems with the switches for unkown reasons.
What do you think?

Yes, that's indicative of a transient switch issue.  Power perhaps, or a switch restart?  Cable guy accidently jiggling a network cable.  Could be anything.

Then I noticed a second "problem".
Zookeeper.log contains 24.000 entries of

2014-08-07 21:58:01,144 - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn$Factory at 251<http://0.0.0.0/0.0.0.0:2181:NIOServerCnxn$Factory@251>] - Accepted socket connection from /192.168.6.2:47943<http://192.168.6.2:47943>
2014-08-07 21:58:01,144 - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn at 1435<http://0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1435>] - Closed socket connection for client /192.168.6.2:47943<http://192.168.6.2:47943> (no session established for client)
2014-08-07 22:03:01,153 - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn$Factory at 251<http://0.0.0.0/0.0.0.0:2181:NIOServerCnxn$Factory@251>] - Accepted socket connection from /192.168.6.2:48286<http://192.168.6.2:48286>
2014-08-07 22:03:01,153 - INFO  [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn at 1435<http://0.0.0.0/0.0.0.0:2181:NIOServerCnxn@1435>] - Closed socket connection for client /192.168.6.2:48286<http://192.168.6.2:48286> (no session established for client)

Why is it trying to connect to this host (192.168.6.2)?
This host is nor zookeepr neither sheepdog node.

I checked all /etc/zookeeper/conf/zoo.cfg and there's not 192.168.6.2 anywhere!

Thank you.
This is more interesting.  This wasn't zookeeper connecting to 192.168.6.2, this was the reverse, 192.168.6.2 connecting to the zookeeper node.  Looks like a network scan for open connections.

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