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Hi again, Nikita.

Also note that I can SSH between instances as well, in addition to
doing so through ip netns on the Openstack controller node. So it must
not be an issue with SSH itself, or with TCP traffic in between
instances.

Thanks for your help.
Jeremy

On Wed, Jul 20, 2016 at 11:32 AM, Nikita Konovalov
<nkonovalov at mirantis.com> wrote:
> Hi, Jeremy.
>
> It looks like there might be a problem in instance to instance
> communication. Could you please check that the tcp traffic between instances
> is not blocked. Especially on port 22.
>
> Could you also send witch version of Sahara do you have and what versions of
> python dependencies are installed in your system.
>
> On Wed, Jul 20, 2016 at 6:20 PM, Jeremy Freudberg <jfreud at bu.edu> wrote:
>>
>> Hi all, I'm having an issue with Sahara accessing its instances. This
>> is over private IP, not public/floating. I have use_floating_ips =
>> false and use_namespaces = true in sahara.conf. My setup also uses
>> Neutron, so use_neutron = true as well.
>>
>> Here is an excerpt from the logs:
>>
>> DEBUG sahara.utils.ssh_remote
>> [req-ad9e16b1-176b-4283-92ea-e2032928e3a0 ] [instance:
>> f2145fd1-fa9e-4d45-9d61-653bb6d6dd6d, cluster:
>> 6493dfa9-4875-4844-abd4-d425b3312ee4] Returning neutron info: {'host':
>> u'192.168.201.23', 'tenant': u'jfreud at bu.edu', 'network':
>> u'433d83c0-1f7f-4fb7-b4a1-995b47344ac4'} get_neutron_info
>> /usr/lib/python2.7/site-packages/sahara/utils/ssh_remote.py:581
>>
>> DEBUG sahara.service.engine [req-ad9e16b1-176b-4283-92ea-e2032928e3a0
>> ] [instance: f2145fd1-fa9e-4d45-9d61-653bb6d6dd6d, cluster:
>> 6493dfa9-4875-4844-abd4-d425b3312ee4] Can't login to node, IP:
>> 192.168.201.23, reason SSHException: Error reading SSH protocol banner
>>
>> We would think this to be a networking issue, right? (Or maybe an SSH
>> issue...) However, when I perform the SSH command manually, I can
>> connect to my instances:
>>
>> ip netns exec qdhcp-433d83c0-1f7f-4fb7-b4a1-995b47344ac4 ssh -i
>> /path/to/private/key ubuntu at 192.168.201.23
>>
>> The above command executes successfully and SSH connects.
>>
>> Any help is greatly appreciated.
>>
>> Thanks,
>> Jeremy Freudberg
>>
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>
>
>
>
> --
> Best Regards,
> Nikita Konovalov
> Mirantis, Inc