Hello,

I think that the generic question is - can be O~S services also accessible on 
Neutron networks, so VM (created by Nova) can access it? We (I and Filip) were 
discussing this today and we were not make a final decision. 
Another example is Murano agent running on VMs - it connects to RabbitMQ which 
is also accessed by Murano engine....

  Regards,

        Radek

-----Original Message-----
From: Blaha, Filip 
Sent: Wednesday, May 06, 2015 5:43 PM
To: [email protected]
Subject: [openstack-dev] [Murano] [Mistral] SSH workflow action

Hello

We are considering implementing  actions on services of a murano environment 
via mistral workflows. We are considering whether mistral std.ssh action could 
be used to run some command on an instance. Example of such action in murano 
could be restart action on Mysql DB service. 
Mistral workflow would ssh to that instance running Mysql and run "service 
mysql restart". From my point of view trying to use SSH to access instances 
from mistral workflow is not good idea but I would like to confirm it.

The biggest problem I see there is openstack networking. Mistral service 
running on some openstack node would not be able to access instance via its 
fixed IP (e.g. 10.0.0.5) via SSH. Instance could accessed via ssh from 
namespace of its gateway router e.g. "ip netns exec qrouter-... ssh 
[email protected]" but I think it is not good to rely on implementation detail of 
 neutron and use it. In multinode openstack deployment it could be even more 
complicated.

In other words I am asking whether we can use std.ssh mistral action to access 
instances via ssh on theirs fixed IPs? I think no but I would like to confirm 
it.

Thanks
Filip

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