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Hi,

>From Murano experience I can tell you that ssh to VM in general case will
not work. In order to have an ssh access you will have to assign floating
IPs so that Mistral service will be able to connect to VM.
That is exactly the reason why Murano uses agent and MQ mechanism when
client on VM initiates a connection. I believe the same issue was in Sahara
when they used direct ssh connections to VMs.

Thanks
Gosha


On Wed, May 6, 2015 at 9:00 AM, Pospisil, Radek <radek.pospisil at hp.com>
wrote:

> 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: openstack-dev at lists.openstack.org
> 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
> cirros at 10.0.0.5" 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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-- 
Georgy Okrokvertskhov
Architect,
OpenStack Platform Products,
Mirantis
http://www.mirantis.com
Tel. +1 650 963 9828
Mob. +1 650 996 3284
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