I do agree that lack of RabbitMQ multi-tenancy is a problem. However as
this is developers mailing list I would suggest to contribute and make
Murano guest agent secure for the benefit of all users and all existing
applications instead of spending comparable amount of time developing
intricate solutions that will make everything way more complex. If Murano
application developers need to write additional Mistral workflow for each
deployment step that would make application development be extremely harder
and Murano be mostly useless.

There are several approaches that can be taken to solve agent isolation
problem and all of them are relatively easy to implement.
This task is one of out top priorities for the Liberty and will be solved
very soon anyway.

Another approach that IMO also better than SSH is to use HOT software
config that uses HTTP polling and doesn't suffer from lack of tenant

I do want to see better Mistral integration in Murano as well as many other
tools like puppet etc. And there are some good use cases for Mistral. But
when it comes to the most basic things that Murano was designed to do from
the foundation I want to make sure that Murano can do them the best way
possible without requiring users to learn additional DSLs/tools or go extra
step and involve additional services where not necessary. If something
important is missing in Murano that makes usage of Mistral for deployment
more attractive I'd rather focus on improving Murano and bringing those
features to Murano. We can even use Mistral under the hood as long as we
not make users to write both MuranoPL and Mistral DSL code for trivial
things like service restart.

Sincerely yours,
Stan Lagun
Principal Software Engineer @ Mirantis


On Sun, May 10, 2015 at 8:44 PM, Fox, Kevin M <> wrote:

>  Im planning on deploying murano but wont be supporting the murano guest
> agent. The lack of multi tenant security is a big problem I think.
> Thanks,
> Kevin
> ------------------------------
> *From:* Stan Lagun
> *Sent:* Saturday, May 09, 2015 7:21:17 PM
> *To:* OpenStack Development Mailing List (not for usage questions)
> *Subject:* Re: [openstack-dev] [Murano] [Mistral] SSH workflow action
>  Filip,
>  If I got you right the plan is to have Murano application execute
> Mistral workflow that SSH to VM and executes particular command? And
> alternative is Murano->Mistral->Zaquar->Zaquar agent?
> Why can't you just send this command directly from Murano (to Murano agent
> on VM)? This is the most common use case that is found in nearly all Murano
> applications and it is battle-proven. If you need SSH you can contribute
> SSH plugin to Murano (Mistral will require similar plugin anyway). The more
> moving parts you involve the more chances you have for everything to fail
>  Sincerely yours,
> Stan Lagun
> Principal Software Engineer @ Mirantis
>  <>
> On Fri, May 8, 2015 at 11:22 AM, Renat Akhmerov <>
> wrote:
>> Generally yes, std.ssh action works as long as network infrastructure
>> allows access to a host using specified IP, it doesn’t provide anything on
>> top of that.
>> > On 06 May 2015, at 22:26, Fox, Kevin M <> wrote:
>> >
>> > This would also probably be a good use case for Zaqar I think. Have a
>> generic "run shell commands from Zaqar queue" agent, that pulls commands
>> from a Zaqar queue, and executes it.
>> > The vm's don't have to be directly reachable from the network then. You
>> just have to push messages into Zaqar.
>> Yes, in Mistral it would be another action that puts a command into Zaqar
>> queue. This type of action doesn’t exist yet but it can be plugged in
>> easily.
>> > Should Mistral abstract away how to execute the action, leaving it up
>> to Mistral how to get the action to the vm?
>> Like I mentioned previously it should be just a different type of action:
>> “zaqar.something” instead of “std.ssh”. Mistral engine itself works with
>> all actions equally, they are just basically functions that we can plug in
>> and use in Mistral workflow language. From this standpoint Mistral is
>> already abstract enough.
>> > If that's the case, then ssh vs queue/agent is just a Mistral
>> implementation detail?
>> More precisely: implementation detail of Mistral action which may not be
>> even hardcoded part of Mistral, we can rather plug them in (using stevedore
>> underneath).
>> Renat Akhmerov
>> @ Mirantis Inc.
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