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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 <kevin.fox at pnnl.gov> 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.