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<div class="moz-cite-prefix">Hi Stan<br>
<br>
we wanted interact with murano applications from mistral.
Currently there is no support in mistral how to execute scripts on
VM via murano agent (maybe I miss something). We noticed std.ssh
mistral action so we consider SSH as one of the options. I think
that it is not good idea due to networking obstacles I just wanted
to confirm that. Thanks for pointing out Zaquar I didn't know
about it.<br>
<br>
Filip<br>
<br>
<br>
On 05/10/2015 04:21 AM, Stan Lagun wrote:<br>
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<div dir="ltr">Filip,
<div><br>
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<div>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?</div>
<div>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 </div>
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<div dir="ltr"><span
style="border-collapse:separate;color:rgb(0,0,0);font-family:'Times
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style="font-family:arial;font-size:small">Sincerely
yours,<br>
Stan Lagun<br>
Principal Software Engineer @ Mirantis</span></span><br>
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<div class="gmail_quote">On Fri, May 8, 2015 at 11:22 AM, Renat
Akhmerov <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:rakhmerov@mirantis.com" target="_blank">rakhmerov@mirantis.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">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.<br>
<span class=""><br>
<br>
> On 06 May 2015, at 22:26, Fox, Kevin M <<a
moz-do-not-send="true" href="mailto:kevin.fox@pnnl.gov">kevin.fox@pnnl.gov</a>>
wrote:<br>
><br>
> 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.<br>
> The vm's don't have to be directly reachable from the
network then. You just have to push messages into Zaqar.<br>
<br>
</span>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.<br>
<span class=""><br>
> Should Mistral abstract away how to execute the
action, leaving it up to Mistral how to get the action to
the vm?<br>
<br>
</span>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.<br>
<span class=""><br>
> If that's the case, then ssh vs queue/agent is just a
Mistral implementation detail?<br>
<br>
</span>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).<br>
<span class="HOEnZb"><font color="#888888"><br>
<br>
Renat Akhmerov<br>
@ Mirantis Inc.<br>
</font></span>
<div class="HOEnZb">
<div class="h5"><br>
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