Parallelism in a multi-level workflow

This is going to be a very specific use case so some background first.
We have an orchestrator environment set up with 1 management server and 4 runbook servers. The management server and 2 of the runbook servers live inside the main domain, the other two live out in the DMZ for use with managing our web servers. The runbook servers
inside the secure domain are set up with the web service for outside management. This is our new environment, out old environment is 1 management server/runbook server (combined) in the secure domain running the web service and 1 runbook server in the DMZ.
The old system has a firewall hole allowing the DMZ to talk to the web service inside the domain (this is obviously wrong and a security threat).
One of our work flows requires the use of some asynchronous running of runbooks, and the old system we used the web service to allow that to happen. We have used the web service in the same way in ~20 different runbooks, therefore this is a very useful way
of achieving what we want given the limits imposed upon us by the software.
Example:
This runbook would be running from the DMZ, but starting the runbooks over http web service inside the secure domain. The new environment this hole is closed, I can't make http requests back into the secure domain. Lastly the web service allows us to know when
all child runbooks have completed, and we need to know this so we don't carry on while something else is processing.
So why aren't we using invoke runbook and counters? Inherently counters are volatile as they are global. If we wanted to start a runbook containing counters more than once at a time (which we will need to do) we will end up with broken runbooks with spurious
values in the counters.
We've tried wrapping the web service activities inside another runbook and forced those runbooks to only run on the internal runbook servers, which works but we loose the ability to then know when all the children have finished which means we carry on before
we know its safe too, due to having to use our runbook.
We need a secure solution to allow runbooks to be ran asynchronously without the use of invoke runbook/counters. Systems wont let us poke a hole through the firewall again back into the secure domain.
Ideally the best solution would be if orchestrator supported true asynchronous runbooks. Being able to start multiple children and wait for their completion before carrying on would solve the entire issue, but I can't see this happening at all.

Hi,
if I understand right the Runbook Servers in DMZ use the same Orchestrator Database as Management Server and Runbook Servers in "secure domain". So, the SQL-Port to the database instance with the Orchestrator is open.
Create a separate interface DB at this database instance and a table in this with a IDENTITY-field ans Status and perhaps other information. Before using "Invoke Runbook" at the Runbook Servers create an entry in that table and pass the ID
to the Runbook running in DMZ. Let the Runbook in DMZ update this row than you know in your parent Runbook the status of the Runbook running in DMZ.
Regards,
Stefan
www.sc-orchestrator.eu ,
Blog sc-orchestrator.eu

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