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<div class="moz-cite-prefix">On 10/11/2013 11:55 AM, Lakshminaraya
Renganarayana wrote:<br>
</div>
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<p><tt><font size="2">Clint Byrum <a class="moz-txt-link-rfc2396E" href="mailto:clint@fewbar.com"><clint@fewbar.com></a> wrote
on 10/11/2013 12:40:19 PM:<br>
<br>
> From: Clint Byrum <a class="moz-txt-link-rfc2396E" href="mailto:clint@fewbar.com"><clint@fewbar.com></a></font></tt><br>
<tt><font size="2">> To: openstack-dev
<a class="moz-txt-link-rfc2396E" href="mailto:openstack-dev@lists.openstack.org"><openstack-dev@lists.openstack.org></a></font></tt><br>
<tt><font size="2">> Date: 10/11/2013 12:43 PM</font></tt><br>
<tt><font size="2">> Subject: Re: [openstack-dev] [Heat] HOT
Software orchestration <br>
> proposal for workflows</font></tt><br>
<tt><font size="2">> <br>
> > 3. Ability to return arbitrary (JSON-compatible)
data structure from config<br>
> > application and use attributes of that structure
as an input for other<br>
> > configs<br>
> <br>
> Note that I'd like to see more use cases specified for
this ability. The<br>
> random string generator that Steve Baker has put up
should handle most<br>
> cases where you just need passwords. Generated key
sharing might best<br>
> be deferred to something like Barbican which does a lot
more than Heat<br>
> to try and keep your secrets safe.<br>
</font></tt><br>
<tt><font size="2">I had seen a deployment scenario that needed
more than random string generator. It was during the
deployment of a system that has clustered application
servers, i.e., a cluster of application server nodes + a
cluster manager node. The deployment progresses by all the
VMs (cluster-manager and cluster-nodes) starting
concurrently. Then the cluster-nodes wait for the
cluster-manager to send them data (xml) to configure
themselves. The cluster-manager after reading its own config
file, generates config-data for each cluster-node and sends
it to them. </font></tt><br>
<br>
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Is the config data per cluster node unique to each node? If not:<br>
<br>
Change deployment to following model:<br>
1. deploy cluster-manager as a resource with a waitcondition -
passing the data using the cfn-signal -d to send the xml blob<br>
2. have cluster nodes wait on wait condition in #1, using data from
the cfn-signal<br>
<br>
If so, join the config data sent in cfn-signal and break it apart by
the various cluster nodes in #2<br>
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<tt><font size="2">Thanks,</font></tt><br>
<tt><font size="2">LN</font></tt><br>
<br>
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