On 10/11/2013 11:55 AM, Lakshminaraya Renganarayana wrote:
Clint Byrum <cl...@fewbar.com> wrote on 10/11/2013 12:40:19 PM:
> From: Clint Byrum <cl...@fewbar.com>
> To: openstack-dev <openstack-dev@lists.openstack.org>
> Date: 10/11/2013 12:43 PM
> Subject: Re: [openstack-dev] [Heat] HOT Software orchestration
> proposal for workflows
>
> > 3. Ability to return arbitrary (JSON-compatible) data structure
from config
> > application and use attributes of that structure as an input for other
> > configs
>
> Note that I'd like to see more use cases specified for this ability. The
> random string generator that Steve Baker has put up should handle most
> cases where you just need passwords. Generated key sharing might best
> be deferred to something like Barbican which does a lot more than Heat
> to try and keep your secrets safe.
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.
Is the config data per cluster node unique to each node? If not:
Change deployment to following model:
1. deploy cluster-manager as a resource with a waitcondition - passing
the data using the cfn-signal -d to send the xml blob
2. have cluster nodes wait on wait condition in #1, using data from the
cfn-signal
If so, join the config data sent in cfn-signal and break it apart by the
various cluster nodes in #2
Thanks,
LN
_______________________________________________
OpenStack-dev mailing list
OpenStack-dev@lists.openstack.org
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
_______________________________________________
OpenStack-dev mailing list
OpenStack-dev@lists.openstack.org
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
