An application definition defines cartridges and dependencies among the
cartridges, and few other stuff such as autoscaling etc. Deployment policy
defines how to deploy an application. Ideally application is defined once,
but it should be able to deploy differently by using different deployment
policy.
Let's consider a use case. A user can define an php-mysql application. Then
it should be able to deploy in single region, or across regions etc by
using different deployment policies.
On 10 Feb 2015 23:46, "Shaheedur Haque (shahhaqu)" <[email protected]>
wrote:
> Hi,
>
>
>
> I am just looking at the new group/application mode, for 4.1, and I
> noticed that the subscribablesInfo no longer contains a deploymentPolicy.
> For example, from [1]:
>
>
>
> “applicationId: “*single_group_v1*”,
>
> …
>
> "subscribableInfo": {
>
> "alias": "tom2group6",
>
> "autoscalingPolicy": "autoscale-policy-1",
>
> "artifactRepository":{
>
> …
>
> }
>
> }
>
> Instead, what seems to have happened is that the deployment policy point
> back to the application, from [2]:
>
>
>
> "applicationId": "*single_group_v1*",
>
> "applicationPolicy": {
>
> "networkPartition": [
>
> This is surely backwards. Why do deployment policies name the
> application? Why can’t a single deployment policy be referenced by multiple
> applications (just like before)?
>
>
>
> Also, what is confusing is that the samples are themselves inconsistent.
> For example, the first one I looked at [3] seems to be missing *any*
> binding between the application .json and the deployment .json; are these
> samples actually supposed to work, or are they perhaps a work in progress
> only?
>
>
>
> Any insights would be most welcome.
>
>
>
> Thanks, Shaheed
>
>
>
> [1]
> https://github.com/apache/stratos/blob/master/samples/applications/single-group-v1/artifacts/application.json
>
> [2]
> https://github.com/apache/stratos/blob/master/samples/applications/single-group-v1/artifacts/openstack/deployment-policy.json
>
> [3]
> https://github.com/apache/stratos/tree/master/samples/applications/single-cartridge/artifacts
>
>
>
>
>
