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https://issues.apache.org/jira/browse/STRATOS-1234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14357901#comment-14357901
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Imesh Gunaratne commented on STRATOS-1234:
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Hi Sandaruwan,
Thanks for updating the Google document. Now it looks good. Please note that
still I cannot see any details on the approach we are going to take on applying
an update for a cluster in an application. Also it would be great if you can
provide rights to comment on the document.
For an example there could be an application A1, using two cartridges C1 & C2.
User might need to apply an update to C1. Once the application A1 is deployed
it will create two clusters, one for C1 and another for C2. Now we need to have
a process to execute this. Will you be able to design a workflow for this? This
is the core functionality of this project. Once we are done with this we can
properly design the API.
Regarding setting up a Stratos development environment, Amazon EC2 would be
fine but it would cost you a lot. I would like to recommend to use OpenStack
for Puppet based scenarios and Kubernetes for Docker. Initially to get an idea
on how Stratos works, please try Kubernetes [1]. If you can find a set of
physical servers you should be able to install OpenStack in them (will do this
as the second step).
[1] https://gist.github.com/imesh/b8f81fac8de39183a504
Thanks
Imesh
> Software Update Management Solution for Stratos
> ------------------------------------------------
>
> Key: STRATOS-1234
> URL: https://issues.apache.org/jira/browse/STRATOS-1234
> Project: Stratos
> Issue Type: New Feature
> Reporter: Imesh Gunaratne
> Labels: gsoc2015, mentor
>
> Stratos uses Virtual Machines and Containers for hosting platform services on
> different Infrastructure as a Service (IaaS) solutions. At present Puppet is
> used for orchestration management on Virtual Machine based systems and
> manages all required software in Puppet Master. Container based systems
> creates Docker images for each platform service by including required
> software in the Docker image itself.
> In Virtual Machine use-case VM instances will communicate with Puppet master
> and execute the software installation. The same approach can be used for
> applying software updates.
> In Docker use-case we do not use Puppet because a new container with required
> software can be started in few seconds. This is very efficient compared to
> using Puppet and installing software on demand.
> The requirement of this project is to implement a core Stratos feature to
> propagate software updates in a live PaaS environment.
> 1. Puppet based solution:
> - Push software updates of a cartridge to Puppet Master (might not need to
> automate).
> - Invoke the software update process via the Stratos API for a given
> application.
> - Stratos Manager could send a new event to trigger puppet agent in each
> instance to apply the updates.
> 2. Docker based solution
> - Create a new docker image (with a new image id) for the cartridge with
> software updates (might not need to automate).
> - Invoke the software update process via the Stratos API for a given
> application.
> - Autoscaler can implement a new feature to bring down existing instances and
> create new instances with the new docker image id.
> Important!
> - In each scenario if updates are backward compatible, software update
> process should execute in phases, it should not bring down the entire cluster
> to apply the updates. If so the service will be unavailable for a certain
> time period. The idea is to apply the updates to set of members at a time.
> - If the updates are not backward compatible, we could make the entire
> cluster unavailable at once and apply the updates.
> - Member's state needs to be changed to a new state called "Updating" when
> applying the updates.
> If there is an interest on doing this project please send a mail to imesh at
> apache dot org by copying Apache Dev mailing list [1]. Please refer Stratos
> Wiki [2] for more information on Stratos architecture and how it works.
> [1] http://stratos.apache.org/community/mailing-lists.html
> [2] https://cwiki.apache.org/confluence/display/STRATOS
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