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From Nirmal Fernando <>
Subject Re: [DISCUSS] Patching exiting cartridge instances with updates
Date Thu, 24 Jul 2014 05:17:29 GMT
On Mon, Jun 30, 2014 at 5:11 PM, Dinesh Bandara <> wrote:

> Hi all,
> I have faced in to a situation that need to update existing cartridge
> instances without interrupt  the process. AFAIU there are two types of
> updates that need to be applied.
>    1. OS level/ Security updates
>    2. Application level updates (Load balancer, PHP, MySQL)
> *Patching OS level/ Security updates*
> Since this is a mandatory update we have to shutdown the server and then
> need to restart it after successfully update the patch. But this will
> interrupt the whole process.
> Cartridge agent related updates can be consider as OS level update.

I don't think we need to. IMO Cartridge agent related updates can be
applied using the same process of marking the state of the member to
maintenance mode (before agent restarts).

> *Solution*
>    - Spawn a new instance and apply the updates.
>    - Terminate exiting instance
>    - Repeat the above steps until spawn new instances on behalf of
>    existing instances
We can't spawn new instances manually. We should let stratos do that. To do
an OS level update etc. we should terminate the instance from the IaaS
level and let Stratos spin a replacement instance (with the new updates).

Preferably, we need a Stratos API to automate the manual process involved

> *Patching Application level updates*
> Status of the cartridge instance set into 'Maintenance' mode, apply
> updates and then set again as an 'Active' instance
> *Expose to user*
> Introduce new rest endpoint via SM which will provide the access to patch
> selected cluster.

Selected member of a cluster rather.

> As the first step I would like to start with the "patching OS level
> updates".
> Highly appreciate your thoughts on this.
> Thanks,
> --
> *Dinesh Bandara*
> Software Engineer
> WSO2 Inc.;
> lean.enterprise.middleware

Best Regards,

Nirmal Fernando.
PPMC Member & Committer of Apache Stratos,
Senior Software Engineer, WSO2 Inc.


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