Re: High Availability setup for Stratos

[Alejandro Bonilla <ab...@linuxwireless.org>]

+1. All this can be achieved with Linux-HA, if HA is high demand, one
could even write a resource agent...

On Mon, Apr 7, 2014 at 7:21 PM, Imesh Gunaratne <im...@apache.org> wrote:
> Hi Shaheed,
>
> Thanks for bringing this up. According to my knowledge currently we do not
> have a guide for enabling High Availability for Stratos. I will start
> preparing one so that everyone could contribute.
>
> If we consider the set of products we may use in Stratos:
>
> 1. Stratos Core (Stratos Manager, Autoscaler, Cloud Controller)
> Stratos core products use Carbon registry for managing their state and
> registry could be persisted by a given RDBMS. Therefore we could enable HA
> for Stratos core products by enabling HA for the connected RDBMS and running
> multiple instances of each product in Master-Slave mode using Linux-HA [1].
>
> As I know currently we cannot run Autoscaler in Master-Master mode since the
> auto-scaling decision making process is not designed to run in a distributed
> environment.
>
> 2. Message Broker (ActiveMQ)
> ActiveMQ supports HA in three different ways [2]:
>    a) Shared File System Master Slave
>    b) JDBC Master Slave
>    c) Replicated LevelDB Store
>
> 3. Complex Event Processor (CEP)
> There are two methods for enabling HA in CEP [3]:
>     a) Distributed Cache Mode Deployment
>     b) Persistence Mode Deployment
>
> 4. Business Activity Monitor (BAM)
> There are two methods for enabling HA in BAM [4]:
>     a) Partially Distributed
>     b) Fully Distributed
>
> 5. Stratos Load Balancer
> Stratos load balancer use Synapse for implementing session affinity and
> currently Synapse does not support distributed session management. Therefore
> we could run Stratos load balancer in a distributed environment but without
> having session affinity support.
>
>
> [1] http://www.linux-ha.org/doc/users-guide/users-guide.html
> [2] http://activemq.apache.org/masterslave.html
> [3] https://docs.wso2.org/display/CLUSTER420/Clustering+CEP
> [4]
> https://docs.wso2.org/display/CLUSTER420/Clustering+Business+Activity+Monitor
>
>
> Thanks
> Imesh
>
>
> On Mon, Apr 7, 2014 at 9:43 PM, Shaheedur Haque (shahhaqu)
> <sh...@cisco.com> wrote:
>>
>> Hi all,
>>
>>
>>
>> Separate but related to the thread on “Separating Read-Only files from
>> Read-Write?“ is the question of how to configure High Availability (HA) for
>> Stratos. My assumption is that something like the following steps are
>> needed:
>>
>> 1.       Configure MySQL as a cluster of some kind, or active-active, or
>> active-standby pair
>>
>> 2.       Configure Cassandra as a cluster of some kind, or active-active,
>> or active-standby pair
>>
>> 3.       Configure Stratos (MB, CEP, AS, CC and maybe BAM) to use the
>> above
>>
>>  Is there a configuration guide as to how to do this?
>>
>>  Thanks, Shaheed
>
>
>
>
> --
> Imesh Gunaratne
>
> Technical Lead, WSO2
> Committer & PPMC Member, Apache Stratos