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From Reka Thirunavukkarasu <r...@wso2.com>
Subject Re: Stratos and Kuburnetes and docker support.
Date Tue, 16 Sep 2014 06:00:58 GMT
Hi

On Mon, Sep 15, 2014 at 3:23 PM, Rajkumar Rajaratnam <rajkumarr@wso2.com>
wrote:

> Hi,
>
> I am working on monitoring docker container clusters. It will perform
> min/max check per service cluster and scale up/down containers periodically
> based on the autoscale policy, instance health and requests in flight.
>
> I figured out the implementations/changes to be done in order to support
> docker cluster monitoring.
>
> An initial version of docker cluster monitor (4.1.0 M1) is already merged
> into the docker-integration branch.
>
> I will summarize the implementations and changes to be done below.
>
> *Changes to Cluster Monitor Design*
>
> With docker integration, we need to plug in a new docker cluster monitor.
> At the moment, we are having the following cluster monitor hierarchy.
>
>
> ​
>
> We are not able to plug in a new cluster monitor (say container cluster)
> to this design. Because, AbstractMonitor is not abstract enough, as it is
> based on network partitions. Hence, I propose we should introduce another
> level of abstraction so that we will be able to plug in any 'entity'
> cluster monitors. Here is the new structure,
>
>
> ​
> WDYT?​
>

+1 for the approach. But can you let me know how are you going to load the
relevant monitors based on the request? Are you going to use factory
pattern here? Since i'm also working on monitoring support for grouping,
would like to know how i can integrate this.

>
> Next thing is the auto scaling.
>
> *Changes to Cartridge Agent*
>
> Currently Cartridge Agent is publishing data to CEP via a single stream
> (cartridge_agent_health_stats). To support docker scenario, we have two
> options,
>
>    1. We can introduce an additional parameter to the same stream
>    (cartridge_agent_health_stats) to identify which type of cluster a
>    cartridge instance is coming from (VM based or Container based)
>    Drawbacks - We will be always sending some unwanted properties like
>    network_partition_id and partition_id
>                     - It will increase overhead in processing events in
>    CEP.
>    2. We can introduce a separate stream for container (docker) scenario.
>
> WDYT?
>
> *Changes to CEP extension*
>
> Currently CEP is firing events against network partitions. In docker
> scenario, it should fire the same events but against clusters. We should
> introduce new execution plans for docker scenario, which will process the
> data against clusters and fire to the same events.
>
> *Changes to Health Stats Events*
>
> We may need to add an additional attribute, say typeOfCluster, to health
> stats events. Then, on receiving events, we would easily identify which
> type of cluster the cartridge instance is coming from, and we can retrieve
> the attributes we are interested in. Also it makes easier to get the
> cluster monitor directly (currently we are searching for cluster monitors
> in each cluster monitors' list using cluster id)
>
> *Changes to rules (drools)*
>
> We will be having new rules in drools for docker scenario (it will be
> purely based on autoscaling policy, there are no partition/deployment
> policies)
>
> Please share your thoughts on this, as these will be implemented in 4.1.0
> M2.
>
> Thanks.
>
> --
> Rajkumar Rajaratnam
> Software Engineer | WSO2, Inc.
> Mobile +94777568639 | +94783498120
>
> On Fri, Sep 12, 2014 at 9:49 PM, Akila Ravihansa Perera <
> ravihansa@wso2.com> wrote:
>
>> Hi,
>>
>> I've started working on implementing registering Kubernetes endpoint.
>> I've shared the Kubernetes information model and sequence diagram for
>> registering a Kubernetes endpoint (images attached). Also this can
>> viewed on draw.io at [1,2]. We can represent a Kubernetes cluster
>> (master and slaves) by KubernetesGroup class which will contain
>> KubernetesHost list and KubernetesMaster attributes.
>>
>> The following REST API endpoints will be exposed to
>> register/update/remove Kubernetes clusters. Note that it will
>> dynamically register Kubernetes endpoint and persist them in
>> auto-scaler registry. Autoscaler will keep an in-memory information
>> model of registered Kubernetes clusters and provide web services to
>> query and retrieve Kubernetes hosts information.
>>
>> POST /kubernetes/deploy/group  - Creates a KubernetesGroup object
>> PUT /kubernetes/deploy/host/{kubernetesGroupId}  - Creates a
>> KubernetesHost object under the KubernetesGroup object identified by
>> kubernetesGroupId
>> PUT /kubernetes/update/master  - Updates a KubernetesMaster object
>> GET /kubernetes/group  - Retrieves a list of KubernetesGroup objects
>> GET /kubernetes/group/{kubernetesGroupId}  - Retrieves the
>> KubernetesGroup object identified by kubernetesGroupId
>> GET  /kubernetes/{kubernetesHostId} - Retrieves the KubernetesHost
>> object  identified by kubernetesHostId
>> DELETE /kubernetes/group/{kubernetesGroupId} - Removes  the
>> KubernetesGroup object identified by kubernetesGroupId
>> DELETE /kubernetes/group/{kubernetesHostId}  - Removes the
>> KubernetesHost object identified by kubernetesHostId
>>
>> [1] https://www.draw.io/#G0B4VuDZ50W69_SFozbS1vRVpyOEk
>>
>> [2] https://www.draw.io/#G0B4VuDZ50W69_d0NPSmFBM2ZsVWs
>>
>> This is a draft design and might require further improvements. Would
>> appreciate your thoughts.
>>
>> Thanks.
>> --
>> Akila Ravihansa Perera
>> Software Engineer, WSO2
>>
>> Blog: http://ravihansa3000.blogspot.com
>>
>
>
>
> --
> Rajkumar Rajaratnam
> Software Engineer | WSO2, Inc.
> Mobile +94777568639 | +94783498120
>



-- 
Reka Thirunavukkarasu
Senior Software Engineer,
WSO2, Inc.:http://wso2.com,
Mobile: +94776442007

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