Hi, We had an initial team discussion on $subject for WSO2 PPaaS 4.1.0 M1 and this is how we thought we can model a Carbon cluster with Stratos Composite Application Model (CAM):
*How it works:* - There would be a Stratos application defined for each Carbon server. - The startup dependencies would ask Stratos to start individual elements in the application tree in the given order. - Each cartridge would create a separate Stratos cluster (this is different from service cluster) and manage its minimum and maximum number of instances. - Scaling would happen according to Stratos clusters. - Each Stratos cluster would have a dedicated cluster host name and load balancer will be configured to use one cluster hostname for the worker cartridge group and another for the management cartridge group. - Clustering configuration (cluster discovery) will be automated by Stratos Cartridge Agent using an extension/plugin by using Metadata API similar to an approach in [1]. We will send a separate mail on this with details. *Features of This Model:* - WKA member management is handled by CAM - No need to implement logic in Stratos to handle it (in PPaaS 4.0.0 we had to customize Stratos to support this since CAM was not there). - Control the number of Management and Worker nodes needed with corresponding WKA and None WKA nodes using the Application definition. [1] https://coreos.com/docs/cluster-management/setup/cluster-discovery/ Thanks -- *Imesh Gunaratne* Senior Technical Lead WSO2 Inc: http://wso2.com T: +94 11 214 5345 M: +94 77 374 2057 W: http://imesh.gunaratne.org Lean . Enterprise . Middleware
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