Cloud-Native Applications with Microservices and Containers

Editor's Notes

• #5: Coupling and cohesion are terms which occur together very frequently. Coupling refers to the interdependencies between modules, while cohesion describes how related are the functions within a single module. Low cohesion implies that a given module performs tasks which are not very related to each other and hence can create problems as the module becomes large.  A component exhibits high cohesion when all its functions/methods are strongly related in terms of function https://en.wikipedia.org/wiki/Cohesion_(computer_science) Two components are loosely coupled, when changes in one never or rarely necessitate a change in the other https://en.wikipedia.org/wiki/Coupling_(computer_programming) “Low coupling often correlates with high cohesion, and vice versa. Low coupling is often a sign of a well-structured computer system and a good design, and when combined with high cohesion, supports the general goals of high readability and maintainability.”
• #7: Auto Scaler Auto scaler provides primarily auto recovery of desired group size for each service Must be AZ/Pod aware Integrated with Service Endpoint service Edge Routing External traffic always enters the edge route tier Handles A/B routing, canary testing, and version routing Handles rate limiting, throttling, and filtering Does NOT route intra-service traffic Service Tier Microservices implemented inside Docker containers Connected to the auto scaler Service Endpoints Service Endpoint service provides location, health, and status of all service instances to router Provides control of version selection Updated by auto scaler and services Service Ops Console Provides management control for the application & components Deployment Version control, update, etc. Mid-Tier Routing Handles all internal routing Provides same controls as edge router Image Build & Repository Automation of the build pipeline Supports automated deploy and update Integrates with container service & repository Container Service Runtime hosting of a collection of containers on shared infrastructure Implements resource isolation controls
• #10: Amalgam8 is an open-source platform that simplifies integration of polyglot microservices. Inspired by AirBnB’s Smartstack, Amalgam8 decouples service registration, discovery and client-side load balancing from your application logic. It provides a centralized command center to configure routing of requests across an entire set of microservices, transform in-flight requests, and more.
• #11: Amalgam8 simplifies microservice integration tasks and enables you to focus on the DevOps functions such as canary testing, A/B testing, red/black deployments, systematic resilience testing, etc. You can use the Amalgam8 platform with popular container runtimes like Kubernetes, Marathon/Mesos, VMs, or your favorite PaaS environment such as IBM Bluemix, Google Cloud, Azure, etc