A Primer to Containerization & Microservices
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This document provides an overview of containerization and microservices. It defines microservices as an architectural style involving independently deployable small services. Containerization is discussed as a way to deploy microservices using lightweight isolated environments. Key benefits of microservices like scalability, flexibility and resilience are covered. Docker is introduced as a popular tool for containerization, allowing packaging and sharing of applications.
A Primer to Containerization & Microservices
- 4. Agenda • Introduction to Microservices • Introduction to Containerization • An Overview of Container Ecosystem • Microservices on Containers
- 6. Monolith Microservices • Composed of a suite of small services. • Each service runs in its own process. • Greater flexibility for scalability. • Put all business capabiliKes into a single applicaKon. • ApplicaKon runs in a single process. • Scales horizontally by running mulKple instances of monolith.
- 8. » Software broken up into functional components. » Componentization via Services in which each service is packaged as one unit of execution. » Independent, autonomous process with no dependency on other Microservices. » Services are organized around business capability. » Decentralization of Data Management. » Independently replaceable and upgradeable. Autonomous Services around Bounded Context
- 9. Communication between Services » Synchronous » REST » Asynchronous » AMQP » RabbitMQ, Apache Kafka, Cloud native Pub/Sub
- 10. Key Benefits » Tackles the problem of complexity. » Flexibility for Polyglot technology stack. » Resilience. » Flexibility for Scalability. » Ease of Deployment. » Organisational Alignment. » Composability. » Optimising for Replaceability.
- 13. Deployment Patterns » Multiple Service Instances per Host » Service Instance per Host » Serverless Deployment » AWS Lambda » Google Cloud Functions
- 16. Container » Lightweight Linux environment. » Hermetically sealed, deployable app. » Separate apps from infrastructure. » Develop app against an idealized OS - A static Linux environment. » Popularized and revolutionized by Docker.
- 17. Why Do Developers Like It? » Reliable deployment » Static application environment; Immutable infrastructure » Portability » Separate applications from where it runs » Repeatable runnable artifact » Run anywhere » Speed and Lightweight » Boots in seconds » 100 -1000 containers on one machine. » Loosely Coupled » Compose apps from autonomous Microservices
- 19. » Open platform for containers. » An ecosystem for build, ship, and run distributed applications. » A lightweight container virtualization platform. » Built on LinuX Containers (LXC) » Written in Go language.
- 21. Docker Fundamentals » Docker Images - Images hold your apps. » Docker Registries - Registry for sharing Docker images via Docker Hub or private registry system. » Docker Containers - Create containers from Docker images to run apps. » Dockerfile - A text document that contains instructions to build a docker image.
- 25. Container Clusters » Docker Swarm » Google Kubernetes » CoreOS Tectonic » Apache Mesos
- 26. Container-Centric Micro OS » CoreOS » Ubuntu Snappy » RancherOS » Red Hat Atomic Host » VMware Photon