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Demystifying Docker
This document provides an overview of Docker and how it addresses challenges with traditional monolithic application architectures. It begins with introductions to Docker and microservices architecture. Key points include: - Docker allows building applications from loosely coupled microservices that can be developed and scaled independently. - Docker containers leverage resource isolation using process virtualization for improved efficiency over virtual machines. - The Docker architecture includes images constructed from layered filesystem changes and containers running instances of images. - Docker Compose and Dockerfiles help define and build multi-container applications and microservices.
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Demystifying Docker
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- 2. $whoami Principal Development Engineerat DellEMC 1st half of my career was in CGI & VMware 2nd half of my career has been in System Integration Testing Docker Captain (since 2016) Docker Bangalore Meetup Organizer ( 7600+ Registered Users) DockerLabs Incubator Ajeet Singh Raina Twitter: @ajeetsraina GitHub: ajeetraina
- 3. Ajeet Singh Raina @ajeetsraina Tip ofthe Captains Hat Award
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- 5. A Shift fromMonolithic to Microservice Architecture
- 7. Let’s imagine youare building a large, complex application, e.g., Online Store
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- 9. Successful Software Development Architecture ProcessOrganization Small Autonomous team
- 10. Successful Software Development Architecture Process Agile ContinuousDelivery Organization Small Autonomous team
- 11. Successful Software Development Architecture MonolthicVs Microservices Process Agile Continuous Delivery Organization Small Autonomous team
- 12. A Close Lookat Monolithic Browser Client App Storefront UI Module Catalog Module Reviews Module Orders Module HTML REST/JSON Database
- 13. A Close Lookat Monolithic Browser Client App Storefront UI Module Catalog Module Reviews Module Orders Module WAR Tomcat HTML REST/JSON Database
- 14. Simple to Develop,Test, Deploy & Scale - Simple to develop because of all the tools and IDEs support to that kind of application by default. - Easy to deploy because all components are packed into one bundle. - Easy to scale the whole application. Benefits of Monolith
- 16. - Very difficultto maintain - One component failure will cause the whole system to fail. - Very difficult to understand and create the patches for monolithic applications. - Adapting to new technology is very challengeable. - Take a long time to startup because all the components need to get started. Disadvantages of Monolith
- 17. Today - Apps areconstantly developed - Built from loosely coupled components - Newer version are deployed often - Deployed to a multitude of servers Customer/ Clients/ Users Data Storage Data Storage Data Storage
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- 19. - Can scaleindependent microservices separately. No need to scale the whole the system - Can use the latest technologies to develop the microservices. - One component failure will not cause entire system downtimes. - When developing an overall solution we can parallel the microservices development task with the small teams. So it helps to decrease the development time. Benefits of Microservices
- 20. Once upon atime…a Software Stack
- 21. Now much moredistributed & complex…
- 24. An Effort tosolve the problem Complexity
- 25. Every possible goodto ship X Every Possible way to Ship
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- 27. That’s what Dockeris all about..
- 28. What is Dockerand what problem does it solve?
- 29. What is Docker? Refersto several things in 2019 Docker as a “Company” Docker as a “Product” Docker as a “Platform” Docker as a “CLI Tool” Docker as a “Computer Program”
- 30. • Standardized packagingfor software and dependencies • Isolate apps from each other • Share the same OS kernel • Works for all major Linux distributions • Containers native to Windows Server 2016 & 1809 What is Docker?
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- 45. Docker Containers areNOT VMs
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- 49. Comparing Docker &VM Virtual Machines Docker Each VM runs its own OS Container is just a user space of OS Boot up time is in minutes Containers instantiate in seconds VMs snapshots are used sparingly Images are built incrementally on top of another like layers. Lots of images/snapshots Not effective diffs. Not version controlled Images can be diffed and can be version controlled. Docker hub is like GITHUB Cannot run more than couple of VMs on an average laptop Can run many Docker containers in a laptop. Only one VM can be started from one set of VMX and VMDK files Multiple Docker containers can be started from one Docker image
- 50. What makes Containers sosmall?
- 51. User space refersto all of the code in an operating system that lives outside of the kernel. Container = User Space of OS Process Virtualization
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- 60. Image Layers Kernel Alpine Linux InstallPython and Pip Upgrade Pip Copy Requirements Install Requirements …
- 61. A Look at“Dive” Tool A tool for exploring each layer in a Docker image https://github.com/wagoodman/dive
- 62. Basic Docker CLIs PullingDocker Image $ docker pull ajeetraina/hellowhale Listing out Docker Images $ docker image ls Running Docker Containers $ docker run –d –p 5000:5000 –-name hellowhale ajeetraina/hellowhale Stopping the container $ docker stop hellowhale (or <container id>)
- 63. Docker Desktop Community VsDocker Enterprise
- 64. Docker Community Edition Allin one development for Swarm and Kubernetes
- 65. Docker Desktop CommunityVs Enterprise Docker Desktop Community Docker Desktop Enterprise Simplest Path to Container-based Development Latest Docker Engine Based on Containerd Certified Kubernetes Available for Windows 10 & MacOS Develop in any Language & Framework, even multiple versions simultaneously
- 66. Docker Desktop CommunityVs Enterprise Docker Desktop Community Docker Desktop Enterprise Production-Ready Environment Same API & Commands shared by Developers in Production Application Designer interface to simplify creating & developing Docker applications Swappable Docker Engine and Kubernetes versions to match Docker Enterprise production environments
- 67. Using Docker –Build, Ship & Run WorkFlow
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- 69. - Create DockerHubAccount(if not completed) - Open https://play-with-docker.com - Hello Whale Example - Build Your First Docker Image & Push it to DockerHub Demo
- 70. Docker New CLIPlugin
- 71. Plugins Delivery VehicleAvailability app 19.03-ce, 19.03-ee, Desktop CE, Desktop EE Available now via Engine Community and Desktop Community (Mac | Windows) Docker Enterprise 3.0 assemble 19.03-ee, Desktop Enterprise Available with Docker Enterprise 3.0 template 19.03-ee, Desktop Enterprise Available with Docker Enterprise 3.0 cluster 19.03-ee, Desktop Enterprise Available with Docker Enterprise 3.0 gmsa 19.03-ee, Desktop Enterprise Available with Docker Enterprise 3.0 registry 19.03-ee, Desktop Enterprise Available with Docker Enterprise 3.0 buildx desktop-edge Available in Desktop CE Edge (Mac | Windows), download the plugin jump Sign up for more information Sign up for more information pipeline Sign up for more information Sign up for more information Docker New CLI Plugin
- 72. Building Docker Containers& Microservices
- 73. Introducing Dockerfile Series ofinstructions to build Docker Images
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- 75. Each Dockerfile createsa Layer Kernel Alpine Linux Install Python and Pip Upgrade Pip Copy Requirements Install Requirements …
- 76. Compose is atool for defining and running multi-container Docker applications Docker Compose
- 77. - Running WordPressApplication using Docker Compose Demo
- 78. How can Icontribute?
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- 81. Reference https://github.com/collabnix/dockerlabs https://docs.docker.com http://www.collabnix.com
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