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Introduction to Docker - VIT Campus
- The document introduces Docker, explaining that it provides standardized packaging for software and dependencies to isolate applications and share the same operating system kernel. - Key aspects of Docker are discussed, including images which are layered and can be version controlled, containers which start much faster than virtual machines, and Dockerfiles which provide build instructions for images. - The document demonstrates Docker's build, ship, and run workflow through examples of building a simple image and running a container, as well as using Docker Compose to run multi-container applications like WordPress. It also introduces Docker Swarm for clustering multiple Docker hosts.
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Introduction to Docker - VIT Campus
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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. - My PersonalBlog website - Built on WordPress, Hosted on One.com - Recently Completed 4th Year - 175+ blogs on Docker | Kubernetes | Cloud - Monthly close to 1 million visitors per month $curl www.collabnix.com
- 4. - A Shiftfrom Monolithic to Microservices Architecture - Traditional Software Development Workflow(with/without Docker) - What is Docker? What problem does it solve for us? - Docker Vs Linux Containers - Docker Vs Virtual Machine - Running Your First Docker Container - Demo - Using Docker: Build, Ship and Run Workflow - Demo - Building Your Docker Image using Dockerfile - Demo Agenda
- 5. - Introduction toDocker Swarm - How Docker Swarm Mode works? - Running Web Application using Docker Swarm Mode - Demo - Test Drive Docker & Docker Swarm on Raspberry Pi – Let’s make it happen ! - How to contribute towards Docker Community? Agenda
- 6. A Shift fromMonolithic to Microservice Architecture
- 8. Let’s imagine youare building a large, complex application, e.g., Online Store
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- 10. Successful Software Development Architecture ProcessOrganization Small Autonomous team
- 11. Successful Software Development Architecture Process Agile ContinuousDelivery Organization Small Autonomous team
- 12. Successful Software Development Architecture MonolthicVs Microservices Process Agile Continuous Delivery Organization Small Autonomous team
- 13. A Close Lookat Monolithic Browser Client App Storefront UI Module Catalog Module Reviews Module Orders Module HTML REST/JSON Database
- 14. A Close Lookat Monolithic Browser Client App Storefront UI Module Catalog Module Reviews Module Orders Module WAR Tomcat HTML REST/JSON Database
- 15. 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
- 17. - 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
- 18. 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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- 20. - 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
- 21. Once upon atime…a Software Stack
- 22. Now much moredistributed & complex…
- 25. An Effort tosolve the problem Complexity
- 26. Every possible goodto ship X Every Possible way to Ship
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- 28. That’s what Dockeris all about..
- 29. What is Dockerand what problem does it solve?
- 30. 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”
- 31. • 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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- 33. History of Docker A Company as well as Product – 6 Years Old company Developed by DotCloud Inc. ( Currently Docker Inc.) A Framework they built their PaaS upon. Released it as open source 3 and 1/2 years back Cross-platform nature and friendliness towards System Admin and Developers Possible to set up in any OS, be it Windows, OSX, Linux, Solaris - It work the same way Guaranteed to run the same way - Your development desktop, a bare-metal server, virtual machine, data center, or cloud
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- 46. Docker Containers areNOT VMs
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- 50. 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
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- 54. Image Layers Kernel Alpine Linux InstallPython and Pip Upgrade Pip Copy Requirements Install Requirements …
- 55. 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>)
- 56. Using Docker –Build, Ship & Run WorkFlow
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- 58. - Create DockerHubAccount(if not completed) - Open https://play-with-docker.com - Hello Whale Example - Build Your First Docker Image & Push it to DockerHub Demo
- 59. Building Docker Containers& Microservices
- 60. Introducing Dockerfile Series ofinstructions to build Docker Images
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- 62. Each Dockerfile createsa Layer Kernel Alpine Linux Install Python and Pip Upgrade Pip Copy Requirements Install Requirements …
- 63. Compose is atool for defining and running multi-container Docker applications Docker Compose
- 64. - Running WordPressApplication using Docker Compose Demo
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- 66. Let’s start withSingle Docker Host A Docker Host http://collabnix.com/getting-started-with-docker-swarm/
- 67. You start addingmore hosts.. http://collabnix.com/getting-started-with-docker-swarm/
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- 69. Docker Swarm comesfor rescue.. http://collabnix.com/new-docker-1-12-comes-with-built-in-distribution-orchestration-system/
- 70. What is SwarmMode? • A swarm consists of one or more nodes: physical or virtual machines running Docker Engine. • It was introduced first under Docker 1.12 release. • It enables the ability to deploy containers across multiple Docker hosts, using overlay networks for service discovery with a built-in load balancer for scaling the services. http://collabnix.com/docker-1-12-swarm-mode-under-the-hood/
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- 86. Building Swarm Clusteron Raspberry Pi Running Portainer on Raspberry Pi Demo
- 88. How shall Icontribute for Docker Community?
- 90. Reference https://github.com/collabnix/dockerlabs https://docs.docker.com http://www.collabnix.com
- 91.