Docker
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Containers are not virtual machines - they have fundamentally different architectures and benefits. Docker allows users to build, ship, and run applications inside containers. It provides tools and a platform to manage the lifecycle of containerized applications, from building images to deploying and scaling containers. Containers offer advantages like increased efficiency, flexibility, and portability compared to traditional virtual machines.
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Docker
- 1. Docker 101
- 2. Agenda Containers are NOT VMs Working with Docker (Build, Ship, Run) Container Architecture But Why? Getting started Q & A
- 3. Containers are not VMs
- 4. 4 Docker containers are NOT VMs • Easy connection to make • Fundamentally different architectures • Fundamentally different benefits
- 5. 5 VMs
- 6. 6 Containers
- 7. 7 They’re different, not mutually exclusive
- 8. Build, Ship, and Run
- 10. 10 Some Docker vocabulary Docker Image The basis of a Docker container. Represents a full application Docker Container The standard unit in which the application service resides and executes Docker Engine Creates, ships and runs Docker containers deployable on a physical or virtual, host locally, in a datacenter or cloud service provider Registry Service (Docker Hub or Docker Trusted Registry) Cloud or server based storage and distribution service for your images
- 11. Basic Docker Commands $ docker pull mikegcoleman/catweb:1.0 $ docker images $ docker run –d –p 5000:5000 –-name catweb mikegcoleman/catweb:latest $ docker ps $ docker stop catweb (or <container id>) $ docker rm catweb (or <container id>) $ docker rmi mikegcoleman/catweb:latest (or <image id>) $ docker build –t mikegcoleman/catweb:2.0 . $ docker push mikegcoleman/catweb:2.0
- 12. Dockerfile – Linux Example 12 • Instructions on how to build a Docker image • Looks very similar to “native” commands • Important to optimize your Dockerfile
- 13. 13 Put it all together: Build, Ship, Run Workflow Developers IT Operations BUILD Development Environments SHIP Create & Store Images RUN Deploy, Manage, Scale
- 14. Demo Build, Ship, and Run
- 15. Now you try it! Visit http://docs.docker.com/installation Install the right version of Docker for your machine • Docker for Mac • Docker for Windows After Docker is installed, run Catweb • docker run –d –p 5000:5000 --name catweb mikegcoleman/catweb Browse to port 5000 on your machine • http://localhost:5000
- 17. 17 Image Layers Kernel Alpine Linux Install Python and Pip Upgrade Pip Copy Requirements Install Requirements …
- 18. 18 Docker File System • Logical file system by grouping different file system primitives into branches (directories, file systems, subvolumes, snapshots) • Each branch represents a layer in a Docker image • Allows images to be constructed / deconstructed as needed vs. a huge monolithic image (ala traditional virtual machines) • When a container is started a writeable layer is added to the “top” of the file system
- 19. 19 Copy on Write Super efficient: • Sub second instantiation times for containers • New container can take <1 Mb of space Containers appears to be a copy of the original image But, it is really just a link to the original shared image If someone writes a change to the file system, a copy of the affected file/directory is “copied up”
- 20. 20 What about data persistence? • Volumes allow you to specify a directory in the container that exists outside of the docker file system structure • Can be used to share (and persist) data between containers • Directory persists after the container is deleted • Unless you explicitly delete it • Can be created in a Dockerfile or via CLI
- 22. Enterprises are looking to Docker for critical transformations 80% Docker is central to cloud strategy Docker Survey: State of App development : Q1 - 2016 3 out 4 Top initiatives revolve around applications 44% Looking to adopt DevOps App Modernization DevOpsCloud State of App development Survey: Q1 2016
- 23. 23 Docker delivers speed, flexibility and savings + +Agility Portability Control State of App development Survey: Q1 2016, Cornell University case study 13XMore software releases 62%Report reduction in MTTR 10XCost reduction in maintaining existing applications Eliminate “works on my machine” issues 41%Move workloads across private/public clouds 65%Reduction in developer onboarding time
- 24. One platform delivers one journey for all applications 1 Containerize Legacy Applications Lift and shift for portability and efficiency 2 3 Transform Legacy to Microservices Look for shared services to transform Accelerate New Applications Greenfield innovation
- 25. Docker Universal Control Plane Integrated Security Docker Engine Docker Trusted Registry Config Mgt Monitoring LoggingCI/CD ..more..Images Networking Volumes Virtual Public Cloud Containers in production with Docker Datacenter • Enterprise container orchestration, management and security for dev and ops • Available today for Linux environments • Q4 2016 beta for Windows environments Physical
- 27. 27 Docker on Linux • Create a Linux VM (or use physical), and install Docker −Requires kernel 3.10 • Stable builds −curl –sSL https://get.docker.com/ | sh • Test and experimental builds −curl –sSL https://test.docker.com/ | sh −curl –sSL https://experimental.docker.com/ | sh • Can also manually install (see docs)
- 28. Docker for Windows / Mac • Currently in public beta • Easy to install: Get up and running on Docker in minutes • Leverages Hyper-V (Windows) or xhyv (Mac) − Docker for Windows requires Windows Pro 10, Enterprise, or Education • Full API / CLI compatibility • OS integration for increased stability and speed
- 29. Docker for Azure / AWS • Currently in private beta − https://beta.docker.com/ • Easily deploy Docker 1.12 Swarm clusters (Linux) • Scale up and down easily • Integrate with underlying platform (i.e. load balancers)
- 30. Docker + Windows Server = Windows Containers • Native Windows containers powered by Docker Engine • Windows kernel engineered with new primitives to support containers • Deep integration with 2+ years of engineering collaboration in Docker Engine and Windows Server • Microsoft is top 5 Docker open source project contributor and a Docker maintainer Infrastructure Windows Server 2016 Bins/Libs App Docker Engine Bins/Libs App Bins/Libs App
- 31. Walk, Jog, Run Walk: • Setup your preferred Docker environment • Fire up some prebuilt images (nginx, hello-world, mikegcoleman/catweb) Jog: • Pick a well documented solution (Wordpress, Jenkins, etc) • Build it for yourself (blogs are your friend) Run: • Extend one your Walk solution or Dockerize an existing project • Build your own Dockerfiles • Experiment with Docker Compose and Swarm Mode