![Basic Docker Commands
• docker run <image> - creates a new container based on an image
• docker start <name | ID> - starts an existing container
• docker stop <name | ID> - stops an existing, running container
• docker ps - list all containers [-a include all containers, even stopped
ones]
• docker rm <name | ID> - deletes a container](https://image.slidesharecdn.com/introductiontodockerfinalslides-171026201047/85/Introduction-to-Docker-23-320.jpg)
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Introduction to Docker
- 1. Introduction to Docker What is it? And Why Should I Care? PRESENTATION BY: ALAN FORBES
- 2. Am I in the right place?
- 3. Meet Today’s Presenter Alan Forbes Vice President of Product Management [email protected] Proud IBMAdvanced Business Partners for 18Years
- 4. Agenda - Docker • What it is • How it works • Turbo Demo! • Why you should care
- 5. What is Docker? In jargon, it’s a software container platform It provides abstraction of operating system level virtualization
- 6. What’s in a container? • The operating system • Your software • The dependencies required to run your software (PHP, Mongo, mySQL, Python, Apache, Node, etc.) • Environment variables • Your code • more
- 7. What problem does Docker solve? • It runs on my machine, but not on yours… • Don’t run it on your machine, run it in a container. Then when you share the container, it will work • Specifically, Docker makes it possible to set up local development environments that are exactly like a live server • Also solves the issue of getting more out of existing hardware Buil d Ship Run
- 8. Container vs VM (words) • A virtual machine will include the application, the necessary binaries and libraries, and an entire operating system (many GBs) • A Docker container also contains the application and necessary libraries, but shares the OS kernel with other containers. • Docker containers run in an isolated process space. • Guest OS layer is completely eliminated. • Docker Engine can set on top of Linux, Mac,Windows, Azure, AWS, etc.
- 9. Containers vs Virtual Machine (visual)
- 10. Every container shares the core • With traditionalVMs you can mix and match OS • This is super flexible, but hardware heavy • Resources are allocated at provision time • With Docker, all the containers run on top of same operating system and kernel. • If multiple copies of the same application are what you want, then you'll love containers. • Docker gets the most server application instances running on the least amount of hardware
- 11. Which OS is shared? • Docker can run on Mac,Windows, Linux • The Docker Engine shared OS is a flavor of Linux • In general, Docker containers run Linux (even when running on Windows) • However… onWindows Server 2016 andWindows 10 (Anniversary Edition) only you can runWindows server containers, which allow for .NET, ASP.NET, PowerShell, etc. • Nano server, .NET Core
- 12. Containers can run almost anywhere • Desktop - Mac andWindows • Cloud Providers • IBM Bluemix • AWS • Azure • Servers • CentOS, Debian, Fedora • Oracle Linux, Red Hat, Ubuntu, etc
- 13. But my software isn’t quite done… • Software is never finished • Dependencies change over time • Docker thought of this. It has “git like” versioning to track successive versions of a container, inspect the differences between versions, commit new versions, roll back, etc. • Who made that change and when? • Incremental changes (download just the differences, not a new container) Build Ship Run
- 14. Component Reuse • Any container can be saved as a “base image” from which other containers can be built. • Containers can be built on top of each other (will explain). • The best part is that these containers can be created as part of an automated script.
- 15. Getting started – www.docker.com
- 16. Simple Dockerfile – Image Definition FROM php:7.0-apache COPY src/ /var/www/html/ EXPOSE 80 • Note we don’t have to start from scratch; we’re building on top of an existing image pre-configured with PHP and Apache
- 17. FROM the Public Repository @ Hub.docker.com
- 18. How to use the image
- 19. Containers are stacked • 3 line docker file, starts with FROM • Docker pulled an image from the public repository • That image also contains a From, which may contain another • FROM debian:jessie • FROM scratch
- 20. Add our code: Hello World <?php Echo "hello Social Connections! Today is ". date('l jS of FY h:i:s A'); ?> Run command: docker run -p 80:80 -v /Users/alan/docker/src/:/var/www/html hello- world
- 21. All files copied to the container • A container is an instance of the image • But if a source file changes, you have to stop and rebuild the container (Deploy) • Unless you mount a volume; in this case the files are not part of the container (Dev)
- 22. Life of a container • The container will run until the main process stops • In our case, if PHP crashes • The life of a container is tied to a single process • Thus, try to keep containers to a single main process • Rather than run PHP and my SQL on a single container, run two containers • You can stop them manually with ctrl-c
- 23. Basic Docker Commands • docker run <image> - creates a new container based on an image • docker start <name | ID> - starts an existing container • docker stop <name | ID> - stops an existing, running container • docker ps - list all containers [-a include all containers, even stopped ones] • docker rm <name | ID> - deletes a container
- 24. Quick Review • Installed Docker • Found a suitable image on Docker hub • An image is a text file describing what goes into a container • Created a container using that image PLUS our own code • A container is an instance of an image • Built the container and ran it • Files change – either rebuild the container or “mount” a volume instead • Limit containers to a single process / purpose
- 25. Docker Compose • Each container should provide a single service • An app may need several containers that need to work together • Keeping track of the status of multiple containers can be a pain in a complex application (lots of command line parameters) • Docker Compose allows you to start and stop groups of containers as one unit
- 26. The scenario – 2 related containers • Web page running onApache • Web API running some scripting language (Python, PHP, etc)
- 28. Real life plus a shameless plug
- 29. The scenario – 3 related containers • Apache with PHP plus custom code • mySQL • phpMyAdmin
- 31. Add mySQL
- 33. So why should I care? • At first, I thought to myself “I already know enough technology, how could this thing possibly matter?” • BUT… it does matter: • Docker is a better solution for many problems • It’s pretty easy to learn • IBM is adopting it like crazy, as are many other companies • It’s cool and hip… like you • It’s significantly faster - MongoDB (5 steps or 1?)
- 34. IBM & Docker Together • Docker Subscription for IBM • DockerTrusted Registry: Dedicated image store and distribution service deployed behind your firewall • Docker Engine: Push/pull images, build and run containers • IBM Level 1 and 2 support • Integrated with UrbanCode Deploy for integrated release management
- 35. Docker is a big deal
- 36. Thank you! • Questions? Come visit my booth! • [email protected]
Editor's Notes
- #16: https://www.youtube.com/watch?v=YFl2mCHdv24