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Introduction Into Docker Ecosystem
This document contains the slides from a presentation given by Oleksandr Pastukhov in August 2016 at JUG Shenzhen. The presentation introduces Docker, including what it is for developers and administrators, the differences between containers and VMs, Docker basics, and how Docker can be used to deploy applications across different environments like development, testing, production and more. Various Docker commands are also listed and explained.
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Introduction Into Docker Ecosystem
- 1. Oleksandr Pastukhov JUG ShenzhenAugust 2016
- 2. Senior Softwaredeveloper in EPAM SZ Father and Husband. StartUp ideas generator. Could sell any by 1$
- 3. Docker asa Solution For Developer For Administrator Container vs VM Docker Basics Kitematic Docker in Numbers Orchestration Bonus
- 5. Static website Web frontend Backgroundworkers User DB Analytics DB Queue Developmen t VM QA Server Single Prod Server Onsite Cluster Public Cloud Contributor’ s laptop Customer Servers ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
- 6. ? ? ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
- 7.
- 8. Multiplicityof Goods Multiplicityof methodsfor transporting/sto ring DoIworryabout howgoods interact(e.g. coffeebeans nexttospices) CanItransport quicklyand smoothly (e.g.fromboat totraintotruck) …in between, canbe loaded and unloaded, stacked, transported efficiently over long distances, and transferred from one mode of transport to another A standard container that is loaded with virtually any goods, and stays sealed until it reaches final delivery.
- 9. Static website WebfrontendUser DB Queue Analytics DB Development VM QA server Public Cloud Contributor’s laptop Multiplicityof Stacks Multiplicityof hardware environments Production Cluster Customer Data Center Doservices andapps interact appropriately? CanImigrate smoothlyand quickly …that can be manipulated using standard operations and run consistently on virtually any hardware platform An engine that enables any payload to be encapsulated as a lightweight, portable, self-sufficient container…
- 10. Static website Web frontend Backgroundworkers User DB Analytics DB Queue Developmen t VM QA Server Single Prod Server Onsite Cluster Public Cloud Contributor’ s laptop Customer Servers ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
- 11. Static website Web frontend Backgroundworkers User DB Analytics DB Queue Developmen t VM QA Server Single Prod Server Onsite Cluster Public Cloud Contributor’ s laptop Customer Servers
- 12. Build once…(finally)run anywhere ◦ A clean, safe, hygienic and portable runtime environment for your app. ◦ No worries about missing dependencies, packages and other pain points during subsequent deployments. ◦ Run each app in its own isolated container, so you can run various versions of libraries and other dependencies for each app without worrying ◦ Automate testing, integration, packaging…anything you can script ◦ Reduce/eliminate concerns about compatibility on different platforms, either your own or your customers. ◦ Cheap, zero-penalty containers to deploy services? A VM without the overhead of a VM? Instant replay and reset of image snapshots? That’s the power of Docker
- 13. Configure once...run anything Make the entire lifecycle more efficient, consistent, and repeatable Increase the quality of code produced by developers. Eliminate inconsistencies between development, test, production, and customer environments. Support segregation of duties. Significantly improves the speed and reliability of continuous deployment and continuous integration systems. Because the containers are so lightweight, address significant performance, costs, deployment, and portability issues normally associated with VMs.
- 15. App A Containers vs. VMs Hypervisor(Type 2) Host OS Server Guest OS Bins/ Libs App A’ Gue st OS Bins/ Libs App B Gue st OS Bins/ Libs AppA’ Docker Host OS Server Bins/Libs AppA Bins/Libs AppB AppB’ AppB’ AppB’ VM Container Containers are isolated, but share OS and, where appropriate, bins/libraries Guest OS Guest OS …result is significantly faster deployment, much less overhead, easier migration, faster restart
- 16. Why are Dockercontainers lightweight? Bins/ Libs App A Original App (No OS to take up space, resources, or require restart) AppΔ Bins / App A Bins/ Libs App A’ Gue st OS Bins/ Libs Modified App Copy on write capabilities allow us to only save the diffs Between container A and container A’ VMs Every app, every copy of an app, and every slight modification of the app requires a new virtual server App A Guest OS Bins/ Libs Copy of App No OS. Can Share bins/libs App A Guest OS Guest OS VMs Containers
- 17. What are thebasics of the Docker system? Source Code Repository Dockerfile For A Docker Engine Docker Container Image Registry Build Docker Host 2 OS (Linux) ContainerA ContainerB ContainerC ContainerA Push Search Pull Run Host 1 OS (Linux)
- 18. Changes and Updates DockerEngine Docker Container Image Registry Docker Engine Push Update Bins/ Libs App A AppΔ Bin s/ Base Container Image Host is now running A’’ Container Mod A’’ AppΔ Bin s/ Bins/ Libs App A Bin s/ Bins/ Libs App A’’ Host running A wants to upgrade to A’’. Requests update. Gets only diffs Container Mod A’
- 24. docker info -basic info about docker machine docker stats - live stream containers statistics docker images - list images docker ps - running containers docker events - logs from docker machine docker stop <containerid> - start container docker start <containerid> kill | pause | unpause | restart
- 25. docker rm <containerid> dockerrmi <imageid> docker port <containerid> - mapped ports docker inspect <containerid> - container info docker top <containerid> - processes docker exec <containerid> command -in the running container docker run <containerid> command -in the new container docker logs <containerid> - last logs docker attach <containerid> - to see container logs realtime
- 26. docker build <dockerfile> dockersearch - in the hub for images docker create <imgname>- new container from image docker export –o <filename> <containerid> – fs to tar docker import - fs from tar docker load <image >- image from tar docker save <image> - images to tar docker rename - container
- 27. Registry docker login -to docker registry docker logout docker commit - Create image from container docker diff - changes uncommitted docker history - of changes docker pull / push – image docker cp - copy between containers
- 28. docker network connect disconnect inspect ls rm create volume -manage volumes create inspect ls rm
- 41. 1. Docker underRaspberry Pi 2. Set up a game server
- 43.