JOSA TechTalk: Introduction to docker
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The document provides an introduction to Docker, emphasizing its relevance for developers and system administrators by offering a clean and portable runtime environment through the use of containers. It compares Docker to traditional VMs, highlighting the lightweight nature and efficiency improvements it brings to the software development lifecycle. Additionally, it outlines practical usage through Docker commands and Docker Compose for managing multi-container applications.
JOSA TechTalk: Introduction to docker
- 1. Intro to Docker Aram Yegenian - Systems Admin
- 2. ● Who should care? ● What is the problem? ● What is a container? ● What is Docker ● Docker 101 ● Docker demo ● Docker compose ● Docker compose demo Outline
- 3. ● Who should care? ● What is the problem? ● What is a container? ● What is Docker ● Docker 101 ● Docker demo ● Docker compose ● Docker compose demo Outline
- 4. Why developers care? ● Build once... (finally) run anywhere (as long as it is a Linux stack) ● A clean, safe, hygienic, 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.
- 5. Why Administrators Care ● 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.
- 6. CFO, CIO, CTO, ... ● Faster Software Development Lifecycle: Development/Testing/Production ● Less overhead ● More consolidation ● More agility ● Reduced cost
- 7. ● Who should care? ● What is the problem? ● What is a container? ● What is Docker ● Docker 101 ● Docker demo ● Docker compose ● Docker compose demo Outline
- 9. The Matrix From Hell
- 10. Solution: Intermodel Shipping Container
- 11. Docker is a shipping container for code
- 12. Docker Eliminates the Matrix from Hell
- 13. Why it works: Separation of concerns
- 14. ● Who should care? ● What is the problem? ● What is a container? ● What is Docker ● Docker 101 ● Docker demo ● Docker compose ● Docker compose demo Outline
- 15. Linux containers Operating-system-level virtualization is a server-virtualization method where the kernel of an operating system allows for multiple isolated user-space instances, instead of just one. On Unix-like operating systems, one can see this technology as an advanced implementation of the standard chroot mechanism.
- 16. ● Who should care? ● What is the problem? ● What is a container? ● What is Docker ● Docker 101 ● Docker demo ● Docker compose ● Docker compose demo Outline
- 17. What is Docker? Docker is an open-source project that automates the deployment of applications inside software containers, by providing an additional layer of abstraction and automation of operating-system-level virtualization on Linux. Docker uses resource isolation features of the Linux kernel such as cgroups and kernel namespaces to allow independent "containers" to run within a single Linux instance, avoiding the overhead of starting and maintaining virtual machines.
- 18. More technical details Why ● Run everywhere ● Regardless of kernel version ● Regardless of host distro ● Physical or virtual, cloud or not ● Container and host architecture must match... ● Run anything ● If it can run on the host, it can run in the container ● If it can run on a Linux kernel, it can run What ● High level: a lightweight VM ● Own process space ● Own network interface ● Can run stuff as root ● Can have its own /sbin/init (different from host) ● Low level: chroot on steroids ● Can also have its own /sbin/init ● Container = isolated processes ● Share kernel with host
- 20. Why are Docker Containers Lightweight
- 21. ● Who should care? ● What is the problem? ● What is a container? ● What is Docker ● Docker 101 ● Docker demo ● Docker compose ● Docker compose demo Outline
- 22. Docker 101 ● docker ps ● docker images ● docker images ubuntu ● docker run -it ubuntu /bin/bash ● docker run -it ubuntu echo “hello world” ● docker run -it -e FOO=bar ubuntu /bin/bash ● docker run --name ubuntu_test -it ubuntu /bin/bash ● docker start ubuntu_test ● docker exec -it test_ubuntu /bin/bash ● docker pull centos ● docker run -d php:5.6-apache ● docker run -v $PWD/www:/var/www/html -d -p 80 php:5.6-apache
- 23. ● Who should care? ● What is the problem? ● What is a container? ● What is Docker ● Docker 101 ● Docker demo ● Docker compose ● Docker compose demo Outline
- 24. Docker compose Compose is a tool for defining and running multi-container applications with Docker. With Compose, you define a multi-container application in a single file, then spin your application up in a single command which does everything that needs to be done to get it running.
- 25. Docker compose (fig) ● docker-compose -f dev.yml up -d
- 26. Enterprise solutions & more docker swarm Google Kubernetes http://kubernetes.io/ DCHQ https://www.dchq.io Tutum https://www.tutum.co/ Microsoft Azure - Docker Amazon AWS
- 27. Q & AThank you