Docker
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The document provides an overview of Docker, an open platform for developing, shipping, and running applications using container technology, which enhances application isolation and security. It discusses the benefits of Docker, such as portability, scalability, and efficiency in deployment, as well as the differences between Docker containers and traditional virtual machines. Additionally, it covers Docker architecture, including images, registries, and how containers operate within various environments.
![• [1] Charles Anderson : Docker [Software engineering] , Year: 2015, Volume: 32, Issue: 3 Pages: 102 - c3, DOI:
10.1109/MS.2015.62 , IEEE
• [2] J. Petazzoni : Linux Containers (LXC), Docker, and Security , 31 Jan. 2014; www.slideshare.net/jpetazzo/ linux-
containers-lxc-docker-and security.
• [3] D. Bernstein : Containers and Cloud: From LXC to Docker to Kubernetes,IEEE Cloud Computing, vol. 1, no. 3, 2014,
pp. 81–84.
• [4] N. Kratzke : A Lightweight Virtualization Cluster Reference Architecture Derived from Open Source PaaS
Platforms,Open J. Mobile Computing and Cloud Computing, vol. 1, no. 2, 2014, pp. 17–30.
• [5] J. Turnbull: The Docker Book, 2014,www .dockerbook.com.
• [6] S. Soltesz et al : Container-Based Operating System Virtualization: A Scalable, High-Performance Alternative to
Hypervisors,ACM SIGOPS Operating Systems Rev., vol. 41, no. 3, 2007, pp. 275–287
• [7] B. Butler : Containers: Buzzword du Jour,or Game-Changing Technology?,NetworkWorld, 3 Sept. 2014;
www.networkworld.com/article/ 2601925/cloud-computing/container -party-vmware-microsoft-ciscoand -red-hat-
all-get-in-on-app-hoopla .html.](https://image.slidesharecdn.com/docker-161116110047/85/Docker-39-320.jpg)
Docker
- 3. Contents • Introduction to Docker, Containers • Why people care: Separation of Concerns • Technical Discussion • Ecosystem • Use Cases • Docker Futures
- 4. What is Docker? • Docker is an open platform for developing, shipping, and running applications • Docker provides a way to run almost any application securely isolated in a container. The isolation and security allow you to run many containers simultaneously on your host
- 15. Static website Web frontend User DB Queue Analytics DB Background workers API endpoint nginx 1.5 + modsecurity + openssl + bootstrap 2 postgresql + pgv8 + v8 hadoop + hive + thrift + OpenJDK Ruby + Rails + sass + Unicorn Redis + redis-sentinel Python 3.0 + celery + pyredis + libcurl + ffmpeg + libopencv + nodejs + phantomjs Python 2.7 + Flask + pyredis + celery + psycopg + postgresql-client Development VM QA server Public Cloud Disaster recovery Contributor’s laptop Production Servers MultiplicityofStacks Multiplicityof hardware environments Production Cluster Customer Data Center Doservicesandapps interact appropriately? CanImigrate smoothlyand quickly?
- 16. Static website Web frontendUser DB Queue Analytics DB Development VM QA server Public Cloud Contributor’s laptop MultiplicityofStacks Multiplicityof hardware environments Production Cluster Customer Data Center Doservicesandapps interact appropriately? CanImigrate smoothlyandquickly …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…
- 17. Static website Web frontend Background workers User DB Analytics DB Queue Development VM QA Server Single Prod Server Onsite Cluster Public Cloud Contributor’s laptop Customer Servers
- 18. Docker Benifits • Scalable • Portable • Density • Deployment
- 19. Why Docker? • Faster delivery of your applications • Deploying and scaling more easily • Achieving higher density and running more workloads
- 20. • Docker seperates application from infrastructure using Container Technology , similar how virtual machines separate the os from bare metal • Dockerized apps can run anywhere on anything • Build app in any language using any stack Why Docker?
- 21. Why Developers Cares? • 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
- 22. Why it works—separation of concerns • Dan the Developer • Worries about what’s “inside” the container • His code • His Libraries • His Package Manager • His Apps • His Data • All Linux servers look the same • Oscar the Ops Guy • Worries about what’s “outside” the container • Logging • Remote access • Monitoring • Network config • All containers start, stop, copy, attach, migrate, etc. the same way
- 23. • High Level—It’s a lightweight VM • Own process space • Own network interface • Can run stuff as root • Can have its own /sbin/init (different from host) • <<machine container>> • Low Level—It’s chroot on steroids • Can also not have its own /sbin/init • Container=isolated processes • Share kernel with host • No device emulation (neither HVM nor PV) from host) • <<application container>> • Run everywhere • Regardless of kernel version (2.6.32+) • 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 • i.e. if it can run on a Linux kernel, it can run WHY WHAT More technical explanation
- 25. Docker v/s VM Containers are isolated, but share OS and, where appropriate, bins/libraries …result is significantly faster deployment, much less overhead, easier migration, faster restart
- 26. Bins/ Libs App A Original App (No OS to take up space, resources, or require restart) AppΔ Bins/ App A Bins/ Libs App A’ Guest 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 Why are Docker containers lightweight?
- 27. Docker v/s VM
- 29. 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) Docker Architecture
- 30. Changes and Updates Docker Engine Docker Engine Push Update Bins/ Libs App A AppΔ Bins/ Base Container Image Host is now running A’’ Container Mod A’’ AppΔ Bins/ Bins/ Libs App A Bins/ Bins/ Libs App A’’ Host running A wants to upgrade to A’’. Requests update. Gets only diffs Container Mod A’ Docker Container Image Registry
- 31. • Docker daemon The Docker daemon runs on a host machine. The user does not directly interact with the daemon, but instead through the Docker client. • Docker client The Docker client, in the form of the docker binary, is the primary user interface to Docker. It accepts commands from the user and communicates back and forth with a Docker daemon.
- 32. Inside Docker • Docker Images • Docker registries • Docker containers
- 33. Docker images • libvirt: Platform Virtualization • LXC (LinuX Containers): Multiple isolated Linux systems (containers) on a single host • Layered File System
- 35. Docker Container
- 39. • [1] Charles Anderson : Docker [Software engineering] , Year: 2015, Volume: 32, Issue: 3 Pages: 102 - c3, DOI: 10.1109/MS.2015.62 , IEEE • [2] J. Petazzoni : Linux Containers (LXC), Docker, and Security , 31 Jan. 2014; www.slideshare.net/jpetazzo/ linux- containers-lxc-docker-and security. • [3] D. Bernstein : Containers and Cloud: From LXC to Docker to Kubernetes,IEEE Cloud Computing, vol. 1, no. 3, 2014, pp. 81–84. • [4] N. Kratzke : A Lightweight Virtualization Cluster Reference Architecture Derived from Open Source PaaS Platforms,Open J. Mobile Computing and Cloud Computing, vol. 1, no. 2, 2014, pp. 17–30. • [5] J. Turnbull: The Docker Book, 2014,www .dockerbook.com. • [6] S. Soltesz et al : Container-Based Operating System Virtualization: A Scalable, High-Performance Alternative to Hypervisors,ACM SIGOPS Operating Systems Rev., vol. 41, no. 3, 2007, pp. 275–287 • [7] B. Butler : Containers: Buzzword du Jour,or Game-Changing Technology?,NetworkWorld, 3 Sept. 2014; www.networkworld.com/article/ 2601925/cloud-computing/container -party-vmware-microsoft-ciscoand -red-hat- all-get-in-on-app-hoopla .html.