Docker container a-brief_introduction_2016-01-30
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A brief introduction to Docker Container technology done at Gurgaon Docker Container Meetup on 30-Jan-2016. Includes command to launch a simple 2 container linked application that hosts a Etherlite web application.
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Docker container a-brief_introduction_2016-01-30
- 1. Docker Container A BRIEF INTRODUCTION (GURGAON, 30-JAN-2016) KHELENDER SASAN
- 2. Agenda ▌What is Docker? Build apps once, run anywhere ! VM versus Containers (Enabling) Platform for distributed apps! ▌Design & Technology Introduction Docker Architecture ▌Hands-on usage demonstration
- 3. Build once, RUN anywhere… WHAT IS DOCKER?
- 4. Challenge of Software Industry Source: http://www.slideshare.net/Docker/dockerintronovember- 131125185628phpapp02-37588934
- 5. Dependency Hell (libraries / packages / ….) Source: http://www.slideshare.net/Docker/dockerintronovember-131125185628phpapp02-37588934
- 6. Cargo transport (pre-1960….) Source: http://www.slideshare.net/Docker/dockerintronovember-131125185628phpapp02-37588934
- 7. Solution for Shipping Industry…. Source: http://www.slideshare.net/Docker/dockerintronovember-131125185628phpapp02-37588934 Multiplicityof Goods Multiplicityof methodsfor transporting/storing DoIworryabouthow goodsinteract(e.g. coffeebeansnextto spices) CanItransportquickly andsmoothly (e.g.fromboattotrain totruck) …in between, can be 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. Solution for Software Industry…. Source: http://www.slideshare.net/Docker/dockerintronovember-131125185628phpapp02-37588934
- 10. Hypervisor VM versus Docker Containers •Includes hardware simulation & OS execution •Requires order of GB – 100s of MBs of memory for each instance (Heavy Weight) •Can simulate few VMs per server (Expensive) •Instance launch complete takes several seconds minute (slower) Virtual Machine (Hardware virtualization) •Based on Linux Containers and Union File System. •Requires order of few MBs of memory for each instance (Light Weight) •Can simulate much higher containers per server (Cheaper) •Instance launched in sub-second time- frame (much faster) Docker containers (OS level virtualization)
- 11. Enabling Platform for distributed computing…. FOUND NEW AREAS OF APPLICATION
- 13. Enabling Distributed computing (Google Kubernetes)
- 14. Enabling Hadoop (Distributed computing platform)
- 15. CoreOS Gogeta
- 16. Design & Technology WHAT IS DOCKER?
- 17. Docker Technology : Introduction Traditional Hypervisor based VMs Container based Application execution Framework built on top of Linux containers that can package an application and its dependencies => Can be launched / deployed in form of software container on any Linux server (providing portability of underlying platform: cloud, bare-metal, server, desktop or laptop)
- 18. Docker Technology Introduction….continued… Container relies on Linux kernel facilities: chroot, cgroups and name-space facilities that provide resource isolation (CPU, memory, block I/O, network, etc.) => Doesn’t require a separate OS instance. Docker provides framework & a high level API over Linux containers for portable deployment of applications across machines Docker provides versioning capability to track successive versions of a container Docker uses AUFS (Advanced multi-layered Unification File System) – It greatly enhances the performance of docker containers and provides for optimized usage of underlying disk resources
- 20. Usage Flow
- 21. Docker Platform for Distributed computing…. Docker Machine Docker Machine takes you from zero-to-Docker in seconds with a single command. Before Docker Machine, a developer would need to log in to the host and follow installation and configuration instructions specifically for that host and its OS. With Docker Machine, whether provisioning the Docker daemon on a new laptop, on virtual machines in the data center, or on a public cloud instance, the same, single command Docker Swarm Docker Swarm is native clustering for Dockerized distributed apps. It picks-up where Docker Machines leaves off by optimizing host resource utilization and providing failover services. Specifically, Docker Swarm allows users to create resource pools of hosts running Docker daemons and then schedule Docker containers to run on top, automatically managing workload placement and maintaining cluster state. Docker Compose Docker Compose is the last piece of the orchestration puzzle. After provisioning Docker daemons on any host in any location with Docker Machine and clustering them with Docker Swarm, users can employ Docker Compose to assemble multi-container distributed apps that run on top of these clusters.
- 23. Setting it up and downloading a sample image… Docker installation Download an existing container image from public docker registry
- 24. A simple 2 linked Container setup… Server Host OS Docker Engine Bin/Libs Etherlite Etherlite Bin/Libs- 2 mysql
- 25. A simple 2-tier web application (ether-lite) $ mkdir demo $ cd demo $ mkdir mysql_data $ docker run -d -e MYSQL_ROOT_PASSWORD=password --name demo_mysql -v $PWD/mysql_data:/var/lib/mysql mysql <Container ID> $ docker run -d --link=demo_mysql:mysql -p 9001:9001 mkodockx/docker-etherpad <Container ID> <<< Another instance for scaling can be added as well !!>>> $ docker run -d --link=demo_mysql:mysql -p 9002:9001 mkodockx/docker-etherpad
Editor's Notes
- #17: http://hortonworks.com/blog/openshift-v3-kubernetes-docker-hadoop-yarn/