Introduction to docker
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Introduction to docker

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Introduction to docker Introduction to docker Presentation Transcript

  • Introduction to Docker @endhrk
  • Agenda ● What Is Docker ● How To Use Docker – How Do I Install Docker – How Do I Use Docker – How Do I Build containers – How Do I Terminate ● Important Docker terms ● Consisting Of Docker Engine – Lightweight – Portable – Packaging
  • What Is Docker ● Open platform ● For developers and system administrators ● To build, ship ,run applications
  • How To Use Docker ● Install ● Use ● Build ● Delete
  • How Do I Install Docker *may not be the latest Docker release **Install for Ubuntu 14.04 $ sudo apt-get -y install docker.io $ sudo ln -sf /usr/bin/docker.io /usr/local/bin/docker $ sudo gpasswd -a $USER docker
  • How Do I Use Docker $ sudo start docker.io $ docker run -i -t ubuntu /bin/bash root@0f0bd22ce93e:/#
  • How Do I Build Containers ● Dockerfile FROM ubuntu:14.04 RUN apt-get -y install apache2 EXPOSE 80 CMD [“/usr/sbin/apache2ctl”, “-D”, “FOREGROUND”] $ docker build -t apache . $ docker run -d -P apache f254fc1aa31909783a26fb14f80d75ba128762b605604f95ef9a146de0ee46ed
  • How Do I Terminate ● Stop container ● Remove container ● Remove all images ● $ docker stop f254fc1aa319 $ docker rmi `docker images -q` $ docker rm f254fc1aa319
  • Important Docker Terms ● Docker image – Is Read-only template ● ex. contains an Ubuntu with Apache and applications – Is used to create Docker container – Provides simple way for delivery ● Docker registry – Holds images – Provides simple way to upload and download images – Has public and private ● Public is called Docker Hub ● Private Docker registry is provided by docker image at Docker Hub. ● Docker container – Is an isolated and secure application platform – Is created from a Docker image – Can be run, started, stopped, moved, deleted
  • Consisting Of Docker Engine ● Lightweight ● Portable ● Packaging
  • Consisting Of Docker Engine ● Lightweight ● Portable ● Packaging
  • Why Is Docker Lightweight ● Container virtualization ● Union file system
  • Why Is Docker Lightweight ● Container virtualization ● Union file system
  • What Is Container Virtualization ● Virtualization technology – Hardware virtualization (ex. VMware, Hyper-v) – Container virtualization (ex. Docker, OpenVZ)
  • What Are Difference Between Technologies Hardware virtualization Container virtualization What is virtualized Virtualized hardware environment Virtualized OS environment What can be put on Host Different OS Different Lib/Bin (kernel is shared) What is launched Launch OS Launch process How to access I/O Via Virtualized hardware Use directly limited resources
  • What Are Stacks Difference Between Technologies Hardware Hypervisor Bin/Libs MW MW MW App App App Kernel Bin/Libs Kernel Bin/Libs Kernel Virtual Hardware Virtual Hardware Virtual Hardware Hardware Linux kernel Bin/Libs Docker daemon MW MW App App Bin/Libs Bin/Libs Hardware virtualization Container virtualization
  • How Much Are Their Performance Difference CPU Memory fileio 0 sec 5 sec 10 sec 15 sec 20 sec 25 sec 30 sec 35 sec physical docker virtualbox * This benchmark was measured using sysbench
  • Components For Container Virtualization ● Isolation – Identify a set of processes – Isolate resources – Don't recognize each other processes ● Resource control – Limit the resources used * resource = process id, memory, cpu, disk space, network
  • How To Realize Container Virtualization ● Using kernel feature ● Isolation via namespace – PID namespace – Network namespace – UTS namespace (hostname etc.) – IPC namespace – Mount namespace ● Resource control via cgroups – Resource limiting – Prioritization process – Accounting using resources – Control groups
  • What Is Meant By Lightweight For Container ● Container virtualization – Launch faster ● launch only process. Kernel was already booted. – Use resources efficiently ● Kernel and memory are shared – Run process faster ● There is no overhead like hardware virtualization
  • Why Is Docker Lightweight ● Container virtualization ● Union file system
  • What Is Union File System ● Union file system is – Several filesystems to be mounted, appearing to be one filesystem ● Docker uses aufs – You can choose other option (ex. devicemapper
  • How Does Aufs Work 1.Mount a base image as read-only 2.Add read-write file system over read-only file system 3.Change some files and directories to top as read- write file system 4.It is committed 5.Save incremental files and directories in new image 6.Mount the image as read-only and add read-write file system on top
  • How Does Aufs Work
  • What Is Meant By Lightweight For Union File System Bin/Libs MW App Image Bin/Libs MW App Container1 shared MW App Container2 ● Owing to use of union file system – Not changed files are shared for each containers – Storage and memory spaces are saved – Faster deployment of containers shared MW App Container3 shared shared App Container4
  • Consisting Of Docker Engine ● Lightweight ● Portable ● Packaging
  • Why Is Docker Portable ● Run anywhere ● Simple way to take image to another environment ● Copy Incremental files only
  • Which Environment Can I Use ● Run anywhere – Any OS? ● ex. Linux, ?Mac OSX?, ?Windows? – Any Cloud ● ex. Google Cloud Platform, Amazon Web Services, SoftLayer – Any Physical Machine ● ex. Your PC, Server for production *You have to use Docker on Virtualbox if you use Mac OSX or Windows
  • How Can I Take the Image ● Simple way to take image to another environment – Docker Hub (like GitHub) ● Can set tag (version control) ● Easy to push image ● Easy to pull image ● Allow to access from anyone – Private registry ● Can limit access person who is not allowed ● Basic features are same as Docker Hub
  • What Does Docker Copy Bin/Libs MW App Bin/Libs MW App Diff Image Bin/Libs MW App Container Update Container Commit Diff Image Run Run Bin/Libs MW App Diff Container ● Save only changed files ● Push or pull just small increment files
  • What Is Meant By Portable ● Run anywhere ● Simple way to take image to another environment ● Copy Incremental files only
  • Consisting Of Docker Engine ● Lightweight ● Portable ● Packaging
  • What Is Packaged In Docker Image ● Docker image contains – Application – Middleware required by Application – Basic programs (like a OS) – Settings ● Application, Middleware, OS(Disk, Network) ● All of things for running Application
  • What Is Meant By Packaging ● Image contains all of things for running application ● Packaging realize – Portable and reliable application deployments – Rapid and efficient application delivery – Simplified application runtime environment – Coding explicit knowledge
  • Review ● How to use Docker ● Important docker terms ● Consisting of Docker Engine – Lightweight – Portable – Packaging
  • Thanks