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Added Docker Basics
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‎attendees/readme.adoc‎

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# Docker for Java Developers
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This folder contains instructions to setup an attendee environment.
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This folder contains instructions to setup an attendee environment. Please note, that it is only intended to setup the environment for this lab. The lab itself is in the link:https://github.com/arun-gupta/docker-java/blob/master/readme.adoc[main readme]. Continue with it after you finished this setup.
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Your instructor will have a a machine setup with all the relevant downloads and needed infrastructures. The IP will change depending on the network used. In this guide, it's refered to as <INSTRUCTOR_IP> make sure to replace this with the actuall IP address you get from your instructor.
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## A word about licenses
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This tutorial only uses software which is open source or at least free to use in development and/or education.
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# Linux / MacOS
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curl -L https://get.docker.com/builds/Darwin/x86_64/docker-latest > /usr/local/bin/docker
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#Windows
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curl http://<INSTRUCTOR_IP:8082>/docker-1.6.0.exe
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#Windows
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curl http://<INSTRUCTOR_IP:8082>/docker-1.6.0.exe
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On Windows put into and rename to: c:\docker\docker.exe
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docker-machine create --driver virtualbox --virtualbox-boot2docker-url http://<INSTRUCTOR_IP>:8082/downloads/boot2docker.iso lab
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#TODO This boot2docker instruction is being overwritten. Docker-machine will profine flags for this configuration: https://github.com/docker/machine/pull/1040
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TODO To avoid it to be overwritten the parameter should be included manually. This issue should be fixed on next docker-machine release.
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TODO To avoid it to be overwritten the parameter should be included manually. This issue should be fixed on next docker-machine release.
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docker-machine ssh lab "echo $'EXTRA_ARGS=\"--insecure-registry <INSTRUCTOR_IP>:5000\"' | sudo tee -a /var/lib/boot2docker/profile && sudo /etc/init.d/docker restart"
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eval "$(docker-machine env lab)"
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eval "$(docker-machine env lab)"
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## Setup JBoss Developer Studio
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http://www.jboss.org/download-manager/file/jboss-devstudio-8.1.0.GA-jar_universal.jar[JBoss Developer Studio]
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## Setup JBoss Developer Studio
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Download your platform binary from http://<INSTRUCTOR_IP:8082>/downloads/
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[source, text]
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----
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# Linux / MacOS
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http://www.jboss.org/download-manager/file/jboss-devstudio-8.1.0.GA-jar_universal.jar[JBoss Developer Studio]
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‎images/docker-architecture.png‎

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‎readme.adoc‎

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This lab offers developers an intro-level, hands-on session with Docker, from installation, to exploring Docker Hub, to crafting their own images, to adding Java apps and running custom containers. It will also explain how to use Swarm to orchesorchestrate these containers together. This is a BYOL (bring your own laptop) session, so bring your Windows, OSX, or Linux laptop and be ready to dig into a tool that promises to be at the forefront of our industry for some time to come.
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## Requirements
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This lab can be executed on a netbook with x86 architecture. For it to
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be fun, you should have a decent hardware available.
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### Hardware
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. CPU
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.. x86 (Intel Pentium)
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.. x64 (i7 and comparable)
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.. PowerPC G4
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. Memory
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.. 4 to 8 GB for attendees
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.. 8 to 16 GB for instructors
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#### Software
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. Operating System
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.. Windows 7 (SP1)
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.. Mac OS X (10.6.8)
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.. Fedora 21
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. Java
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.. Oracle JDK 8u45 or a comparable OpenJDK
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## Setup Environments
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This section describes the relevant steps for both attendees and instructors to setup the environments. Please follow the parts, that are appropriate for you.
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link:https://github.com/arun-gupta/docker-java/tree/master/attendees[Go directly to the attendee Setup]
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#### Hardware
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. CPU
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.. x86
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.. x64
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. Memory
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.. min 8 GB for attendees
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.. min 16 GB for instructors
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#### Software
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. Operating System
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.. Windows 7 (SP1)
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.. Mac OS X
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.. Linux / Fedora 21
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### Instructor
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## The Lab
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### Docker Basics
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Docker simplifies software delivery by making it easy to build and share images that contain your application’s entire environment, or application operating system.
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**What does it mean by application operating system ?**
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Your application typically require a specific version of operating system, application server, JDK, database server, may require to tune the configuration files, and similarly multiple other dependencies. The application may need binding to specific ports and certain amount of memory. The components and configuration together required to run your application is what is referred to as application operating system.
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You can certainly provide an installation script that will download and install these components. Docker simplifies this process by allowing to create an image that contains your application and infrastructure together, managed as one component. These images are then used to create Docker containers which run on the container virtualization platform, provided by Docker.
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TODO: Extract some basic information from https://docs.docker.com/introduction/understanding-docker/
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**How is it different from VM?**
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image::https://docs.docker.com/article-img/architecture.svg[Docker, 200,300]
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Docker is an open source container virtualization platform.
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Docker has three main components:
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. __Images__ are *build component* of Docker and a read-only template of application operating system.
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. __Containers__ are *run component* of Docker, and created from, images.Containers can be run, started, stopped, moved, and deleted.
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. Images are stored, shared, and managed in a __registry__, the *distribution component* of Docker. The publically available registry is known as Docker Hub.
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In order for these three components to work together, there is *Docker Daemon* that runs on a host machine and does the heavy lifting of building, running, and distributing Docker containers. In addition, there is *Client* that is a Docker binary which accepts commands from the user and communicates back and forth with the daemon.
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.Docker architecture
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image::images/docker-architecture.png[]
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Client communicates with Daemon, either co-located on the same host, or on a different host. It requests the Daemon to pull an image from the repository using `pull` command. The Daemon then downloads the image from Docker Hub, or whatever registry is configured. Multiple images can be downloaded from the registry and installed on Daemon host. Images are run using `run` command to create containers on demand.
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## References
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. JBoss and Docker: http://www.jboss.org/docker/
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