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<!DOCTYPE html>
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<title>Docker and Kubernetes for Java EE Developers</title>
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<body class="article">
<div id="header">
<h1>Docker and Kubernetes for Java EE Developers</h1>
<div class="details">
<span id="author" class="author">v1.2.x, Aug 13, 2015</span><br>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div id="toc" class="toc">
<div id="toctitle" class="title">Table of Dockernetes</div>
<ul class="sectlevel1">
<li><a href="#_preface">Preface</a></li>
<li><a href="#_setup_environments">Setup Environments</a>
<ul class="sectlevel2">
<li><a href="#_hardware">Hardware</a></li>
<li><a href="#_software">Software</a></li>
<li><a href="#_git_client">Git Client</a></li>
<li><a href="#_maven">Maven</a></li>
<li><a href="#_virtualbox">VirtualBox</a></li>
<li><a href="#_vagrant">Vagrant</a></li>
<li><a href="#_docker_machine">Docker Machine</a></li>
<li><a href="#_create_lab_docker_host">Create Lab Docker Host</a></li>
<li><a href="#_docker_client">Docker Client</a></li>
<li><a href="#_kubernetes">Kubernetes</a></li>
<li><a href="#_wildfly">WildFly</a></li>
<li><a href="#_jboss_developer_studio_9_beta_2">JBoss Developer Studio 9 - Beta 2</a></li>
</ul>
</li>
<li><a href="#_docker_basics">Docker Basics</a>
<ul class="sectlevel2">
<li><a href="#_docker_machine_2">Docker Machine</a></li>
<li><a href="#_docker_client_2">Docker Client</a></li>
<li><a href="#_verify_docker_configuration">Verify Docker Configuration</a></li>
</ul>
</li>
<li><a href="#_run_container">Run Container</a>
<ul class="sectlevel2">
<li><a href="#_pull_image">Pull Image</a></li>
<li><a href="#_run_container_2">Run Container</a>
<ul class="sectlevel3">
<li><a href="#_interactive_container">Interactive Container</a></li>
<li><a href="#_detached_container">Detached Container</a></li>
</ul>
</li>
<li><a href="#_run_container_with_default_port">Run Container with Default Port</a></li>
<li><a href="#_run_container_with_specified_port">Run Container with Specified Port</a></li>
<li><a href="#Enabling_WildFly_Administration">Enabling WildFly Administration</a>
<ul class="sectlevel3">
<li><a href="#_default_port_mapping">Default Port Mapping</a></li>
<li><a href="#Management_Fixed_Port_Mapping">Fixed Port Mapping</a></li>
</ul>
</li>
<li><a href="#_stop_and_remove_container">Stop and Remove Container</a>
<ul class="sectlevel3">
<li><a href="#_stop_container">Stop Container</a></li>
<li><a href="#_remove_container">Remove Container</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#JavaEE7_PreBuilt_WAR">Deploy Java EE 7 Application (Pre-Built WAR)</a></li>
<li><a href="#JavaEE7_Container_Linking">Deploy Java EE 7 Application (Container Linking)</a></li>
<li><a href="#_build_and_deploy_java_ee_7_application">Build and Deploy Java EE 7 Application</a>
<ul class="sectlevel2">
<li><a href="#Build_Application">Build Application</a></li>
<li><a href="#_start_application_server">Start Application Server</a></li>
<li><a href="#_configure_jboss_developer_studio">Configure JBoss Developer Studio</a></li>
<li><a href="#_deploy_application_using_shared_volumes">Deploy Application Using Shared Volumes</a></li>
<li><a href="#_deploy_application_using_cli">Deploy Application Using CLI</a></li>
<li><a href="#_deploy_application_using_web_console">Deploy Application Using Web Console</a></li>
<li><a href="#_deploy_application_using_management_api">Deploy Application Using Management API</a></li>
</ul>
</li>
<li><a href="#_docker_maven_plugin">Docker Maven Plugin</a>
<ul class="sectlevel2">
<li><a href="#_run_java_ee_application">Run Java EE Application</a></li>
<li><a href="#_understand_plugin_configuration">Understand Plugin Configuration</a></li>
</ul>
</li>
<li><a href="#_docker_tools_in_eclipse">Docker Tools in Eclipse</a>
<ul class="sectlevel2">
<li><a href="#_install_docker_tools_plugins">Install Docker Tools Plugins</a></li>
<li><a href="#_docker_explorer">Docker Explorer</a></li>
<li><a href="#_docker_images">Docker Images</a></li>
<li><a href="#_docker_containers">Docker Containers</a></li>
<li><a href="#_details_on_images_and_containers">Details on Images and Containers</a></li>
</ul>
</li>
<li><a href="#_test_java_ee_applications_on_docker">Test Java EE Applications on Docker</a></li>
<li><a href="#Docker_Compose">Multiple Containers Using Docker Compose</a>
<ul class="sectlevel2">
<li><a href="#_configuration_file">Configuration File</a></li>
<li><a href="#_start_services">Start Services</a></li>
<li><a href="#_verify_application">Verify Application</a></li>
<li><a href="#_stop_services">Stop Services</a></li>
<li><a href="#_scale_services">Scale Services</a></li>
</ul>
</li>
<li><a href="#_java_ee_application_on_docker_swarm_cluster">Java EE Application on Docker Swarm Cluster</a>
<ul class="sectlevel2">
<li><a href="#_key_components_of_docker_swarm">Key Components of Docker Swarm</a></li>
<li><a href="#_create_a_docker_swarm_cluster">Create a Docker Swarm Cluster</a></li>
<li><a href="#_deploy_java_ee_application_to_docker_swarm_cluster">Deploy Java EE Application to Docker Swarm Cluster</a></li>
<li><a href="#_deploy_java_ee_application_to_docker_swarm_cluster_using_docker_compose">Deploy Java EE Application to Docker Swarm Cluster using Docker Compose</a></li>
</ul>
</li>
<li><a href="#_java_ee_application_on_kubernetes_cluster">Java EE Application on Kubernetes Cluster</a>
<ul class="sectlevel2">
<li><a href="#_key_components">Key Components</a></li>
<li><a href="#_start_kubernetes_cluster">Start Kubernetes Cluster</a>
<ul class="sectlevel3">
<li><a href="#_using_previously_downloaded_kubernetes_distribution">Using Previously Downloaded Kubernetes Distribution</a></li>
<li><a href="#_download_and_start_the_cluster_together">Download and Start the Cluster Together</a></li>
<li><a href="#_verify_the_cluster">Verify the Cluster</a></li>
</ul>
</li>
<li><a href="#_deploy_java_ee_application">Deploy Java EE Application</a>
<ul class="sectlevel3">
<li><a href="#_start_mysql_pod">Start MySQL Pod</a></li>
<li><a href="#_start_mysql_service">Start MySQL service</a></li>
<li><a href="#_start_wildfly_replication_controller">Start WildFly Replication Controller</a></li>
<li><a href="#_access_the_application">Access the application</a></li>
</ul>
</li>
<li><a href="#_rescheduling_pods">Rescheduling Pods</a></li>
<li><a href="#_scaling_pods">Scaling Pods</a></li>
<li><a href="#_application_logs">Application Logs</a></li>
<li><a href="#_delete_kubernetes_resources">Delete Kubernetes Resources</a></li>
<li><a href="#_stop_kubernetes_cluster">Stop Kubernetes Cluster</a></li>
<li><a href="#_debug_kubernetes_master">Debug Kubernetes Master</a></li>
</ul>
</li>
<li><a href="#Common_Docker_Commands">Common Docker Commands</a></li>
<li><a href="#_references">References</a></li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_preface">Preface</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Containers are enabling developers to package their applications (and underlying dependencies) in new ways that are portable and work consistently everywhere? On your machine, in production, in your data center, and in the cloud. And Docker has become the de facto standard for those portable containers in the cloud.</p>
</div>
<div class="paragraph">
<p>Docker is the developer-friendly Linux container technology that enables creation of your stack: OS, JVM, app server, app, and all your custom configuration. So with all it offers, how comfortable are you and your team taking Docker from development to production? Are you hearing developers say, “But it works on my machine!” when code breaks in production?</p>
</div>
<div class="paragraph">
<p>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.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
Latest content of this lab is always at <a href="https://github.com/javaee-samples/docker-java" class="bare">https://github.com/javaee-samples/docker-java</a>
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_setup_environments">Setup Environments</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This section describes what, how, and where to install the software needed for this lab. This lab is designed for a BYOL (Brying Your Own Laptop) style hands-on-lab.</p>
</div>
<div class="sect2">
<h3 id="_hardware">Hardware</h3>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Operating System: Mac OS X (10.8 or later), Windows 7 (SP1), Fedora (21 or later)</p>
</li>
<li>
<p>Memory: At least 4 GB+, preferred 8 GB</p>
</li>
</ol>
</div>
</div>
<div class="sect2">
<h3 id="_software">Software</h3>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Java: <a href="http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html">Oracle JDK 8u45</a></p>
</li>
<li>
<p>Web Browser</p>
<div class="olist loweralpha">
<ol class="loweralpha" type="a">
<li>
<p><a href="https://www.google.com/chrome/browser/desktop/">Chrome</a></p>
</li>
<li>
<p><a href="http://www.getfirefox.com">Firefox</a></p>
</li>
</ol>
</div>
</li>
</ol>
</div>
</div>
<div class="sect2">
<h3 id="_git_client">Git Client</h3>
<div class="paragraph">
<p>Install Git Client as explained at: <a href="https://git-scm.com/book/en/v2/Getting-Started-Installing-Git" class="bare">https://git-scm.com/book/en/v2/Getting-Started-Installing-Git</a></p>
</div>
</div>
<div class="sect2">
<h3 id="_maven">Maven</h3>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Download Apache Maven from
<a href="https://maven.apache.org/download.cgi" class="bare">https://maven.apache.org/download.cgi</a></p>
</li>
<li>
<p>Unzip to a directory of your choice and add it to the <code>PATH</code>.</p>
</li>
</ol>
</div>
</div>
<div class="sect2">
<h3 id="_virtualbox">VirtualBox</h3>
<div class="paragraph">
<p>Docker currently runs natively on Linux. It can be configured to run in a virtual machine on Mac or Windows. This is why Virtualbox is a requirement for Mac or Windows.</p>
</div>
<div class="paragraph">
<p>Downloads are available from
<a href="https://www.virtualbox.org/" class="bare">https://www.virtualbox.org/</a>
.</p>
</div>
<div class="paragraph">
<p>Virtual Box 5.0.0 does not allow Kubernetes cluster to be started: <a href="https://github.com/kubernetes/kubernetes/issues/12614" class="bare">https://github.com/kubernetes/kubernetes/issues/12614</a>. Make sure to download VirtualBox 4.3.30.</p>
</div>
<div class="admonitionblock warning">
<table>
<tr>
<td class="icon">
<div class="title">Warning</div>
</td>
<td class="content">
<div class="paragraph">
<p>Linux Users</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Have your kernel updated</p>
</li>
<li>
<p>Users should have the GNU compiler, build and header files for your current Linux kernel</p>
</li>
<li>
<p>Create a <code>/usr/src/linux</code> link to the current kernel source</p>
</li>
</ol>
</div>
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_vagrant">Vagrant</h3>
<div class="paragraph">
<p>Download Vagrant from
<a href="https://www.vagrantup.com/downloads.html" class="bare">https://www.vagrantup.com/downloads.html</a>
and install.</p>
</div>
</div>
<div class="sect2">
<h3 id="_docker_machine">Docker Machine</h3>
<div class="paragraph">
<p>Docker Machine makes it really easy to create Docker hosts on your computer, on cloud providers and inside your own data center. It creates servers, installs Docker on them, then configures the Docker client to talk to them.</p>
</div>
<div class="paragraph">
<p>Install as explained at: <a href="https://docs.docker.com/machine/#installation" class="bare">https://docs.docker.com/machine/#installation</a></p>
</div>
<div class="paragraph">
<p>On Windows copy the file in a convenience directory that is included in the <code>PATH</code> variable.</p>
</div>
</div>
<div class="sect2">
<h3 id="_create_lab_docker_host">Create Lab Docker Host</h3>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Create Docker Host to be used in the lab:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-text" data-lang="text">docker-machine create --driver=virtualbox lab
eval "$(docker-machine env lab)"</code></pre>
</div>
</div>
</li>
<li>
<p>To make it easier to start/stop the containers, an entry is added into the host mapping table of your operating system. Find out the IP address of your machine:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-text" data-lang="text">docker-machine ip lab</code></pre>
</div>
</div>
<div class="paragraph">
<p>This will provide the IP address associated with the Docker Machine created earlier.</p>
</div>
</li>
<li>
<p>Edit <code>/etc/hosts</code> (Mac OS or Linux) or <code>C:\Windows\System32\drivers\etc\hosts</code> (Windows) and add:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-text" data-lang="text"><IP ADDRESS> dockerhost</code></pre>
</div>
</div>
</li>
</ol>
</div>
</div>
<div class="sect2">
<h3 id="_docker_client">Docker Client</h3>
<div class="paragraph">
<p>Docker Client is used to communicate with Docker Host.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-text" data-lang="text"># Mac
curl -L https://get.docker.com/builds/Darwin/x86_64/docker-latest > /usr/local/bin/docker
chmod +x /usr/local/bin/docker
# Linux
curl -L https://get.docker.com/builds/Linux/x86_64/docker-latest > docker-latest-linux
chmod +x /usr/local/bin/docker
# Windows
curl -L http://test.docker.com.s3.amazonaws.com/builds/Windows/x86_64/docker-1.7.0.exe -o docker.exe</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_kubernetes">Kubernetes</h3>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Download Kubernetes (1.0.1) from
<a href="https://github.com/kubernetes/kubernetes/releases/download/v1.0.1/kubernetes.tar.gz" class="bare">https://github.com/kubernetes/kubernetes/releases/download/v1.0.1/kubernetes.tar.gz</a></p>
</li>
<li>
<p>Extract the archive and install it by:</p>
</li>
</ol>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-text" data-lang="text">export KUBERNETES_PROVIDER=vagrant
cd kubernetes
./cluster/kube-up.sh</code></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
Kubernetes 1.0.1 is the only version verified to work with Virtual Box. More details at: <a href="https://github.com/kubernetes/kubernetes/issues/12614" class="bare">https://github.com/kubernetes/kubernetes/issues/12614</a>
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_wildfly">WildFly</h3>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Download WildFly 9.0 from
<a href="http://download.jboss.org/wildfly/8.2.0.Final/wildfly-9.0.0.Final.zip" class="bare">http://download.jboss.org/wildfly/8.2.0.Final/wildfly-9.0.0.Final.zip</a></p>
</li>
<li>
<p>Install it by extracting the archive.</p>
</li>
</ol>
</div>
</div>
<div class="sect2">
<h3 id="_jboss_developer_studio_9_beta_2">JBoss Developer Studio 9 - Beta 2</h3>
<div class="paragraph">
<p>To install JBoss Developer Studio stand-alone, complete the following steps:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Download
<a href="http://tools.jboss.org/downloads/devstudio/mars/9.0.0.Beta2.html">9.0.0 Beta 2</a>
<a href="https://devstudio.redhat.com/9.0/snapshots/builds/devstudio.product_master/latest/installer/">Laest Nightly</a> (used with the lab)</p>
</li>
<li>
<p>Start the installer as:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-text" data-lang="text">java -jar <JAR FILE NAME></code></pre>
</div>
</div>
<div class="paragraph">
<p>Follow the on-screen instructions to complete the installation process.</p>
</div>
</li>
</ol>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_docker_basics">Docker Basics</h2>
<div class="sectionbody">
<div class="paragraph">
<p><strong>PURPOSE</strong>: This chapter introduces the basic terminology of Docker.</p>
</div>
<div class="quoteblock">
<blockquote>
Docker is a platform for developers and sysadmins to develop, ship, and run applications. Docker lets you quickly assemble applications from components and eliminates the friction that can come when shipping code. Docker lets you get your code tested and deployed into production as fast as possible.
</blockquote>
<div class="attribution">
— docs.docker.com/
</div>
</div>
<div class="paragraph">
<p>Docker simplifies software delivery by making it easy to build and share images that contain your application’s entire environment, or <em>application operating system</em>.</p>
</div>
<div class="paragraph">
<p><strong>What does it mean by an application operating system ?</strong></p>
</div>
<div class="paragraph">
<p>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.</p>
</div>
<div class="paragraph">
<p>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.</p>
</div>
<div class="paragraph">
<p><strong>Main Components of Docker</strong></p>
</div>
<div class="paragraph">
<p>Docker has three main components:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p><em>Images</em> are <strong>build component</strong> of Docker and a read-only template of application operating system.</p>
</li>
<li>
<p><em>Containers</em> are <strong>run component</strong> of Docker, and created from, images.Containers can be run, started, stopped, moved, and deleted.</p>
</li>
<li>
<p>Images are stored, shared, and managed in a <em>registry</em>, the <strong>distribution component</strong> of Docker. The publically available registry is known as Docker Hub (available at <a href="http://hub.docker.com" class="bare">http://hub.docker.com</a>).</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>In order for these three components to work together, there is <strong>Docker Daemon</strong> that runs on a host machine and does the heavy lifting of building, running, and distributing Docker containers. In addition, there is <strong>Client</strong> that is a Docker binary which accepts commands from the user and communicates back and forth with the daemon.</p>
</div>
<div class="imageblock">
<div class="content">
<img src="./chapters/images//docker-architecture.png" alt="docker architecture">
</div>
<div class="title">Figure 1. Docker architecture</div>
</div>
<div class="paragraph">
<p>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 <code>pull</code> 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 <code>run</code> command to create containers on demand.</p>
</div>
<div class="paragraph">
<p><strong>How does a Docker Image work?</strong></p>
</div>
<div class="paragraph">
<p>We’ve already seen that Docker images are read-only templates from which Docker containers are launched. Each image consists of a series of layers. Docker makes use of union file systems to combine these layers into a single image. Union file systems allow files and directories of separate file systems, known as branches, to be transparently overlaid, forming a single coherent file system.</p>
</div>
<div class="paragraph">
<p>One of the reasons Docker is so lightweight is because of these layers. When you change a Docker image—for example, update an application to a new version— a new layer gets built. Thus, rather than replacing the whole image or entirely rebuilding, as you may do with a virtual machine, only that layer is added or updated. Now you don’t need to distribute a whole new image, just the update, making distributing Docker images faster and simpler.</p>
</div>
<div class="paragraph">
<p>Every image starts from a base image, for example <code>ubuntu</code>, a base Ubuntu image, or <code>fedora</code>, a base Fedora image. You can also use images of your own as the basis for a new image, for example if you have a base Apache image you could use this as the base of all your web application images.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
By default, Docker obtains these base images from Docker Hub.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>Docker images are then built from these base images using a simple, descriptive set of steps we call instructions. Each instruction creates a new layer in our image. Instructions include actions like:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Run a command</p>
</li>
<li>
<p>Add a file or directory</p>
</li>
<li>
<p>Create an environment variable</p>
</li>
<li>
<p>Run a process when launching a container</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>These instructions are stored in a file called a Dockerfile. Docker reads this Dockerfile when you request a build of an image, executes the instructions, and returns a final image.</p>
</div>
<div class="paragraph">
<p><strong>How does a Container work?</strong></p>
</div>
<div class="paragraph">
<p>A container consists of an operating system, user-added files, and meta-data. As we’ve seen, each container is built from an image. That image tells Docker what the container holds, what process to run when the container is launched, and a variety of other configuration data. The Docker image is read-only. When Docker runs a container from an image, it adds a read-write layer on top of the image (using a union file system as we saw earlier) in which your application can then run.</p>
</div>
<div class="sect2">
<h3 id="_docker_machine_2">Docker Machine</h3>
<div class="paragraph">
<p>Machine makes it really easy to create Docker hosts on your computer, on cloud providers and inside your own data center. It creates servers, installs Docker on them, then configures the Docker client to talk to them.</p>
</div>
<div class="paragraph">
<p>Once your Docker host has been created, it then has a number of commands for managing containers:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Start, stop, restart container</p>
</li>
<li>
<p>Upgrade Docker</p>
</li>
<li>
<p>Configure the Docker client to talk to a host</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>You used Docker Machine already during the attendee setup. We won’t need it too much further on. But if you need to create hosts, it’s a very handy tool to know about. From now on we’re mostly going to use the docker client.</p>
</div>
<div class="paragraph">
<p>Find out more about the details at the <a href="https://docs.docker.com/machine/">Docker Machine Website</a>.</p>
</div>
<div class="paragraph">
<p>Check if docker machine is working:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>docker-machine -v</pre>
</div>
</div>
<div class="paragraph">
<p>It shows the output similar to the one shown below:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>docker-machine version 0.3.0 (0a251fe)</pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
The exact version may differ based upon how recently the installation was performed.
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_docker_client_2">Docker Client</h3>
<div class="paragraph">
<p>The client communicates with the demon process on your host and let’s you work with images and containers.</p>