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     <h1>Containerizer</h1>

 <h2>Motivation</h2>

 <p>Containerizers are intended to run tasks in &lsquo;containers&rsquo; which in turn are used
 to:</p>

 <ul>
 <li>Isolate a task from other running tasks.</li>
 <li>&lsquo;Contain&rsquo; tasks to run in limited resource runtime environment.</li>
 <li>Control task&rsquo;s individual resources (e.g, CPU, memory) programatically.</li>
 <li>Run software in a pre-packaged file system image, allowing it to run in
 different environments.</li>
 </ul>


 <h2>Types of containerizers</h2>

 <p>Mesos plays well with existing container technologies (e.g., docker) and also
 provides its own container technology. It also supports composing different
 container technologies(e.g., docker and mesos).</p>

 <p>Mesos implements the following containerizers:</p>

 <ul>
 <li><a href="#Composing">Composing</a></li>
 <li><a href="#Docker">Docker</a></li>
 <li><a href="#Mesos">Mesos (default)</a></li>
 <li>External (deprecated)</li>
 </ul>


 <p>User can specify the types of containerizers to use via the agent flag
 <code>--containerizers</code>.</p>

 <p><a name="Composing"></a></p>

 <h3>Composing containerizer</h3>

 <p>This feature allows multiple container technologies to play together. It is
 enabled when you configure the <code>--containerizers</code> agent flag with multiple comma
 seperated containerizer names (e.g., <code>--containerizers=mesos,docker</code>). The order
 of the comma separated list is important as the first containerizer that
 supports the task&rsquo;s container configuration will be used to launch the task.</p>

 <p>Use cases:</p>

 <ul>
 <li>For testing tasks with different types of resource isolations. Since &lsquo;mesos&rsquo;
 containerizers have more isolation abilities, a framework can use composing
 containerizer to test a task using &lsquo;mesos&rsquo; containerizer&rsquo;s controlled
 environment and at the same time test it to work with &lsquo;docker&rsquo; containers by
 just changing the container parameters for the task.</li>
 </ul>


 <p><a name="Docker"></a></p>

 <h3>Docker containerizer</h3>

 <p>Docker containerizer allows tasks to be run inside docker container. This
 containerizer is enabled when you configure the agent flag as
 <code>--containerizers=docker</code>.</p>

 <p>Use cases:</p>

 <ul>
 <li>If task needs to be run with the tooling that comes with the docker package.</li>
 <li>If Mesos agent is running inside a docker container.</li>
 </ul>


 <p>For more details, see
 <a href="/documentation/latest/./docker-containerizer/">Docker Containerizer</a>.</p>

 <p><a name="Mesos"></a></p>

 <h3>Mesos containerizer</h3>

 <p>This containerizer allows tasks to be run with an array of pluggable isolators
 provided by Mesos. This is the native Mesos containerizer solution and is
 enabled when you configure the agent flag as <code>--containerizers=mesos</code>.</p>

 <p>Use cases:</p>

 <ul>
 <li>Allow Mesos to control the task&rsquo;s runtime environment without depending on
 other container technologies (e.g., docker).</li>
 <li>Want fine grained operating system controls (e.g., cgroups/namespaces provided
 by linux).</li>
 <li>Want Mesos&rsquo;s latest container technology features.</li>
 <li>Need additional resource controls like disk usage limits, which
 might not be provided by other container technologies.</li>
 <li>Want to add custom isolation for tasks.</li>
 </ul>


 <p>For more details, see
 <a href="/documentation/latest/./mesos-containerizer/">Mesos Containerizer</a>.</p>

 <h2>References</h2>

 <ul>
 <li><a href="/documentation/latest/./containerizer-internals/">Containerizer Internals</a> for
 implementation details of containerizers.</li>
 </ul>


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	<h1>Containerizer</h1>

	<h2>Motivation</h2>

	<p>Containerizers are intended to run tasks in ‘containers’ which in turn are used
	to:</p>

	<ul>
	<li>Isolate a task from other running tasks.</li>
	<li>‘Contain’ tasks to run in limited resource runtime environment.</li>
	<li>Control task’s individual resources (e.g, CPU, memory) programatically.</li>
	<li>Run software in a pre-packaged file system image, allowing it to run in
	different environments.</li>
	</ul>


	<h2>Types of containerizers</h2>

	<p>Mesos plays well with existing container technologies (e.g., docker) and also
	provides its own container technology. It also supports composing different
	container technologies(e.g., docker and mesos).</p>

	<p>Mesos implements the following containerizers:</p>

	<ul>
	<li><a href="#Composing">Composing</a></li>
	<li><a href="#Docker">Docker</a></li>
	<li><a href="#Mesos">Mesos (default)</a></li>
	<li>External (deprecated)</li>
	</ul>


	<p>User can specify the types of containerizers to use via the agent flag
	<code>--containerizers</code>.</p>

	<p><a name="Composing"></a></p>

	<h3>Composing containerizer</h3>

	<p>This feature allows multiple container technologies to play together. It is
	enabled when you configure the <code>--containerizers</code> agent flag with multiple comma
	seperated containerizer names (e.g., <code>--containerizers=mesos,docker</code>). The order
	of the comma separated list is important as the first containerizer that
	supports the task’s container configuration will be used to launch the task.</p>

	<p>Use cases:</p>

	<ul>
	<li>For testing tasks with different types of resource isolations. Since ‘mesos’
	containerizers have more isolation abilities, a framework can use composing
	containerizer to test a task using ‘mesos’ containerizer’s controlled
	environment and at the same time test it to work with ‘docker’ containers by
	just changing the container parameters for the task.</li>
	</ul>


	<p><a name="Docker"></a></p>

	<h3>Docker containerizer</h3>

	<p>Docker containerizer allows tasks to be run inside docker container. This
	containerizer is enabled when you configure the agent flag as
	<code>--containerizers=docker</code>.</p>

	<p>Use cases:</p>

	<ul>
	<li>If task needs to be run with the tooling that comes with the docker package.</li>
	<li>If Mesos agent is running inside a docker container.</li>
	</ul>


	<p>For more details, see
	<a href="/documentation/latest/./docker-containerizer/">Docker Containerizer</a>.</p>

	<p><a name="Mesos"></a></p>

	<h3>Mesos containerizer</h3>

	<p>This containerizer allows tasks to be run with an array of pluggable isolators
	provided by Mesos. This is the native Mesos containerizer solution and is
	enabled when you configure the agent flag as <code>--containerizers=mesos</code>.</p>

	<p>Use cases:</p>

	<ul>
	<li>Allow Mesos to control the task’s runtime environment without depending on
	other container technologies (e.g., docker).</li>
	<li>Want fine grained operating system controls (e.g., cgroups/namespaces provided
	by linux).</li>
	<li>Want Mesos’s latest container technology features.</li>
	<li>Need additional resource controls like disk usage limits, which
	might not be provided by other container technologies.</li>
	<li>Want to add custom isolation for tasks.</li>
	</ul>


	<p>For more details, see
	<a href="/documentation/latest/./mesos-containerizer/">Mesos Containerizer</a>.</p>

	<h2>References</h2>

	<ul>
	<li><a href="/documentation/latest/./containerizer-internals/">Containerizer Internals</a> for
	implementation details of containerizers.</li>
	</ul>


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