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<div class="section" id="command-executor">
<h1>Command Executor<a class="headerlink" href="#command-executor" title="Permalink to this headline">¶</a></h1>
<p><code class="docutils literal notranslate"><span class="pre">Command</span> <span class="pre">Executor</span></code> provides a functionality to run operators in various environment like Docker.</p>
<p><code class="docutils literal notranslate"><span class="pre">sh></span></code>, <code class="docutils literal notranslate"><span class="pre">py></span></code>, and <code class="docutils literal notranslate"><span class="pre">rb></span></code> support Command Executor.</p>
<p>Supported environments are <code class="docutils literal notranslate"><span class="pre">AWS</span> <span class="pre">ECS</span> <span class="pre">(Elastic</span> <span class="pre">Container</span> <span class="pre">Service)</span></code>, <code class="docutils literal notranslate"><span class="pre">Docker</span></code>, and local.
<code class="docutils literal notranslate"><span class="pre">Kubernetes</span></code> is under development.</p>
<p>For example, if you define a task with <code class="docutils literal notranslate"><span class="pre">sh></span></code>, the task runs in local. If you add configuration for Docker, the task is executed in a docker container.
You can switch environment to run a task without changing task definition.</p>
<p>Currently, ECS is default Command Executor.
If there is no valid configuration for ECS, fallback to Docker.
If there is no valid configuration for Docker, fallback to local.</p>
<div class="section" id="ecs">
<h2>ECS<a class="headerlink" href="#ecs" title="Permalink to this headline">¶</a></h2>
<div class="section" id="setup">
<h3>Setup<a class="headerlink" href="#setup" title="Permalink to this headline">¶</a></h3>
<p>The following is an example configuration for ECS Command Executor.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">agent</span><span class="o">.</span><span class="n">command_executor</span><span class="o">.</span><span class="n">ecs</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="n">digdag</span><span class="o">-</span><span class="n">test</span>
<span class="n">agent</span><span class="o">.</span><span class="n">command_executor</span><span class="o">.</span><span class="n">ecs</span><span class="o">.</span><span class="n">digdag</span><span class="o">-</span><span class="n">test</span><span class="o">.</span><span class="n">access_key_id</span> <span class="o">=</span> <span class="o"><</span><span class="n">ACCESS</span> <span class="n">KEY</span><span class="o">></span>
<span class="n">agent</span><span class="o">.</span><span class="n">command_executor</span><span class="o">.</span><span class="n">ecs</span><span class="o">.</span><span class="n">digdag</span><span class="o">-</span><span class="n">test</span><span class="o">.</span><span class="n">secret_access_key</span> <span class="o">=</span> <span class="o"><</span><span class="n">SECRET</span> <span class="n">KEY</span><span class="o">></span>
<span class="n">agent</span><span class="o">.</span><span class="n">command_executor</span><span class="o">.</span><span class="n">ecs</span><span class="o">.</span><span class="n">digdag</span><span class="o">-</span><span class="n">test</span><span class="o">.</span><span class="n">launch_type</span> <span class="o">=</span> <span class="n">FARGATE</span>
<span class="n">agent</span><span class="o">.</span><span class="n">command_executor</span><span class="o">.</span><span class="n">ecs</span><span class="o">.</span><span class="n">digdag</span><span class="o">-</span><span class="n">test</span><span class="o">.</span><span class="n">region</span> <span class="o">=</span> <span class="n">us</span><span class="o">-</span><span class="n">east</span><span class="o">-</span><span class="mi">1</span>
<span class="n">agent</span><span class="o">.</span><span class="n">command_executor</span><span class="o">.</span><span class="n">ecs</span><span class="o">.</span><span class="n">digdag</span><span class="o">-</span><span class="n">test</span><span class="o">.</span><span class="n">subnets</span> <span class="o">=</span> <span class="n">subnet</span><span class="o">-</span><span class="n">NNNNN</span>
<span class="n">agent</span><span class="o">.</span><span class="n">command_executor</span><span class="o">.</span><span class="n">ecs</span><span class="o">.</span><span class="n">digdag</span><span class="o">-</span><span class="n">test</span><span class="o">.</span><span class="n">max_retries</span> <span class="o">=</span> <span class="mi">3</span>
<span class="n">agent</span><span class="o">.</span><span class="n">command_executor</span><span class="o">.</span><span class="n">ecs</span><span class="o">.</span><span class="n">temporal_storage</span><span class="o">.</span><span class="n">type</span> <span class="o">=</span> <span class="n">s3</span>
<span class="n">agent</span><span class="o">.</span><span class="n">command_executor</span><span class="o">.</span><span class="n">ecs</span><span class="o">.</span><span class="n">temporal_storage</span><span class="o">.</span><span class="n">s3</span><span class="o">.</span><span class="n">bucket</span> <span class="o">=</span> <span class="o"><</span><span class="n">Bucket</span><span class="o">></span>
<span class="n">agent</span><span class="o">.</span><span class="n">command_executor</span><span class="o">.</span><span class="n">ecs</span><span class="o">.</span><span class="n">temporal_storage</span><span class="o">.</span><span class="n">s3</span><span class="o">.</span><span class="n">endpoint</span> <span class="o">=</span> <span class="n">s3</span><span class="o">.</span><span class="n">amazonaws</span><span class="o">.</span><span class="n">com</span>
<span class="n">agent</span><span class="o">.</span><span class="n">command_executor</span><span class="o">.</span><span class="n">ecs</span><span class="o">.</span><span class="n">temporal_storage</span><span class="o">.</span><span class="n">s3</span><span class="o">.</span><span class="n">credentials</span><span class="o">.</span><span class="n">access</span><span class="o">-</span><span class="n">key</span><span class="o">-</span><span class="nb">id</span> <span class="o">=</span> <span class="o"><</span><span class="n">ACCESS</span> <span class="n">KEY</span><span class="o">></span>
<span class="n">agent</span><span class="o">.</span><span class="n">command_executor</span><span class="o">.</span><span class="n">ecs</span><span class="o">.</span><span class="n">temporal_storage</span><span class="o">.</span><span class="n">s3</span><span class="o">.</span><span class="n">credentials</span><span class="o">.</span><span class="n">secret</span><span class="o">-</span><span class="n">access</span><span class="o">-</span><span class="n">key</span> <span class="o">=</span> <span class="o"><</span><span class="n">SECRET</span> <span class="n">KEY</span><span class="o">></span>
</pre></div>
</div>
<p>Each sub keys of <code class="docutils literal notranslate"><span class="pre">agent.command_executor</span></code> are as follows:</p>
<table border="1" class="docutils">
<thead>
<tr>
<th align="left">key</th>
<th align="left">description</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">ecs.name</td>
<td align="left">ECS Cluster name. The value <name> is used as the key of following configuration</td>
</tr>
<tr>
<td align="left">ecs.<name>.access_key_id</td>
<td align="left">(Optional)AWS access key for ECS. The key needs permissions for ECS and CloudWatch. If it is not specified, other credentials are used for authorization.</td>
</tr>
<tr>
<td align="left">ecs.<name>.secret_access_key</td>
<td align="left">(Optional)AWS secret key</td>
</tr>
<tr>
<td align="left">ecs.<name>.launch_type</td>
<td align="left">The launch type of container. <code>FARGATE</code> or <code>EC2</code></td>
</tr>
<tr>
<td align="left">ecs.<name>.region</td>
<td align="left">AWS region</td>
</tr>
<tr>
<td align="left">ecs.<name>.subnets</td>
<td align="left">AWS subnet</td>
</tr>
<tr>
<td align="left">ecs.<name>.max_retries</td>
<td align="left">Number of retry for AWS client</td>
</tr>
<tr>
<td align="left">ecs.<name>.use_environment_file</td>
<td align="left">(Optional) whether use environmentFiles or environment when setting variables to ECS. Default value is false</td>
</tr>
</tbody>
</table><p>Following keys are for configuration of temporal storage with AWS S3.</p>
<table border="1" class="docutils">
<thead>
<tr>
<th align="left">key</th>
<th align="left">description</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">ecs.temporal_storage.type</td>
<td align="left">The bucket type. <code>s3</code> for AWS S3</td>
</tr>
<tr>
<td align="left">ecs.temporal_storage.s3.bucket</td>
<td align="left">Bucket name</td>
</tr>
<tr>
<td align="left">ecs.temporal_storage.s3.endpoint</td>
<td align="left">The end point URL for S3</td>
</tr>
<tr>
<td align="left">ecs.temporal_storage.s3.credentials.access-key-id</td>
<td align="left">(Optional) AWS access key for the bucket</td>
</tr>
<tr>
<td align="left">ecs.temporal_storage.s3.credentials.secret-access-key</td>
<td align="left">(Optional) AWS secret key</td>
</tr>
</tbody>
</table><div class="section" id="the-ways-of-authorizing-to-ecs-cluster-tasks-and-s3-temporal-storage">
<h4>The ways of authorizing to ECS cluster, tasks and S3 temporal storage.<a class="headerlink" href="#the-ways-of-authorizing-to-ecs-cluster-tasks-and-s3-temporal-storage" title="Permalink to this headline">¶</a></h4>
<p><a class="reference external" href="https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/auth/DefaultAWSCredentialsProviderChain.html">DefaultAWSCredentialsProviderChain</a> besides AWS access key and secret can be used as a credential for connecting with ECS on version 0.10.5 or above . As a result of that, if <code class="docutils literal notranslate"><span class="pre">ecs.<name>.access_key_id</span></code> is not specified, digdag server looks for one of the credentials described in the document.
Digdag server uses the same credentials when connecting with S3 temporal storage, thus if <code class="docutils literal notranslate"><span class="pre">ecs.temporal_storage.s3.credentials.access-key-id</span></code> is not specified, digdag server also looks for credentials same as ECS.</p>
</div>
</div>
<div class="section" id="how-to-use-from-workflow">
<h3>How to use from workflow<a class="headerlink" href="#how-to-use-from-workflow" title="Permalink to this headline">¶</a></h3>
<p>In workflow definition, there are two ways to set a task on ECS.</p>
<div class="section" id="set-ecs-task-definition-arn">
<h4>Set <code class="docutils literal notranslate"><span class="pre">ecs.task_definition_arn</span></code><a class="headerlink" href="#set-ecs-task-definition-arn" title="Permalink to this headline">¶</a></h4>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">_export</span><span class="p">:</span>
<span class="n">ecs</span><span class="p">:</span>
<span class="n">task_definition_arn</span><span class="p">:</span> <span class="s2">"arn:aws:ecs:us-east-1:..."</span>
<span class="o">+</span><span class="n">task1</span><span class="p">:</span>
<span class="n">py</span><span class="o">></span><span class="p">:</span> <span class="o">...</span>
</pre></div>
</div>
</div>
<div class="section" id="set-docker-image">
<h4>Set <code class="docutils literal notranslate"><span class="pre">docker.image</span></code><a class="headerlink" href="#set-docker-image" title="Permalink to this headline">¶</a></h4>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">_export</span><span class="p">:</span>
<span class="n">docker</span><span class="p">:</span>
<span class="n">image</span><span class="p">:</span> <span class="s2">"digdag/digdag-python:3.7"</span>
<span class="o">+</span><span class="n">task1</span><span class="p">:</span>
<span class="n">py</span><span class="o">></span><span class="p">:</span> <span class="o">...</span>
</pre></div>
</div>
<p>You need to set a tag <code class="docutils literal notranslate"><span class="pre">digdag.docker.image</span></code> in the task definition.
ECS Command Executor try to search the tagged task definition.</p>
<p>(This way lists and check all task definitions until found and take long time to run the task. See issue <a class="reference external" href="https://github.com/treasure-data/digdag/issues/1488">#1488</a>)</p>
</div>
</div>
</div>
<div class="section" id="docker">
<h2>Docker<a class="headerlink" href="#docker" title="Permalink to this headline">¶</a></h2>
<div class="section" id="id1">
<h3>Setup<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h3>
<p>No configuration is required to use Docker Command Executor.</p>
</div>
<div class="section" id="id2">
<h3>How to use from workflow<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h3>
<p>The following is an example workflow definition for Docker Command Executor.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">_export</span><span class="p">:</span>
<span class="n">docker</span><span class="p">:</span>
<span class="n">image</span><span class="p">:</span> <span class="s2">"python:3.7"</span>
<span class="n">docker</span><span class="p">:</span> <span class="s2">"/usr/local/bin/docker"</span>
<span class="n">run_options</span><span class="p">:</span> <span class="p">[</span> <span class="s2">"-m"</span><span class="p">,</span> <span class="s2">"1G"</span> <span class="p">]</span>
<span class="n">pull_always</span><span class="p">:</span> <span class="n">true</span>
<span class="n">selinux</span><span class="p">:</span> <span class="n">true</span>
<span class="o">+</span><span class="n">task1</span><span class="p">:</span>
<span class="n">py</span><span class="o">></span><span class="p">:</span> <span class="o">...</span>
</pre></div>
</div>
<p>The sub keys in docker are as follows.</p>
<table border="1" class="docutils">
<thead>
<tr>
<th align="left">key</th>
<th align="left">description</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">image</td>
<td align="left">Docker image</td>
</tr>
<tr>
<td align="left">docker</td>
<td align="left">Docker command. default is <code>docker</code></td>
</tr>
<tr>
<td align="left">run_options</td>
<td align="left">Arguments to be passed to <code>docker run</code>1</td>
</tr>
<tr>
<td align="left">pull_always</td>
<td align="left">Digdag caches the docker image. If you want to pull the image always, set to <code>true</code>. Default is <code>false</code></td>
</tr>
<tr>
<td align="left">selinux</td>
<td align="left">Set to <code>true</code> when using SELinux. Default is <code>false</code></td>
</tr>
</tbody>
</table><p>You can build a docker image to be used with <code class="docutils literal notranslate"><span class="pre">build</span></code> parameter.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">_export</span><span class="p">:</span>
<span class="n">docker</span><span class="p">:</span>
<span class="n">image</span><span class="p">:</span> <span class="s2">"azul/zulu-openjdk:8"</span>
<span class="n">docker</span><span class="p">:</span> <span class="s2">"/usr/local/bin/docker"</span>
<span class="n">run_options</span><span class="p">:</span> <span class="p">[</span> <span class="s2">"-m"</span><span class="p">,</span> <span class="s2">"1G"</span> <span class="p">]</span>
<span class="n">build</span><span class="p">:</span>
<span class="o">-</span> <span class="n">apt</span><span class="o">-</span><span class="n">get</span> <span class="o">-</span><span class="n">y</span> <span class="n">update</span>
<span class="o">-</span> <span class="n">apt</span><span class="o">-</span><span class="n">get</span> <span class="o">-</span><span class="n">y</span> <span class="n">install</span> <span class="n">software</span><span class="o">-</span><span class="n">properties</span><span class="o">-</span><span class="n">common</span>
<span class="n">build_options</span><span class="p">:</span>
<span class="o">-</span> <span class="o">--</span><span class="n">build</span><span class="o">-</span><span class="n">arg</span> <span class="n">var1</span><span class="o">=</span><span class="n">test1</span>
<span class="o">+</span><span class="n">task1</span><span class="p">:</span>
<span class="n">py</span><span class="o">></span><span class="p">:</span> <span class="o">...</span>
</pre></div>
</div>
<p>Docker Command Executor generates a Dockerfile and build an image then run a container with the image.</p>
<table border="1" class="docutils">
<thead>
<tr>
<th align="left">key</th>
<th align="left">description</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">image</td>
<td align="left">Base image in the generated Dockerfile</td>
</tr>
<tr>
<td align="left">build</td>
<td align="left">Command list which are described in the generated Dockerfile with <code>RUN</code></td>
</tr>
<tr>
<td align="left">build_options</td>
<td align="left">Option list for <code>docker build</code> command</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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