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| <h1>Starting an Ozone Cluster</h1> |
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| <p>Before we boot up the Ozone cluster, we need to initialize both SCM and Ozone Manager.</p> |
| <p><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>ozone scm -init</span></span></code></pre></div> |
| This allows SCM to create the cluster Identity and initialize its state. |
| The <code>init</code> command is similar to Namenode format. Init command is executed only once, that allows SCM to create all the required on-disk structures to work correctly. |
| <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>ozone --daemon start scm</span></span></code></pre></div></p> |
| <p>Once we know SCM is up and running, we can create an Object Store for our use. This is done by running the following command.</p> |
| <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>ozone om -createObjectStore</span></span></code></pre></div> |
| <p>Once Ozone manager has created the Object Store, we are ready to run the name |
| services.</p> |
| <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>ozone --daemon start om</span></span></code></pre></div> |
| <p>At this point Ozone’s name services, the Ozone manager, and the block service SCM is both running. |
| <strong>Please note</strong>: If SCM is not running |
| <code>createObjectStore</code> command will fail. SCM start will fail if on-disk data structures are missing. So please make sure you have done both <code>init</code> and <code>createObjectStore</code> commands.</p> |
| <p>Now we need to start the data nodes. Please run the following command on each datanode. |
| <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>ozone --daemon start datanode</span></span></code></pre></div></p> |
| <p>At this point SCM, Ozone Manager and data nodes are up and running.</p> |
| <p><em><strong>Congratulations!, You have set up a functional ozone cluster.</strong></em></p> |
| <hr> |
| <p>If you want to make your life simpler, you can just run |
| <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>ozone scm -init |
| </span></span><span style="display:flex;"><span>ozone om -createObjectStore |
| </span></span><span style="display:flex;"><span>start-ozone.sh</span></span></code></pre></div> |
| This assumes that you have set up the slaves file correctly and ssh |
| configuration that allows ssh-ing to all data nodes. This is the same as the |
| HDFS configuration, so please refer to HDFS documentation on how to set this |
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