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  <div class="section" id="installing-cassandra">
<h1>Installing Cassandra<a class="headerlink" href="#installing-cassandra" title="Permalink to this headline">¶</a></h1>
<div class="section" id="prerequisites">
<h2>Prerequisites<a class="headerlink" href="#prerequisites" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>The latest version of Java 8, either the <a class="reference external" href="http://www.oracle.com/technetwork/java/javase/downloads/index.html">Oracle Java Standard Edition 8</a> or <a class="reference external" href="http://openjdk.java.net/">OpenJDK 8</a>. To
verify that you have the correct version of java installed, type <code class="docutils literal notranslate"><span class="pre">java</span> <span class="pre">-version</span></code>.</li>
<li>For using cqlsh, the latest version of <a class="reference external" href="https://www.python.org/downloads/">Python 2.7</a>. To verify that you have
the correct version of Python installed, type <code class="docutils literal notranslate"><span class="pre">python</span> <span class="pre">--version</span></code>.</li>
</ul>
</div>
<div class="section" id="installation-from-binary-tarball-files">
<h2>Installation from binary tarball files<a class="headerlink" href="#installation-from-binary-tarball-files" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Download the latest stable release from the <a class="reference external" href="http://cassandra.apache.org/download/">Apache Cassandra downloads website</a>.</li>
<li>Untar the file somewhere, for example:</li>
</ul>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>tar -xzvf apache-cassandra-3.6-bin.tar.gz
</pre></div>
</div>
<p>The files will be extracted into <code class="docutils literal notranslate"><span class="pre">apache-cassandra-3.6</span></code>, you need to substitute 3.6 with the release number that you
have downloaded.</p>
<ul class="simple">
<li>Optionally add <code class="docutils literal notranslate"><span class="pre">apache-cassandra-3.6\bin</span></code> to your path.</li>
<li>Start Cassandra in the foreground by invoking <code class="docutils literal notranslate"><span class="pre">bin/cassandra</span> <span class="pre">-f</span></code> from the command line. Press “Control-C” to stop
Cassandra. Start Cassandra in the background by invoking <code class="docutils literal notranslate"><span class="pre">bin/cassandra</span></code> from the command line. Invoke <code class="docutils literal notranslate"><span class="pre">kill</span> <span class="pre">pid</span></code>
or <code class="docutils literal notranslate"><span class="pre">pkill</span> <span class="pre">-f</span> <span class="pre">CassandraDaemon</span></code> to stop Cassandra, where pid is the Cassandra process id, which you can find for
example by invoking <code class="docutils literal notranslate"><span class="pre">pgrep</span> <span class="pre">-f</span> <span class="pre">CassandraDaemon</span></code>.</li>
<li>Verify that Cassandra is running by invoking <code class="docutils literal notranslate"><span class="pre">bin/nodetool</span> <span class="pre">status</span></code> from the command line.</li>
<li>Configuration files are located in the <code class="docutils literal notranslate"><span class="pre">conf</span></code> sub-directory.</li>
<li>Since Cassandra 2.1, log and data directories are located in the <code class="docutils literal notranslate"><span class="pre">logs</span></code> and <code class="docutils literal notranslate"><span class="pre">data</span></code> sub-directories respectively.
Older versions defaulted to <code class="docutils literal notranslate"><span class="pre">/var/log/cassandra</span></code> and <code class="docutils literal notranslate"><span class="pre">/var/lib/cassandra</span></code>. Due to this, it is necessary to either
start Cassandra with root privileges or change <code class="docutils literal notranslate"><span class="pre">conf/cassandra.yaml</span></code> to use directories owned by the current user,
as explained below in the section on changing the location of directories.</li>
</ul>
</div>
<div class="section" id="installation-from-debian-packages">
<h2>Installation from Debian packages<a class="headerlink" href="#installation-from-debian-packages" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Add the Apache repository of Cassandra to <code class="docutils literal notranslate"><span class="pre">/etc/apt/sources.list.d/cassandra.sources.list</span></code>, for example for version
3.6:</li>
</ul>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>echo &quot;deb http://www.apache.org/dist/cassandra/debian 36x main&quot; | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list
</pre></div>
</div>
<ul class="simple">
<li>Add the Apache Cassandra repository keys:</li>
</ul>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>curl https://www.apache.org/dist/cassandra/KEYS | sudo apt-key add -
</pre></div>
</div>
<ul class="simple">
<li>Update the repositories:</li>
</ul>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>sudo apt-get update
</pre></div>
</div>
<ul class="simple">
<li>If you encounter this error:</li>
</ul>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>GPG error: http://www.apache.org 36x InRelease: The following signatures couldn&#39;t be verified because the public key is not available: NO_PUBKEY A278B781FE4B2BDA
</pre></div>
</div>
<p>Then add the public key A278B781FE4B2BDA as follows:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>sudo apt-key adv --keyserver pool.sks-keyservers.net --recv-key A278B781FE4B2BDA
</pre></div>
</div>
<p>and repeat <code class="docutils literal notranslate"><span class="pre">sudo</span> <span class="pre">apt-get</span> <span class="pre">update</span></code>. The actual key may be different, you get it from the error message itself. For a
full list of Apache contributors public keys, you can refer to <a class="reference external" href="https://www.apache.org/dist/cassandra/KEYS">this link</a>.</p>
<ul class="simple">
<li>Install Cassandra:</li>
</ul>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>sudo apt-get install cassandra
</pre></div>
</div>
<ul class="simple">
<li>You can start Cassandra with <code class="docutils literal notranslate"><span class="pre">sudo</span> <span class="pre">service</span> <span class="pre">cassandra</span> <span class="pre">start</span></code> and stop it with <code class="docutils literal notranslate"><span class="pre">sudo</span> <span class="pre">service</span> <span class="pre">cassandra</span> <span class="pre">stop</span></code>.
However, normally the service will start automatically. For this reason be sure to stop it if you need to make any
configuration changes.</li>
<li>Verify that Cassandra is running by invoking <code class="docutils literal notranslate"><span class="pre">nodetool</span> <span class="pre">status</span></code> from the command line.</li>
<li>The default location of configuration files is <code class="docutils literal notranslate"><span class="pre">/etc/cassandra</span></code>.</li>
<li>The default location of log and data directories is <code class="docutils literal notranslate"><span class="pre">/var/log/cassandra/</span></code> and <code class="docutils literal notranslate"><span class="pre">/var/lib/cassandra</span></code>.</li>
</ul>
</div>
</div>


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