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| <main class="article default-main full-800" data-ceiling="topbar"> |
| <div class="article-banner"> |
| <p>You are viewing the documentation for a prerelease version.</p> |
| </div> |
| <div class="article-header"> |
| <nav class="crumbs" aria-label="breadcrumbs"> |
| <ul> |
| <li class="crumb">Cassandra</li> |
| <li class="crumb"><a href="index.html">Getting Started</a></li> |
| <li class="crumb"><a href="configuring.html">Configuring Cassandra</a></li> |
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| </div> |
| <article class="doc"> |
| <h1 class="page">Configuring Cassandra</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The <code>Cassandra</code> configuration files location varies, depending on the |
| type of installation:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>docker: <code>/etc/cassandra</code> directory</p> |
| </li> |
| <li> |
| <p>tarball: <code>conf</code> directory within the tarball install location</p> |
| </li> |
| <li> |
| <p>package: <code>/etc/cassandra</code> directory</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Cassandra’s default configuration file, <code>cassandra.yaml</code>, is sufficient |
| to explore a simple single-node <code>cluster</code>. However, anything beyond |
| running a single-node cluster locally requires additional configuration |
| to various Cassandra configuration files. Some examples that require |
| non-default configuration are deploying a multi-node cluster or using |
| clients that are not running on a cluster node.</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>cassandra.yaml</code>: the main configuration file for Cassandra</p> |
| </li> |
| <li> |
| <p><code>cassandra-env.sh</code>: environment variables can be set</p> |
| </li> |
| <li> |
| <p><code>cassandra-rackdc.properties</code> OR <code>cassandra-topology.properties</code>: set |
| rack and datacenter information for a cluster</p> |
| </li> |
| <li> |
| <p><code>logback.xml</code>: logging configuration including logging levels</p> |
| </li> |
| <li> |
| <p><code>jvm-*</code>: a number of JVM configuration files for both the server and |
| clients</p> |
| </li> |
| <li> |
| <p><code>commitlog_archiving.properties</code>: set archiving parameters for the |
| <code>commitlog</code></p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>The sample configuration files can also be found in <code>./conf</code>:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>cqlshrc.sample</code>: how the CQL shell, cqlsh, can be configured</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="main-runtime-properties"><a class="anchor" href="#main-runtime-properties"></a>Main runtime properties</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Configuring Cassandra is done by setting yaml properties in the |
| <code>cassandra.yaml</code> file. At a minimum you should consider setting the |
| following properties:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>cluster_name</code>: Set the name of your cluster.</p> |
| </li> |
| <li> |
| <p><code>seeds</code>: A comma separated list of the IP addresses of your cluster |
| <code>seed nodes</code>.</p> |
| </li> |
| <li> |
| <p><code>storage_port</code>: Check that you don’t have the default port of 7000 |
| blocked by a firewall.</p> |
| </li> |
| <li> |
| <p><code>listen_address</code>: The <code>listen address</code> is the IP address of a node |
| that allows it to communicate with other nodes in the cluster. Set to |
| <span class="title-ref">localhost</span> by default. Alternatively, you can set |
| <code>listen_interface</code> to tell Cassandra which interface to use, and |
| consecutively which address to use. Set one property, not both.</p> |
| </li> |
| <li> |
| <p><code>native_transport_port</code>: Check that you don’t have the default port of |
| 9042 blocked by a firewall, so that clients like cqlsh can communicate |
| with Cassandra on this port.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="changing-the-location-of-directories"><a class="anchor" href="#changing-the-location-of-directories"></a>Changing the location of directories</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The following yaml properties control the location of directories:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>data_file_directories</code>: One or more directories where data files, |
| like <code>SSTables</code> are located.</p> |
| </li> |
| <li> |
| <p><code>commitlog_directory</code>: The directory where commitlog files are |
| located.</p> |
| </li> |
| <li> |
| <p><code>saved_caches_directory</code>: The directory where saved caches are |
| located.</p> |
| </li> |
| <li> |
| <p><code>hints_directory</code>: The directory where <code>hints</code> are located.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>For performance reasons, if you have multiple disks, consider putting |
| commitlog and data files on different disks.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="environment-variables"><a class="anchor" href="#environment-variables"></a>Environment variables</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>JVM-level settings such as heap size can be set in <code>cassandra-env.sh</code>. |
| You can add any additional JVM command line argument to the <code>JVM_OPTS</code> |
| environment variable; when Cassandra starts, these arguments will be |
| passed to the JVM.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="logging"><a class="anchor" href="#logging"></a>Logging</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The default logger is <span class="title-ref">logback</span>. By default it will log:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><strong>INFO</strong> level in <code>system.log</code></p> |
| </li> |
| <li> |
| <p><strong>DEBUG</strong> level in <code>debug.log</code></p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>When running in the foreground, it will also log at INFO level to the |
| console. You can change logging properties by editing <code>logback.xml</code> or |
| by running the <span class="title-ref">nodetool setlogginglevel</span> command.</p> |
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