<section>
 <h1 class="contains-headerlink leafygreen-ui-41fr9s" weight="medium">
  rs.addArb()
  <a class="headerlink leafygreen-ui-1kepx47" href="#rs.addarb--" title="Permalink to this heading">
   <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
    <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
    </path>
    <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
    </path>
   </svg>
   <div class="css-1btu0w3 evvkmar0" id="rs.addarb--">
   </div>
  </a>
 </h1>
 <div class="leafygreen-ui-a5yxub">
  <p class="css-1cmx2d4 ef7gu8j0">
   On this page
  </p>
  <ul class="css-1qb0mst ef7gu8j1">
   <li class="leafygreen-ui-1e7a0ei">
    <a class="lg-ui-0001 leafygreen-ui-e98ikf" href="#description" target="_self">
     <span>
      Description
     </span>
    </a>
   </li>
   <li class="leafygreen-ui-1jqtqlb">
    <a class="lg-ui-0001 leafygreen-ui-cpmeq5" href="#ip-binding" target="_self">
     <span>
      IP Binding
     </span>
    </a>
   </li>
  </ul>
 </div>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   Description
   <a class="headerlink leafygreen-ui-1kepx47" href="#description" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
     <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="description">
    </div>
   </a>
  </h2>
  <dl class="method">
   <dt>
    <code class="leafygreen-ui-1l06pbn">
     rs.addArb(host)
    </code>
    <a class="headerlink leafygreen-ui-1kepx47" href="#mongodb-method-rs.addArb" title="Permalink to this definition">
     <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
      <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
      </path>
      <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
      </path>
     </svg>
     <div class="css-1btu0w3 evvkmar0" id="mongodb-method-rs.addArb">
     </div>
    </a>
   </dt>
   <dd>
    <p class="leafygreen-ui-1kp3ins">
     Adds a new
     <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/glossary/#std-term-arbiter">
      arbiter
     </a>
     to an existing replica set.
    </p>
    <p class="leafygreen-ui-1kp3ins">
     <code class="leafygreen-ui-1l06pbn">
      rs.add(&lt;host&gt;, true)
     </code>
     is functionally the same as
     <code class="leafygreen-ui-1l06pbn">
      rs.addArb(&lt;host&gt;)
     </code>
     . You can use these commands interchangeably.
    </p>
    <div class="leafygreen-ui-1sjx7ru" role="note">
     <h2 class="leafygreen-ui-29m78u">
      Warning
     </h2>
     <div class="leafygreen-ui-9mycqc">
      <p class="leafygreen-ui-1kp3ins">
       Avoid deploying more than one
       <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/glossary/#std-term-arbiter">
        arbiter
       </a>
       in a
       <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/glossary/#std-term-replica-set">
        replica set
       </a>
       . See
       <a class="leafygreen-ui-tqgtui" href="/docs/manual/core/replica-set-arbiter/#std-label-rollbacks-multi-arbiters">
        Concerns with Multiple Arbiters
        <!-- -->
        .
       </a>
      </p>
     </div>
    </div>
    <p class="leafygreen-ui-1kp3ins">
     To add an arbiter to an existing replica set:
    </p>
    <ul class="leafygreen-ui-rioki0">
     <li class="leafygreen-ui-d7p7b6">
      <p class="leafygreen-ui-1kp3ins">
       Typically, if there are two or fewer data-bearing members in the
replica set, you might need to first set the
       <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/command/setDefaultRWConcern/#std-label-set_global_default_write_concern">
        cluster wide write
concern
       </a>
       for the replica set.
      </p>
     </li>
     <li class="leafygreen-ui-d7p7b6">
      <p class="leafygreen-ui-1kp3ins">
       See
       <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/command/setDefaultRWConcern/#std-label-set_global_default_write_concern">
        cluster wide write concern
       </a>
       for more information on why you
might need to set the cluster wide write concern.
      </p>
     </li>
    </ul>
    <p class="leafygreen-ui-1kp3ins">
     You do not need to change the cluster wide write concern before starting
a new replica set with an arbiter.
    </p>
    <div class="leafygreen-ui-13vw3ie" role="note">
     <h2 class="leafygreen-ui-1fn4p2b">
      Tip
     </h2>
     <h3 class="leafygreen-ui-144d5kf">
      <strong>
       See also:
      </strong>
     </h3>
     <div class="leafygreen-ui-9mycqc">
      <p class="leafygreen-ui-1kp3ins">
       <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/mongodb-defaults/#std-label-default-wc-formula">
        Default write concern formula
       </a>
      </p>
     </div>
    </div>
    <p class="leafygreen-ui-1kp3ins">
     The
     <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="#mongodb-method-rs.addArb" target="_self">
      <span>
       <code class="leafygreen-ui-1l06pbn">
        rs.addArb()
       </code>
      </span>
     </a>
     method takes the following parameter:
    </p>
    <div class="leafygreen-ui-skkc39" tabindex="0">
     <table class="leafygreen-ui-hr8lsv">
      <colgroup>
       <col style="width:20%"/>
       <col style="width:20%"/>
       <col style="width:80%"/>
      </colgroup>
      <thead class="leafygreen-ui-a9ho40">
       <tr data-testid="leafygreen-ui-header-row">
        <th class="leafygreen-ui-1trtg6r" role="columnheader" scope="col">
         <div class="leafygreen-ui-ui0te9">
          <div>
           Parameter
          </div>
         </div>
        </th>
        <th class="leafygreen-ui-13uteka" role="columnheader" scope="col">
         <div class="leafygreen-ui-ui0te9">
          <div>
           Type
          </div>
         </div>
        </th>
        <th class="leafygreen-ui-13uteka" role="columnheader" scope="col">
         <div class="leafygreen-ui-ui0te9">
          <div>
           Description
          </div>
         </div>
        </th>
       </tr>
      </thead>
      <tbody>
       <tr class="">
        <td class="leafygreen-ui-1drjk7h">
         <div class="leafygreen-ui-1n4j8xf">
          <div>
           <code class="leafygreen-ui-1l06pbn">
            host
           </code>
          </div>
         </div>
        </td>
        <td class="leafygreen-ui-1drjk7h">
         <div class="leafygreen-ui-1n4j8xf">
          <div>
           string
          </div>
         </div>
        </td>
        <td class="leafygreen-ui-1drjk7h">
         <div class="leafygreen-ui-1n4j8xf">
          <div>
           Specifies the hostname and optionally the port number of the arbiter
member to add to replica set.
          </div>
         </div>
        </td>
       </tr>
      </tbody>
     </table>
    </div>
   </dd>
  </dl>
 </section>
 <section>
  <h2 class="contains-headerlink leafygreen-ui-19f71ei" weight="medium">
   IP Binding
   <a class="headerlink leafygreen-ui-1kepx47" href="#ip-binding" title="Permalink to this heading">
    <svg aria-label="Link Icon" class="leafygreen-ui-a30zj9" fill="none" height="12" role="img" viewbox="0 0 16 16" width="12" xmlns="http://www.w3.org/2000/svg">
     <path d="M6.039 9.953a3.596 3.596 0 0 1-.327-.38l1.45-1.445a1.553 1.553 0 0 0 2.496.423l2.885-2.87a1.57 1.57 0 0 0 .01-2.213 1.553 1.553 0 0 0-2.203-.01l-.379.377A.995.995 0 0 1 8.56 3.83a1.005 1.005 0 0 1 .006-1.418l.38-.377a3.542 3.542 0 0 1 5.024.023 3.58 3.58 0 0 1-.022 5.047l-2.884 2.871a3.542 3.542 0 0 1-5.025-.022Z" fill="currentColor">
     </path>
     <path d="M9.961 6.047c.12.12.228.248.327.38l-1.45 1.445a1.553 1.553 0 0 0-2.496-.423l-2.885 2.87a1.57 1.57 0 0 0-.01 2.213 1.553 1.553 0 0 0 2.203.01l.379-.377a.995.995 0 0 1 1.411.006 1.005 1.005 0 0 1-.006 1.418l-.38.377a3.542 3.542 0 0 1-5.024-.023 3.58 3.58 0 0 1 .022-5.047l2.884-2.871a3.542 3.542 0 0 1 5.025.022Z" fill="currentColor">
     </path>
    </svg>
    <div class="css-1btu0w3 evvkmar0" id="ip-binding">
    </div>
   </a>
  </h2>
  <div class="leafygreen-ui-1sjx7ru" role="note">
   <h2 class="leafygreen-ui-29m78u">
    Warning
   </h2>
   <div class="leafygreen-ui-9mycqc">
    <p class="leafygreen-ui-1kp3ins">
     Before you bind your instance to a publicly-accessible IP address,
you must secure your cluster from unauthorized access. For a complete
list of security recommendations, see
     <a class="leafygreen-ui-tqgtui" href="/docs/manual/administration/security-checklist/#std-label-security-checklist">
      Security Checklist for Self-Managed Deployments
     </a>
     . At minimum, consider
     <a class="leafygreen-ui-tqgtui" href="/docs/manual/administration/security-checklist/#std-label-checklist-auth">
      enabling authentication
     </a>
     and
     <a class="leafygreen-ui-tqgtui" href="/docs/manual/core/security-hardening/#std-label-network-config-hardening">
      hardening
network infrastructure
      <!-- -->
      .
     </a>
    </p>
   </div>
  </div>
  <p class="leafygreen-ui-1kp3ins">
   MongoDB binaries,
   <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/program/mongod/#mongodb-binary-bin.mongod">
    <code class="leafygreen-ui-1l06pbn">
     mongod
    </code>
   </a>
   and
   <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/program/mongos/#mongodb-binary-bin.mongos">
    <code class="leafygreen-ui-1l06pbn">
     mongos
    </code>
   </a>
   , bind
to localhost by default. If the
   <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/configuration-options/#mongodb-setting-net.ipv6">
    <code class="leafygreen-ui-1l06pbn">
     net.ipv6
    </code>
   </a>
   configuration file
setting or the
   <code class="leafygreen-ui-1l06pbn">
    --ipv6
   </code>
   command line option is set for the binary,
the binary additionally binds to the localhost IPv6 address.
  </p>
  <p class="leafygreen-ui-1kp3ins">
   By default
   <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/program/mongod/#mongodb-binary-bin.mongod">
    <code class="leafygreen-ui-1l06pbn">
     mongod
    </code>
   </a>
   and
   <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/program/mongos/#mongodb-binary-bin.mongos">
    <code class="leafygreen-ui-1l06pbn">
     mongos
    </code>
   </a>
   that are
bound to localhost only accept connections from clients that are
running on the same computer. This binding behavior includes
   <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="https://www.mongodb.com/docs/mongodb-shell/#mongodb-binary-bin.mongosh" target="_self">
    <span>
     <code class="leafygreen-ui-1l06pbn">
      mongosh
     </code>
    </span>
   </a>
   and other members of your replica set or sharded
cluster. Remote clients cannot connect to binaries that are bound only
to localhost.
  </p>
  <p class="leafygreen-ui-1kp3ins">
   To override the default binding and bind to other IP addresses, use the
   <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/configuration-options/#mongodb-setting-net.bindIp">
    <code class="leafygreen-ui-1l06pbn">
     net.bindIp
    </code>
   </a>
   configuration file setting or the
   <code class="leafygreen-ui-1l06pbn">
    --bind_ip
   </code>
   command-line option to specify a list of hostnames or IP addresses.
  </p>
  <div class="leafygreen-ui-1sjx7ru" role="note">
   <h2 class="leafygreen-ui-29m78u">
    Warning
   </h2>
   <div class="leafygreen-ui-9mycqc">
    <p class="leafygreen-ui-1kp3ins">
     Starting in MongDB 5.0,
     <a class="lg-ui-0001 leafygreen-ui-fgcsv5" href="https://en.wikipedia.org/wiki/Split-horizon_DNS" rel="noopener noreferrer">
      <span>
       split horizon DNS
      </span>
      <svg alt="" aria-hidden="true" class="leafygreen-ui-1ie5kuq" height="16" role="presentation" viewbox="0 0 16 16" width="16">
       <path d="M13.823 2.4491C13.8201 2.30008 13.6999 2.17994 13.5509 2.17704L9.5062 2.09836C9.25654 2.09351 9.12821 2.39519 9.30482 2.5718L10.3856 3.65257L7.93433 6.10383C7.87964 6.15852 7.83047 6.21665 7.78683 6.27752L5.99909 8.06525C5.46457 8.59977 5.46457 9.4664 5.99909 10.0009C6.53361 10.5354 7.40023 10.5354 7.93475 10.0009L9.72249 8.21317C9.78336 8.16953 9.84148 8.12037 9.89618 8.06567L12.3474 5.61441L13.4282 6.69518C13.6048 6.87179 13.9065 6.74347 13.9016 6.4938L13.823 2.4491Z" fill="currentColor">
       </path>
       <path d="M7.25 3.12893C7.66421 3.12893 8 3.46472 8 3.87893C8 4.29315 7.66421 4.62893 7.25 4.62893H4C3.72386 4.62893 3.5 4.85279 3.5 5.12893V11.9929C3.5 12.2691 3.72386 12.4929 4 12.4929H10.864C11.1401 12.4929 11.364 12.2691 11.364 11.9929V8.75C11.364 8.33579 11.6998 8 12.114 8C12.5282 8 12.864 8.33579 12.864 8.75V11.9929C12.864 13.0975 11.9686 13.9929 10.864 13.9929H4C2.89543 13.9929 2 13.0975 2 11.9929V5.12893C2 4.02436 2.89543 3.12893 4 3.12893H7.25Z" fill="currentColor">
       </path>
      </svg>
     </a>
     nodes that are
only configured with an IP address fail startup validation and
report an error. See
     <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/parameters/#mongodb-parameter-param.disableSplitHorizonIPCheck">
      <code class="leafygreen-ui-1l06pbn">
       disableSplitHorizonIPCheck
      </code>
      .
     </a>
    </p>
   </div>
  </div>
  <p class="leafygreen-ui-1kp3ins">
   For example, the following
   <a class="leafygreen-ui-tqgtui" href="/docs/manual/reference/program/mongod/#mongodb-binary-bin.mongod">
    <code class="leafygreen-ui-1l06pbn">
     mongod
    </code>
   </a>
   instance binds to both
the localhost and the hostname
   <code class="leafygreen-ui-1l06pbn">
    My-Example-Associated-Hostname
   </code>
   , which is
associated with the IP address
   <code class="leafygreen-ui-1l06pbn">
    198.51.100.1
   </code>
   :
  </p>
  <script class="structured_data" type="application/ld+json">
   {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"mongod --bind_ip localhost,My-Example-Associated-Hostname"}
  </script>
  <div class="css-16lmvu9">
   <div class="leafygreen-ui-196mwvg">
    <div class="leafygreen-ui-yzcs8i">
     <pre class="leafygreen-ui-1q4bxgx" tabindex="-1"><code class="lg-highlight-hljs-light none leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">mongod --bind_ip localhost,My-Example-Associated-Hostname</td></tr></tbody></table></code></pre>
     <div class="leafygreen-ui-1bqcprk" data-testid="leafygreen-code-panel">
      <button aria-disabled="false" aria-label="Copy" class="leafygreen-ui-1c6zwke" data-testid="code_copy-button" tabindex="0">
       <div class="leafygreen-ui-xhlipt">
        <svg aria-label="Copy Icon" class="leafygreen-ui-1st74h4" height="16" role="img" viewbox="0 0 16 16" width="16">
         <path clip-rule="evenodd" d="M1 5.71428V10.2857C1 11.2325 1.76751 12 2.71429 12H5.75V7.10957C5.75 6.54414 5.97724 6.00244 6.38065 5.60623L8.67403 3.35381C8.77447 3.25516 8.88376 3.16757 9 3.09182V2.71429C9 1.76751 8.23249 1 7.28571 1H5.8V4.42857C5.8 5.13865 5.22437 5.71428 4.51429 5.71428H1ZM9 4.78571L7.25654 6.49804C7.24689 6.50752 7.23749 6.5172 7.22834 6.52708C7.22208 6.53383 7.21594 6.54068 7.20991 6.54762C7.07504 6.70295 7 6.90234 7 7.10957V7.79762H9H10.0095C10.4829 7.79762 10.8667 7.41386 10.8667 6.94047V4H10.1505C9.92587 4 9.7102 4.0882 9.54992 4.24562L9 4.78571ZM4.86667 1H4.15053C3.92587 1 3.7102 1.0882 3.54992 1.24562L1.25654 3.49804C1.09244 3.65921 1 3.87957 1 4.10957V4.79762H4.00952C4.48291 4.79762 4.86667 4.41386 4.86667 3.94047V1ZM7 12V8.71428H9H10.5143C11.2244 8.71428 11.8 8.13865 11.8 7.42857V4H13.2857C14.2325 4 15 4.76751 15 5.71429V13.2857C15 14.2325 14.2325 15 13.2857 15H8.71429C7.76751 15 7 14.2325 7 13.2857V12Z" fill="currentColor" fill-rule="evenodd">
         </path>
        </svg>
       </div>
      </button>
     </div>
    </div>
   </div>
  </div>
  <p class="leafygreen-ui-1kp3ins">
   In order to connect to this instance, remote clients must specify
the hostname  or its associated IP address
   <code class="leafygreen-ui-1l06pbn">
    198.51.100.1
   </code>
   :
  </p>
  <script class="structured_data" type="application/ld+json">
   {"@context":"https://schema.org","@type":"SoftwareSourceCode","codeSampleType":"code snippet","text":"mongosh --host My-Example-Associated-Hostname\n\nmongosh --host 198.51.100.1"}
  </script>
  <div class="css-16lmvu9">
   <div class="leafygreen-ui-196mwvg">
    <div class="leafygreen-ui-yzcs8i">
     <pre class="leafygreen-ui-11itue3" tabindex="-1"><code class="lg-highlight-hljs-light none leafygreen-ui-9ybzas"><table class="leafygreen-ui-1tr4g10"><tbody><tr class=""><td class="leafygreen-ui-7razhx">mongosh --host My-Example-Associated-Hostname</td></tr><tr class=""><td class="leafygreen-ui-7razhx"><div class="leafygreen-ui-ihxujy"></div></td></tr><tr class=""><td class="leafygreen-ui-7razhx">mongosh --host 198.51.100.1</td></tr></tbody></table></code></pre>
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  <div class="leafygreen-ui-85da11" role="note">
   <h2 class="leafygreen-ui-1ac4g5h">
    Important
   </h2>
   <div class="leafygreen-ui-9mycqc">
    <p class="leafygreen-ui-1kp3ins">
     To avoid configuration updates due to IP address changes, use DNS
hostnames instead of IP addresses. It is particularly important to
use a DNS hostname instead of an IP address when configuring replica
set members or sharded cluster members.
    </p>
    <p class="leafygreen-ui-1kp3ins">
     Use hostnames instead of IP addresses to configure clusters across a
split network horizon. Starting in MongoDB 5.0, nodes that are only
configured with an IP address fail startup validation and do not start.
    </p>
   </div>
  </div>
 </section>
</section>
