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  <section id="required-command-line-arguments">
<span id="users-guide-command-line"></span><h1>Required command line arguments<a class="headerlink" href="#required-command-line-arguments" title="Link to this heading">¶</a></h1>
<p>There a two command line arguments you have to set when starting Varnish, these are:</p>
<ul class="simple">
<li><p>what TCP port to serve HTTP from, and</p></li>
<li><p>where the backend server can be contacted.</p></li>
</ul>
<p>If you have installed Varnish through using a provided operating system bound package,
you will find the startup options here:</p>
<ul class="simple">
<li><p>Debian, Ubuntu: <cite>/etc/default/varnish</cite></p></li>
<li><p>Red Hat, Centos: <cite>/etc/sysconfig/varnish</cite></p></li>
<li><p>FreeBSD: <cite>/etc/rc.conf</cite> (See also: /usr/local/etc/rc.d/varnishd)</p></li>
</ul>
<section id="a-listen-address">
<h2>‘-a’ <em>listen_address</em><a class="headerlink" href="#a-listen-address" title="Link to this heading">¶</a></h2>
<p>The ‘-a’ argument defines what address Varnish should listen to, and service HTTP requests from.</p>
<p>You will most likely want to set this to “:80” which is the Well
Known Port for HTTP.</p>
<p>You can specify multiple addresses separated by a comma, and you
can use numeric or host/service names if you like, Varnish will try
to open and service as many of them as possible, but if none of them
can be opened, <cite>varnishd</cite> will not start.</p>
<p>Here are some examples:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">-</span><span class="n">a</span> <span class="p">:</span><span class="mi">80</span>
<span class="o">-</span><span class="n">a</span> <span class="n">localhost</span><span class="p">:</span><span class="mi">80</span>
<span class="o">-</span><span class="n">a</span> <span class="mf">192.168.1.100</span><span class="p">:</span><span class="mi">8080</span>
<span class="o">-</span><span class="n">a</span> <span class="s1">&#39;[fe80::1]:80&#39;</span>
<span class="o">-</span><span class="n">a</span> <span class="s1">&#39;0.0.0.0:8080,[::]:8081&#39;</span>
</pre></div>
</div>
<p>If your webserver runs on the same machine, you will have to move
it to another port number first.</p>
</section>
<section id="f-vcl-file-or-b-backend">
<h2>‘-f’ <em>VCL-file</em> or ‘-b’ <em>backend</em><a class="headerlink" href="#f-vcl-file-or-b-backend" title="Link to this heading">¶</a></h2>
<p>Varnish needs to know where to find the HTTP server it is caching for.
You can either specify it with the ‘-b’ argument, or you can put it in your own VCL file, specified with the ‘-f’ argument.</p>
<p>Using ‘-b’ is a quick way to get started:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">-</span><span class="n">b</span> <span class="n">localhost</span><span class="p">:</span><span class="mi">81</span>
<span class="o">-</span><span class="n">b</span> <span class="n">thatotherserver</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span><span class="p">:</span><span class="mi">80</span>
<span class="o">-</span><span class="n">b</span> <span class="mf">192.168.1.2</span><span class="p">:</span><span class="mi">80</span>
</pre></div>
</div>
<p>Notice that if you specify a name, it can at most resolve to one IPv4
<em>and</em> one IPv6 address.</p>
<p>For more advanced use, you will want to specify a VCL program with <code class="docutils literal notranslate"><span class="pre">-f</span></code>,
but you can start with as little as just:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">backend</span> <span class="n">default</span> <span class="p">{</span>
        <span class="o">.</span><span class="n">host</span> <span class="o">=</span> <span class="s2">&quot;localhost:81&quot;</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>which is, by the way, <em>precisely</em> what ‘-b’ does.</p>
</section>
<section id="optional-arguments">
<h2>Optional arguments<a class="headerlink" href="#optional-arguments" title="Link to this heading">¶</a></h2>
<p>For a complete list of the command line arguments please see
<a class="reference internal" href="../reference/varnishd.html#ref-varnishd-options"><span class="std std-ref">varnishd(1) options</span></a>.</p>
</section>
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<li><a class="reference internal" href="#">Required command line arguments</a><ul>
<li><a class="reference internal" href="#a-listen-address">‘-a’ <em>listen_address</em></a></li>
<li><a class="reference internal" href="#f-vcl-file-or-b-backend">‘-f’ <em>VCL-file</em> or ‘-b’ <em>backend</em></a></li>
<li><a class="reference internal" href="#optional-arguments">Optional arguments</a></li>
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