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<!DOCTYPE html> <html lang="en" data-content_root="../"> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="viewport" content="width=device-width, initial-scale=1" /> <title>Peculiarities — Varnish version 7.5.0 documentation</title> <link rel="stylesheet" type="text/css" href="../_static/pygments.css?v=fa44fd50" /> <link rel="stylesheet" type="text/css" href="../_static/classic.css?v=e2714048" /> <script src="../_static/documentation_options.js?v=8214db13"></script> <script src="../_static/doctools.js?v=888ff710"></script> <script src="../_static/sphinx_highlight.js?v=dc90522c"></script> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="next" title="Now what?" href="now_what.html" /> <link rel="prev" title="Backend servers" href="backend_servers.html" /> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="now_what.html" title="Now what?" accesskey="N">next</a> |</li> <li class="right" > <a href="backend_servers.html" title="Backend servers" accesskey="P">previous</a> |</li> <li class="nav-item nav-item-0"><a href="../index.html">Varnish version 7.5.0 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="index.html" accesskey="U">The Varnish Tutorial</a> »</li> <li class="nav-item nav-item-this"><a href="">Peculiarities</a></li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <section id="peculiarities"> <h1>Peculiarities<a class="headerlink" href="#peculiarities" title="Link to this heading">¶</a></h1> <p>There are a couple of things that are different with Varnish Cache, as opposed to other programs. One thing you’ve already seen - VCL. In this section we provide a very quick tour of other peculiarities you need to know about to get the most out of Varnish.</p> <section id="configuration"> <h2>Configuration<a class="headerlink" href="#configuration" title="Link to this heading">¶</a></h2> <p>The Varnish Configuration is written in VCL. When Varnish is ran this configuration is transformed into C code and then fed into a C compiler, loaded and executed.</p> <p>So, as opposed to switching various settings on or off, you write polices on how the incoming traffic should be handled.</p> </section> <section id="varnishadm"> <h2>varnishadm<a class="headerlink" href="#varnishadm" title="Link to this heading">¶</a></h2> <p>Varnish Cache has an admin console. You can connect it through the <a class="reference internal" href="../reference/varnishadm.html#varnishadm-1"><span class="std std-ref">varnishadm</span></a> command. In order to connect the user needs to be able to read <cite>/etc/varnish/secret</cite> in order to authenticate.</p> <p>Once you’ve started the console you can do quite a few operations on Varnish, like stopping and starting the cache process, load VCL, adjust the built in load balancer and invalidate cached content.</p> <p>It has a built in command “help” which will give you some hints on what it does.</p> </section> <section id="varnishlog"> <h2>varnishlog<a class="headerlink" href="#varnishlog" title="Link to this heading">¶</a></h2> <p>Varnish does not log to disk. Instead it logs to a chunk of memory. It is actually streaming the logs. At any time you’ll be able to connect to the stream and see what is going on. Varnish logs quite a bit of information. You can have a look at the logstream with the command <a class="reference internal" href="../reference/varnishlog.html#varnishlog-1"><span class="std std-ref">varnishlog</span></a>.</p> </section> </section> <div class="clearer"></div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <div> <h3><a href="../index.html">Table of Contents</a></h3> <ul> <li><a class="reference internal" href="#">Peculiarities</a><ul> <li><a class="reference internal" href="#configuration">Configuration</a></li> <li><a class="reference internal" href="#varnishadm">varnishadm</a></li> <li><a class="reference internal" href="#varnishlog">varnishlog</a></li> </ul> </li> </ul> </div> <div> <h4>Previous topic</h4> <p class="topless"><a href="backend_servers.html" title="previous chapter">Backend servers</a></p> </div> <div> <h4>Next topic</h4> <p class="topless"><a href="now_what.html" title="next chapter">Now what?</a></p> </div> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/tutorial/peculiarities.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3 id="searchlabel">Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" aria-labelledby="searchlabel" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"/> <input type="submit" value="Go" /> </form> </div> </div> <script>document.getElementById('searchbox').style.display = "block"</script> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="now_what.html" title="Now what?" >next</a> |</li> <li class="right" > <a href="backend_servers.html" title="Backend servers" >previous</a> |</li> <li class="nav-item nav-item-0"><a href="../index.html">Varnish version 7.5.0 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="index.html" >The Varnish Tutorial</a> »</li> <li class="nav-item nav-item-this"><a href="">Peculiarities</a></li> </ul> </div> <div class="footer" role="contentinfo"> © Copyright 2010-2014, Varnish Software AS. 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