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Code Editor : operation-logging.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Logging in Varnish — Varnish version 5.2.1 documentation</title> <link rel="stylesheet" href="../_static/classic.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '5.2.1', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="top" title="Varnish version 5.2.1 documentation" href="../index.html" /> <link rel="up" title="Reporting and statistics" href="report.html" /> <link rel="next" title="Statistics" href="operation-statistics.html" /> <link rel="prev" title="Reporting and statistics" href="report.html" /> </head> <body role="document"> <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="operation-statistics.html" title="Statistics" accesskey="N">next</a> |</li> <li class="right" > <a href="report.html" title="Reporting and statistics" accesskey="P">previous</a> |</li> <li class="nav-item nav-item-0"><a href="../index.html">Varnish version 5.2.1 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="index.html" >The Varnish Users Guide</a> »</li> <li class="nav-item nav-item-2"><a href="report.html" accesskey="U">Reporting and statistics</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="logging-in-varnish"> <span id="users-guide-logging"></span><h1>Logging in Varnish<a class="headerlink" href="#logging-in-varnish" title="Permalink to this headline">ΒΆ</a></h1> <p>One of the really nice features in Varnish is the way logging works. Instead of logging to a normal log file Varnish logs to a shared memory segment, called the VSL - the Varnish Shared Log. When the end of the segment is reached we start over, overwriting old data.</p> <p>This is much, much faster than logging to a file and it doesn't require disk space. Besides it gives you much, much more information when you need it.</p> <p>The flip side is that if you forget to have a program actually write the logs to disk they will be overwritten.</p> <p><cite>varnishlog</cite> is one of the programs you can use to look at what Varnish is logging. <cite>varnishlog</cite> gives you the raw logs, everything that is written to the logs. There are other clients that can access the logs as well, we'll show you these later.</p> <p>In the terminal window you started Varnish now type <code class="docutils literal"><span class="pre">varnishlog</span> <span class="pre">-g</span> <span class="pre">raw</span></code> and press enter.</p> <p>You'll see lines like these scrolling slowly by.:</p> <div class="highlight-default"><div class="highlight"><pre><span></span><span class="mi">0</span> <span class="n">CLI</span> <span class="o">-</span> <span class="n">Rd</span> <span class="n">ping</span> <span class="mi">0</span> <span class="n">CLI</span> <span class="o">-</span> <span class="n">Wr</span> <span class="mi">200</span> <span class="mi">19</span> <span class="n">PONG</span> <span class="mi">1273698726</span> <span class="mf">1.0</span> </pre></div> </div> <p>These is the Varnish master process checking up on the caching process to see that everything is OK.</p> <p>Now go to the browser and reload the page displaying your web app.</p> <p>You'll see lines like these.:</p> <div class="highlight-default"><div class="highlight"><pre><span></span><span class="mi">11</span> <span class="n">SessOpen</span> <span class="n">c</span> <span class="mf">127.0</span><span class="o">.</span><span class="mf">0.1</span> <span class="mi">58912</span> <span class="p">:</span><span class="mi">8080</span> <span class="mf">0.0</span><span class="o">.</span><span class="mf">0.0</span> <span class="mi">8080</span> <span class="mf">1273698726.933590</span> <span class="mi">14</span> <span class="mi">11</span> <span class="n">ReqStart</span> <span class="n">c</span> <span class="mf">127.0</span><span class="o">.</span><span class="mf">0.1</span> <span class="mi">58912</span> <span class="mi">11</span> <span class="n">ReqMethod</span> <span class="n">c</span> <span class="n">GET</span> <span class="mi">11</span> <span class="n">ReqURL</span> <span class="n">c</span> <span class="o">/</span> <span class="mi">11</span> <span class="n">ReqProtocol</span> <span class="n">c</span> <span class="n">HTTP</span><span class="o">/</span><span class="mf">1.1</span> <span class="mi">11</span> <span class="n">ReqHeader</span> <span class="n">c</span> <span class="n">Host</span><span class="p">:</span> <span class="n">localhost</span><span class="p">:</span><span class="mi">8080</span> <span class="mi">11</span> <span class="n">ReqHeader</span> <span class="n">c</span> <span class="n">Connection</span><span class="p">:</span> <span class="n">keep</span><span class="o">-</span><span class="n">alive</span> </pre></div> </div> <p>The first column is an arbitrary number, it identifies the transaction. Lines with the same number are coming from the same transaction. The second column is the <em>tag</em> of the log message. All log entries are tagged with a tag indicating what sort of activity is being logged.</p> <p>The third column tell us whether this is is data coming from or going to the client ('c'), or the backend ('b'). The forth column is the data being logged.</p> <p>Now, you can filter quite a bit with <cite>varnishlog</cite>. The basic options we think you want to know are:</p> <dl class="docutils"> <dt>'-b'</dt> <dd>Only show log lines from traffic going between Varnish and the backend servers. This will be useful when we want to optimize cache hit rates.</dd> <dt>'-c'</dt> <dd>Same as '-b' but for client side traffic.</dd> <dt>'-g request'</dt> <dd>Group transactions by request.</dd> <dt>'-q query'</dt> <dd>Only list transactions matching this query.</dd> </dl> <p>For more information on this topic please see <a class="reference internal" href="../reference/varnishlog.html#varnishlog-1"><span class="std std-ref">varnishlog</span></a>.</p> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="report.html" title="previous chapter">Reporting and statistics</a></p> <h4>Next topic</h4> <p class="topless"><a href="operation-statistics.html" title="next chapter">Statistics</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/users-guide/operation-logging.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <form class="search" action="../search.html" method="get"> <div><input type="text" name="q" /></div> <div><input type="submit" value="Go" /></div> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> <script type="text/javascript">$('#searchbox').show(0);</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="operation-statistics.html" title="Statistics" >next</a> |</li> <li class="right" > <a href="report.html" title="Reporting and statistics" >previous</a> |</li> <li class="nav-item nav-item-0"><a href="../index.html">Varnish version 5.2.1 documentation</a> »</li> <li class="nav-item nav-item-1"><a href="index.html" >The Varnish Users Guide</a> »</li> <li class="nav-item nav-item-2"><a href="report.html" >Reporting and statistics</a> »</li> </ul> </div> <div class="footer" role="contentinfo"> © Copyright 2010-2014, Varnish Software AS. 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