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http://git-wip-us.apache.org/repos/asf/incubator-trafficcontrol-website/blob/8582b168/docs/1.1.2/admin/traffic_vault.html ---------------------------------------------------------------------- diff --git a/docs/1.1.2/admin/traffic_vault.html b/docs/1.1.2/admin/traffic_vault.html new file mode 100644 index 0000000..28c7e3c --- /dev/null +++ b/docs/1.1.2/admin/traffic_vault.html @@ -0,0 +1,424 @@ + + +<!DOCTYPE html> +<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> +<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + + <title>Traffic Vault Administration — Traffic Control 1.1.2 documentation </title> + + + + + <link rel="shortcut icon" href="../_static/favicon.ico"/> + + + + + + + + + + + + + <link rel="stylesheet" href="../_static/css/theme.css" type="text/css" /> + + + + <link rel="stylesheet" href="../_static/theme_overrides.css" type="text/css" /> + + + + <link rel="top" title="Traffic Control 1.1.2 documentation" href="../index.html"/> + <link rel="up" title="Administratorâs Guide" href="index.html"/> + <link rel="next" title="Developerâs Guide" href="../development/index.html"/> + <link rel="prev" title="Traffic Server Administration" href="traffic_server.html"/> + + + <script src="_static/js/modernizr.min.js"></script> + +</head> + +<body class="wy-body-for-nav" role="document"> + + <div class="wy-grid-for-nav"> + + + <nav data-toggle="wy-nav-shift" class="wy-nav-side"> + <div class="wy-side-nav-search"> + + + + <a href="/" class="icon icon-home"> Traffic Control + + + + + <img src="../_static/tc_logo.png" class="logo" /> + + </a> + + +<div role="search"> + <form id="rtd-search-form" class="wy-form" action="../search.html" method="get"> + <input type="text" name="q" placeholder="Search docs" /> + <input type="hidden" name="check_keywords" value="yes" /> + <input type="hidden" name="area" value="default" /> 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href="../overview/introduction.html">Introduction</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_ops.html">Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_router.html">Traffic Router</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_monitor.html">Traffic Monitor</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_stats.html">Traffic Stats</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_portal.html">Traffic Portal</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_server.html">Traffic Server</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_vault.html">Traffic Vault</a></li> +</ul> +</li> +</ul> +<ul class="current"> +<li class="toctree-l1 current"><a class="reference internal" href="index.html">Administrator’s Guide</a><ul class="current"> +<li class="toctree-l2"><a class="reference internal" href="traffic_ops_install.html">Installing Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="traffic_ops_config.html">Configuring Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="traffic_ops_using.html">Using Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="traffic_ops_extensions.html">Managing Traffic Ops Extensions</a></li> +<li class="toctree-l2"><a class="reference internal" href="traffic_monitor.html">Traffic Monitor Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="traffic_router.html">Traffic Router Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="traffic_stats.html">Traffic Stats Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="traffic_server.html">Traffic Server Administration</a></li> +<li class="toctree-l2 current"><a class="current reference internal" href="">Traffic Vault Administration</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../development/index.html">Developer’s Guide</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_ops.html">Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_router.html">Traffic Router</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_monitor.html">Traffic Monitor</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_stats.html">Traffic Stats</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_server.html">Traffic Server</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../faq/index.html">FAQ</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../faq/general.html">General</a></li> +<li class="toctree-l2"><a class="reference internal" href="../faq/development.html">Development</a></li> +<li class="toctree-l2"><a class="reference internal" href="../faq/administration.html">Running a Traffic Control CDN</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../glossary.html">Glossary</a></li> +</ul> + + + + </div> + + </nav> + + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> + + + <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../index.html">Traffic Control</a> + </nav> + + + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="breadcrumbs navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../index.html">Traffic Control 1.1.2</a> »</li> + + <li><a href="index.html">Administrator’s Guide</a> »</li> + + <li>Traffic Vault Administration</li> + <li class="wy-breadcrumbs-aside"> + + <a href="../_sources/admin/traffic_vault.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="../development/index.html" class="btn btn-neutral float-right" title="Developerâs Guide">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="traffic_server.html" class="btn btn-neutral" title="Traffic Server Administration"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + <div role="main" class="document"> + + <div class="section" id="traffic-vault-administration"> +<h1>Traffic Vault Administration<a class="headerlink" href="#traffic-vault-administration" title="Permalink to this headline">¶</a></h1> +<div class="section" id="installing-traffic-vault"> +<h2>Installing Traffic Vault<a class="headerlink" href="#installing-traffic-vault" title="Permalink to this headline">¶</a></h2> +<p>In order to successfully store private keys you will need to install Riak. +The latest version of Riak can be downloaded on the Riak <a class="reference external" href="http://docs.basho.com/riak/latest/downloads/";>website</a>. +The installation instructions for Riak can be found <a class="reference external" href="http://docs.basho.com/riak/latest/ops/building/installing/";>here</a>.</p> +<p>Production is currently running version 2.0.5 of Riak, but the latest version should suffice.</p> +</div> +<div class="section" id="configuring-traffic-vault"> +<h2>Configuring Traffic Vault<a class="headerlink" href="#configuring-traffic-vault" title="Permalink to this headline">¶</a></h2> +<p>The following steps were taken to configure Riak in our environments.</p> +<div class="section" id="riak-configuration-file-configuration"> +<h3>Riak configuration file configuration<a class="headerlink" href="#riak-configuration-file-configuration" title="Permalink to this headline">¶</a></h3> +<p>The following steps need to be performed on each Riak server in the cluster:</p> +<ul> +<li><p class="first">Log into riak server as root</p> +</li> +<li><p class="first">cd to /etc/riak/</p> +</li> +<li><dl class="first docutils"> +<dt>Update the following in riak.conf to reflect your IP:</dt> +<dd><ul class="first last simple"> +<li>nodename = <a class="reference external" href="mailto:riak%40a-host.sys.kabletown.net";>riak<span>@</span>a-host<span>.</span>sys<span>.</span>kabletown<span>.</span>net</a></li> +<li>listener.http.internal = a-host.sys.kabletown.net:8098 (can be 80 - This endpoint will not work with sec enabled)</li> +<li>listener.protobuf.internal = a-host.sys.kabletown.net:8087 (can be different port if you want)</li> +<li>listener.https.internal = a-host.sys.kabletown.net:8088 (can be 443)</li> +</ul> +</dd> +</dl> +</li> +<li><dl class="first docutils"> +<dt>Updated the following conf file to point to your cert files</dt> +<dd><ul class="first last simple"> +<li>ssl.certfile = /etc/riak/certs/server.crt</li> +<li>ssl.keyfile = /etc/riak/certs/server.key</li> +<li>ssl.cacertfile = /etc/pki/tls/certs/ca-bundle.crt</li> +</ul> +</dd> +</dl> +</li> +<li><dl class="first docutils"> +<dt>Add a line at the bottom of the config for tlsv1</dt> +<dd><ul class="first last simple"> +<li>tls_protocols.tlsv1 = on</li> +</ul> +</dd> +</dl> +</li> +<li><dl class="first docutils"> +<dt>Once the config file has been updated restart riak</dt> +<dd><ul class="first last simple"> +<li><code class="docutils literal"><span class="pre">/etc/init.d/riak</span> <span class="pre">restart</span></code></li> +</ul> +</dd> +</dl> +</li> +<li><dl class="first docutils"> +<dt>Validate server is running by going to the following URL:</dt> +<dd><ul class="first last simple"> +<li><a class="reference external" href="https:/">https:/</a>/<serverHostname>:8088/ping</li> +</ul> +</dd> +</dl> +</li> +</ul> +</div> +<div class="section" id="riak-admin-configuration"> +<h3>Riak-admin configuration<a class="headerlink" href="#riak-admin-configuration" title="Permalink to this headline">¶</a></h3> +<p>Riak-admin is a command line utility that needs to be run as root on a server in the riak cluster.</p> +<dl class="docutils"> +<dt>Assumptions:</dt> +<dd><ul class="first last simple"> +<li>Riak 2.0.2 or greater is installed</li> +<li>SSL Certificates have been generated (signed or self-signed)</li> +<li>Root access to riak servers</li> +</ul> +</dd> +<dt>Add admin user and riakuser to riak</dt> +<dd><ul class="first last simple"> +<li>Admin user will be a super user</li> +<li>Riakuser will be the application user</li> +</ul> +</dd> +</dl> +<p>Login to one of the riak servers in the cluster as root (any will do)</p> +<blockquote> +<div><ol class="arabic"> +<li><p class="first">Enable security</p> +<blockquote> +<div><p><code class="docutils literal"><span class="pre">riak-admin</span> <span class="pre">security</span> <span class="pre">enable</span></code></p> +</div></blockquote> +</li> +<li><p class="first">Add groups</p> +<blockquote> +<div><p><code class="docutils literal"><span class="pre">riak-admin</span> <span class="pre">security</span> <span class="pre">add-group</span> <span class="pre">admins</span></code></p> +<p><code class="docutils literal"><span class="pre">riak-admin</span> <span class="pre">security</span> <span class="pre">add-group</span> <span class="pre">keysusers</span></code></p> +</div></blockquote> +</li> +<li><p class="first">Add users</p> +</li> +</ol> +<blockquote> +<div><div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">username and password should be stored in /opt/traffic_ops/app/conf/<environment>/riak.conf</p> +</div> +<blockquote> +<div><p><code class="docutils literal"><span class="pre">riak-admin</span> <span class="pre">security</span> <span class="pre">add-user</span> <span class="pre">admin</span> <span class="pre">password=<AdminPassword></span> <span class="pre">groups=admins</span></code></p> +<p><code class="docutils literal"><span class="pre">riak-admin</span> <span class="pre">security</span> <span class="pre">add-user</span> <span class="pre">riakuser</span> <span class="pre">password=<RiakUserPassword></span> <span class="pre">groups=keysusers</span></code></p> +</div></blockquote> +</div></blockquote> +<ol class="arabic" start="4"> +<li><p class="first">Grant access for admin and riakuser</p> +<blockquote> +<div><p><code class="docutils literal"><span class="pre">riak-admin</span> <span class="pre">security</span> <span class="pre">add-source</span> <span class="pre">riakuser</span> <span class="pre">0.0.0.0/0</span> <span class="pre">password</span></code></p> +<p><code class="docutils literal"><span class="pre">riak-admin</span> <span class="pre">security</span> <span class="pre">add-source</span> <span class="pre">admin</span> <span class="pre">0.0.0.0/0</span> <span class="pre">password</span></code></p> +</div></blockquote> +</li> +<li><p class="first">Grant privs to admins for everything</p> +<blockquote> +<div><p><code class="docutils literal"><span class="pre">riak-admin</span> <span class="pre">security</span> <span class="pre">grant</span> <span class="pre">riak_kv.list_buckets,riak_kv.list_keys,riak_kv.get,riak_kv.put,riak_kv.delete</span> <span class="pre">on</span> <span class="pre">any</span> <span class="pre">to</span> <span class="pre">admins</span></code></p> +</div></blockquote> +</li> +<li><p class="first">Grant privs to keysuser for ssl, dnssec, and url_sig_keys buckets only</p> +<blockquote> +<div><p><code class="docutils literal"><span class="pre">riak-admin</span> <span class="pre">security</span> <span class="pre">grant</span> <span class="pre">riak_kv.get,riak_kv.put,riak_kv.delete</span> <span class="pre">on</span> <span class="pre">default</span> <span class="pre">ssl</span> <span class="pre">to</span> <span class="pre">keysusers</span></code></p> +<p><code class="docutils literal"><span class="pre">riak-admin</span> <span class="pre">security</span> <span class="pre">grant</span> <span class="pre">riak_kv.get,riak_kv.put,riak_kv.delete</span> <span class="pre">on</span> <span class="pre">default</span> <span class="pre">dnssec</span> <span class="pre">to</span> <span class="pre">keysusers</span></code></p> +<p><code class="docutils literal"><span class="pre">riak-admin</span> <span class="pre">security</span> <span class="pre">grant</span> <span class="pre">riak_kv.get,riak_kv.put,riak_kv.delete</span> <span class="pre">on</span> <span class="pre">default</span> <span class="pre">url_sig_keys</span> <span class="pre">to</span> <span class="pre">keysusers</span></code></p> +</div></blockquote> +</li> +</ol> +</div></blockquote> +<div class="admonition seealso"> +<p class="first admonition-title">See also</p> +<p class="last">For more information on security in Riak, see the <a class="reference external" href="http://docs.basho.com/riak/2.0.4/ops/advanced/security/";>Riak Security documentation</a>.</p> +</div> +<div class="admonition seealso"> +<p class="first admonition-title">See also</p> +<p class="last">For more information on authentication and authorization in Riak, see the <a class="reference external" href="http://docs.basho.com/riak/2.0.4/ops/running/authz/";>Riak Authentication and Authorization documentation</a>.</p> +</div> +</div> +<div class="section" id="traffic-ops-configuration"> +<h3>Traffic Ops Configuration<a class="headerlink" href="#traffic-ops-configuration" title="Permalink to this headline">¶</a></h3> +<p>There are a couple conifgurations that are necessary in Traffic Ops.</p> +<ol class="arabic"> +<li><dl class="first docutils"> +<dt>Database Updates</dt> +<dd><ul class="first simple"> +<li>A new profile for Riak needs to be added to the profile table</li> +<li>A new type of Riak needs to be added to the type table</li> +<li>The servers in the Riak cluster need to be added to the server table</li> +</ul> +<blockquote class="last"> +<div><div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">profile and type data should be pre-loaded by seeds sql script.</p> +</div> +</div></blockquote> +</dd> +</dl> +</li> +<li><dl class="first docutils"> +<dt>Configuration updates</dt> +<dd><ul class="first last simple"> +<li>/opt/traffic_ops/app/conf/<environment>/riak.conf needs to be updated to reflect the correct username and password for accessing riak.</li> +</ul> +</dd> +</dl> +</li> +</ol> +</div> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="../development/index.html" class="btn btn-neutral float-right" title="Developerâs Guide">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="traffic_server.html" class="btn btn-neutral" 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class="toctree-l2"><a class="reference internal" href="../overview/introduction.html">Introduction</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_ops.html">Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_router.html">Traffic Router</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_monitor.html">Traffic Monitor</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_stats.html">Traffic Stats</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_portal.html">Traffic Portal</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_server.html">Traffic Server</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_vault.html">Traffic Vault</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../admin/index.html">Administrator’s Guide</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_install.html">Installing Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_config.html">Configuring Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_using.html">Using Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_extensions.html">Managing Traffic Ops Extensions</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_monitor.html">Traffic Monitor Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_router.html">Traffic Router Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_stats.html">Traffic Stats Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_server.html">Traffic Server Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_vault.html">Traffic Vault Administration</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../development/index.html">Developer’s Guide</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_ops.html">Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_router.html">Traffic Router</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_monitor.html">Traffic Monitor</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_stats.html">Traffic Stats</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_server.html">Traffic Server</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a 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Control 1.1.2</a> »</li> + + <li><a href="index.html">CDN Basics</a> »</li> + + <li>Cache Control Headers and Revalidation</li> + <li class="wy-breadcrumbs-aside"> + + <a href="../_sources/basics/cache_revalidation.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="../overview/index.html" class="btn btn-neutral float-right" title="Traffic Control Overview">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="caching_proxies.html" class="btn btn-neutral" title="Caching Proxies"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + <div role="main" class="document"> + + <div class="section" id="cache-control-headers-and-revalidation"> +<span id="index-0"></span><h1>Cache Control Headers and Revalidation<a class="headerlink" href="#cache-control-headers-and-revalidation" title="Permalink to this headline">¶</a></h1> +<p>The <a class="reference external" href="https://www.ietf.org/rfc/rfc2616.txt";>HTTP/1.1 spec</a> allows for origin servers and clients to influence how caches treat their requests and responses. By default, the Traffic Control CDN will honor cache control headers. Most commonly, origin servers will tell the downstream caches how long a response can be cached:</p> +<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK +Date: Sun, 14 Dec 2014 23:22:44 GMT +Server: Apache/2.2.15 (Red Hat) +Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT +ETag: "1aa008f-2d-50a3559482cc0" +Cache-Control: max-age=86400 +Content-Length: 45 +Connection: close +Content-Type: text/html; charset=UTF-8 + +<html><body>This is a fun file</body></html> +</pre></div> +</div> +<p>In the above response, the origin server tells downstream caching systems that the maximum time to cache this response for is 86400 seconds. The origin can also add a <code class="docutils literal"><span class="pre">Expires:</span></code> header, explicitly telling the cache the time this response is to be expired. When a response is expired it usually doesn’t get deleted from the cache, but, when a request comes in that would have hit on this response if it was not expired, the cache <em>revalidates</em> the response. In stead of requesting the object again from the origin server, the cache will send a request to the origin indicating what version of the response it has, and asking if it has changed. If it changed, the server will send a <code class="docutils literal"><span class="pre">200</span> <span class="pre">OK</span></code> response, with the new data. If it has not changed, the origin server will send back a <code class="docutils literal"><span class="pre">304</spa n> <span class="pre">Not</span> <span class="pre">Modified</span></code> response indicating the response is still valid, and that the cache can reset the timer on the response expiration. To indicate what version the client (cache) has it will add an <code class="docutils literal"><span class="pre">If-Not-Modified-Since:</span></code> header, or an <code class="docutils literal"><span class="pre">If-None-Match:</span></code> header. For example, in the <code class="docutils literal"><span class="pre">If-None-Match:</span></code> case, the origin will send and <code class="docutils literal"><span class="pre">ETag</span></code> header that uniquely identifies the response. The client can use that in an revalidation request like:</p> +<div class="highlight-python"><div class="highlight"><pre>GET /foo/bar/fun.html HTTP/1.1 +If-None-Match: "1aa008f-2d-50a3559482cc0" +Host: www.origin.com +</pre></div> +</div> +<p>If the content has changed (meaning, the new response would not have had the same ETag) it will respond with <code class="docutils literal"><span class="pre">200</span> <span class="pre">OK</span></code>, like:</p> +<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK +Date: Sun, 18 Dec 2014 3:22:44 GMT +Server: Apache/2.2.15 (Red Hat) +Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT +ETag: "1aa008f-2d-50aa00feadd" +Cache-Control: max-age=604800 +Content-Length: 49 +Connection: close +Content-Type: text/html; charset=UTF-8 + +<html><body>This is NOT a fun file</body></html> +</pre></div> +</div> +<p>If the Content did not change (meaning, the response would have had the same ETag) it will respond with <code class="docutils literal"><span class="pre">304</span> <span class="pre">Not</span> <span class="pre">Modified</span></code>, like:</p> +<div class="highlight-python"><div class="highlight"><pre>304 Not Modified +Date: Sun, 18 Dec 2014 3:22:44 GMT +Server: Apache/2.2.15 (Red Hat) +Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT +ETag: "1aa008f-2d-50a3559482cc0" +Cache-Control: max-age=604800 +Content-Length: 45 +Connection: close +Content-Type: text/html; charset=UTF-8 +</pre></div> +</div> +<p>Note that the 304 response only has headers, not the data.</p> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="../overview/index.html" class="btn btn-neutral float-right" title="Traffic Control Overview">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="caching_proxies.html" class="btn btn-neutral" title="Caching Proxies"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div 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+ + </div> + + <div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation"> + + + + <ul class="current"> +<li class="toctree-l1 current"><a class="reference internal" href="index.html">CDN Basics</a><ul class="current"> +<li class="toctree-l2"><a class="reference internal" href="content_delivery_networks.html">Content Delivery Networks</a></li> +<li class="toctree-l2"><a class="reference internal" href="http_11.html">HTTP 1.1</a></li> +<li class="toctree-l2 current"><a class="current reference internal" href="">Caching Proxies</a></li> +<li class="toctree-l2"><a class="reference internal" href="cache_revalidation.html">Cache Control Headers and Revalidation</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../overview/index.html">Traffic Control Overview</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../overview/introduction.html">Introduction</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_ops.html">Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_router.html">Traffic Router</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_monitor.html">Traffic Monitor</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_stats.html">Traffic Stats</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_portal.html">Traffic Portal</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_server.html">Traffic Server</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_vault.html">Traffic Vault</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../admin/index.html">Administrator’s Guide</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_install.html">Installing Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_config.html">Configuring Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_using.html">Using Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_extensions.html">Managing Traffic Ops Extensions</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_monitor.html">Traffic Monitor Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_router.html">Traffic Router Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_stats.html">Traffic Stats Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_server.html">Traffic Server Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_vault.html">Traffic Vault Administration</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../development/index.html">Developer’s Guide</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_ops.html">Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_router.html">Traffic Router</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_monitor.html">Traffic Monitor</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_stats.html">Traffic Stats</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_server.html">Traffic Server</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../faq/index.html">FAQ</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../faq/general.html">General</a></li> +<li class="toctree-l2"><a class="reference internal" href="../faq/development.html">Development</a></li> +<li class="toctree-l2"><a class="reference internal" href="../faq/administration.html">Running a Traffic Control CDN</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../glossary.html">Glossary</a></li> +</ul> + + + + </div> + + </nav> + + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> + + + <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../index.html">Traffic Control</a> + </nav> + + + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="breadcrumbs navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../index.html">Traffic Control 1.1.2</a> »</li> + + <li><a href="index.html">CDN Basics</a> »</li> + + <li>Caching Proxies</li> + <li class="wy-breadcrumbs-aside"> + + <a href="../_sources/basics/caching_proxies.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="cache_revalidation.html" class="btn btn-neutral float-right" title="Cache Control Headers and Revalidation">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="http_11.html" class="btn btn-neutral" title="HTTP 1.1"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + <div role="main" class="document"> + + <div class="section" id="caching-proxies"> +<span id="rl-caching-proxy"></span><h1>Caching Proxies<a class="headerlink" href="#caching-proxies" title="Permalink to this headline">¶</a></h1> +<p>The main function of a CDN is to proxy requests from clients to origin servers +and cache the results. +To proxy, in the CDN context, is to obtain content using HTTP from an origin +server on behalf of a client. To cache is to store the results so they can be +reused when other clients are requesting the same content. There are three +types of proxies in use on the Internet today which are described below.</p> +<div class="section" id="arrow-reverse-proxy"> +<span id="rl-rev-proxy"></span><span id="index-0"></span><h2><img alt="arrow" src="../_images/fwda.png" /> Reverse Proxy<a class="headerlink" href="#arrow-reverse-proxy" title="Permalink to this headline">¶</a></h2> +<blockquote> +<div>A reverse proxy acts on behalf of the origin server. The client is mostly unaware it is communicating with a proxy and not the actual origin. +All EDGE caches in a Traffic Control CDN are reverse proxies. +To the end user a Traffic Control based CDN appears as a reverse proxy since +it retrieves content from the origin server, acting on behalf of that origin server. The client requests a URL that has +a hostname which resolves to the reverse proxy’s IP address and, in compliance +with the HTTP 1.1 specification, the client sends a <code class="docutils literal"><span class="pre">Host:</span></code> header to the reverse +proxy including the hostname in the URL. The proxy looks up the hostname in a +list of mappings to find the origin hostname; if the origin hostname is not found in the list, the proxy connects to the +origin host and requests the path of the original URL. The proxy then stores the URL in cache and serves the contents to the client. When there are subsequent requests for +the same URL, a caching proxy serves the content out of cache thereby reducing +latency and network traffic.</div></blockquote> +<div class="admonition seealso"> +<p class="first admonition-title">See also</p> +<p class="last"><a class="reference external" href="https://docs.trafficserver.apache.org/en/latest/admin/reverse-proxy-http-redirects.en.html#http-reverse-proxy";>ATS documentation on reverse proxy</a>.</p> +</div> +<p>To insert a reverse proxy into the previous HTTP 1.1 example, the reverse proxy requires provisioning +for <code class="docutils literal"><span class="pre">www.origin.com</span></code>. By adding a remap rule to the cache, the reverse proxy then maps requests to +this origin. The content owner must inform the clients, by updating the URL, to receive the content +from the cache and not from the origin server directly. For this example, the remap rule on the +cache is: <code class="docutils literal"><span class="pre">http://www-origin-cache.cdn.com</span> <span class="pre">http://www.origin.com</span></code>.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">In the previous example minimal headers were shown on both the request and response. In the examples that follow, the origin server response is more realistic.</p> +</div> +<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK +Date: Sun, 14 Dec 2014 23:22:44 GMT +Server: Apache/2.2.15 (Red Hat) +Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT +ETag: "1aa008f-2d-50a3559482cc0" +Content-Length: 45 +Connection: close +Content-Type: text/html; charset=UTF-8 + +<html><body>This is a fun file</body></html> +</pre></div> +</div> +<p>The client is given the URL <code class="docutils literal"><span class="pre">http://www-origin-cache.cdn.com/foo/bar/fun.html</span></code> (note the different hostname) and when attempting to obtain that URL, the following occurs:</p> +<ol class="arabic"> +<li><p class="first">The client sends a request to the LDNS server to resolve the name <code class="docutils literal"><span class="pre">www-origin-cache.cdn.com</span></code> to an IPv4 address.</p> +</li> +<li><p class="first">Similar to the previous case, the LDNS server resolves the name <code class="docutils literal"><span class="pre">www-origin-cache.cdn.com</span></code> to an IPv4 address, in this example, this address is 55.44.33.22.</p> +</li> +<li><p class="first">The client opens a TCP connection from a random port locally, to port 80 (the HTTP default) on 55.44.33.22, and sends the following:</p> +<div class="highlight-python"><div class="highlight"><pre>GET /foo/bar/fun.html HTTP/1.1 +Host: www-origin-cache.cdn.com +</pre></div> +</div> +</li> +<li><p class="first">The reverse proxy looks up <code class="docutils literal"><span class="pre">www-origin-cache.cdn.com</span></code> in its remap rules, and finds the origin is <code class="docutils literal"><span class="pre">www.origin.com</span></code>.</p> +</li> +<li><p class="first">The proxy checks its cache to see if the response for <code class="docutils literal"><span class="pre">http://www-origin-cache.cdn.com/foo/bar/fun.html</span></code> is already in the cache.</p> +</li> +</ol> +<p>6a. If the response is not in the cache:</p> +<blockquote> +<div><ol class="arabic"> +<li><p class="first">The proxy uses DNS to get the IPv4 address for <code class="docutils literal"><span class="pre">www.origin.com</span></code>, connect to it on port 80, and sends:</p> +<div class="highlight-python"><div class="highlight"><pre>GET /foo/bar/fun.html HTTP/1.1 +Host: www.origin.com +</pre></div> +</div> +</li> +<li><p class="first">The origin server responds with the headers and content as shown:</p> +<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK +Date: Sun, 14 Dec 2014 23:22:44 GMT +Server: Apache/2.2.15 (Red Hat) +Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT +ETag: "1aa008f-2d-50a3559482cc0" +Content-Length: 45 +Connection: close +Content-Type: text/html; charset=UTF-8 + +<html><body>This is a fun file</body></html> +</pre></div> +</div> +</li> +<li><p class="first">The proxy sends the origin response on to the client adding a <code class="docutils literal"><span class="pre">Via:</span></code> header (and maybe others):</p> +<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK +Date: Sun, 14 Dec 2014 23:22:44 GMT +Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT +ETag: "1aa008f-2d-50a3559482cc0" +Content-Length: 45 +Connection: close +Content-Type: text/html; charset=UTF-8 +Age: 0 +Via: http/1.1 cache01.cdn.kabletown.net (ApacheTrafficServer/4.2.1 [uScSsSfUpSeN:t cCSi p sS]) +Server: ATS/4.2.1 + + <html><body>This is a fun file</body></html> +</pre></div> +</div> +</li> +</ol> +</div></blockquote> +<p>6b. If it <em>is</em> in the cache:</p> +<blockquote> +<div><p>The proxy responds to the client with the previously retrieved result:</p> +<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK +Date: Sun, 14 Dec 2014 23:22:44 GMT +Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT +ETag: "1aa008f-2d-50a3559482cc0" +Content-Length: 45 +Connection: close +Content-Type: text/html; charset=UTF-8 +Age: 39711 +Via: http/1.1 cache01.cdn.kabletown.net (ApacheTrafficServer/4.2.1 [uScSsSfUpSeN:t cCSi p sS]) +Server: ATS/4.2.1 + +<html><body>This is a fun file</body></html> +</pre></div> +</div> +</div></blockquote> +</div> +<div class="section" id="arrow-forward-proxy"> +<span id="rl-fwd-proxy"></span><span id="index-1"></span><h2><img alt="arrow" src="../_images/fwda.png" /> Forward Proxy<a class="headerlink" href="#arrow-forward-proxy" title="Permalink to this headline">¶</a></h2> +<blockquote> +<div>A forward proxy acts on behalf of the client. The origin server is mostly +unaware of the proxy, the client requests the proxy to retrieve content from a +particular origin server. All MID caches in a Traffic Control based CDN are +forward proxies. In a forward proxy scenario, the client configuration is with +the proxy’s IP address and port. The client always connects to the forward +proxy for content. The content provider does not have to change the URL the +client obtains, and is unaware of the proxy in the middle.</div></blockquote> +<div class="admonition seealso"> +<p class="first admonition-title">See also</p> +<p class="last"><a class="reference external" href="https://docs.trafficserver.apache.org/en/latest/admin/forward-proxy.en.html";>ATS documentation on forward proxy</a>.</p> +</div> +<p>Below is an example of the client retrieving the URL <code class="docutils literal"><span class="pre">http://www.origin.com/foo/bar/fun.html</span></code> through a forward proxy:</p> +<ol class="arabic simple"> +<li>The client requires configuration to use the proxy, as opposed to the reverse proxy example. Assume the client configuration is through preferences entries or other to use the proxy IP address 99.88.77.66 and proxy port 8080.</li> +<li>To retrieve <code class="docutils literal"><span class="pre">http://www.origin.com/foo/bar/fun.html</span></code> URL, the client connects to 99.88.77.66 on port 8080 and sends:</li> +</ol> +<blockquote> +<div><div class="highlight-python"><div class="highlight"><pre>GET http://www.origin.com/foo/bar/fun.html HTTP/1.1 +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">In this case, the client places the entire URL after GET, including protocol and hostname (<code class="docutils literal"><span class="pre">http://www.origin.com</span></code>), but in the reverse proxy and direct-to-origin case it puts only the path portion of the URL (<code class="docutils literal"><span class="pre">/foo/bar/fun.html</span></code>) after the GET.</p> +</div> +</div></blockquote> +<ol class="arabic simple" start="3"> +<li>The proxy verifies whether the response for <code class="docutils literal"><span class="pre">http://www-origin-cache.cdn.com/foo/bar/fun.html</span></code> is already in the cache.</li> +</ol> +<p>4a. If it is not in the cache:</p> +<blockquote> +<div><ol class="arabic"> +<li><p class="first">The proxy uses DNS to obtain the IPv4 address for <code class="docutils literal"><span class="pre">www.origin.com</span></code>, connects to it on port 80, and sends:</p> +<div class="highlight-python"><div class="highlight"><pre>GET /foo/bar/fun.html HTTP/1.1 +Host: www.origin.com +</pre></div> +</div> +</li> +<li><p class="first">The origin server responds with the headers and content as shown below:</p> +<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK +Date: Sun, 14 Dec 2014 23:22:44 GMT +Server: Apache/2.2.15 (Red Hat) +Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT +ETag: "1aa008f-2d-50a3559482cc0" +Content-Length: 45 +Connection: close +Content-Type: text/html; charset=UTF-8 + +<html><body>This is a fun file</body></html> +</pre></div> +</div> +</li> +<li><p class="first">The proxy sends this on to the client adding a <code class="docutils literal"><span class="pre">Via:</span></code> header (and maybe others):</p> +<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK +Date: Sun, 14 Dec 2014 23:22:44 GMT +Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT +ETag: "1aa008f-2d-50a3559482cc0" +Content-Length: 45 +Connection: close +Content-Type: text/html; charset=UTF-8 +Age: 0 +Via: http/1.1 cache01.cdn.kabletown.net (ApacheTrafficServer/4.2.1 [uScSsSfUpSeN:t cCSi p sS]) +Server: ATS/4.2.1 + +<html><body>This is a fun file</body></html> +</pre></div> +</div> +</li> +</ol> +</div></blockquote> +<p>4b. If it <em>is</em> in the cache:</p> +<blockquote> +<div><p>The proxy responds to the client with the previously retrieved result:</p> +<div class="highlight-python"><div class="highlight"><pre>HTTP/1.1 200 OK +Date: Sun, 14 Dec 2014 23:22:44 GMT +Last-Modified: Sun, 14 Dec 2014 23:18:51 GMT +ETag: "1aa008f-2d-50a3559482cc0" +Content-Length: 45 +Connection: close +Content-Type: text/html; charset=UTF-8 +Age: 99711 +Via: http/1.1 cache01.cdn.kabletown.net (ApacheTrafficServer/4.2.1 [uScSsSfUpSeN:t cCSi p sS]) +Server: ATS/4.2.1 + +<html><body>This is a fun file</body></html> +</pre></div> +</div> +</div></blockquote> +</div> +<div class="section" id="arrow-transparent-proxy"> +<span id="index-2"></span><h2><img alt="arrow" src="../_images/fwda.png" /> Transparent Proxy<a class="headerlink" href="#arrow-transparent-proxy" title="Permalink to this headline">¶</a></h2> +<blockquote> +<div>Neither the origin nor the client are aware of the actions performed by the transparent proxies. A Traffic Control based CDN does not use transparent proxies. If you are interested you can learn more about transparent proxies on <a class="reference external" href="http://en.wikipedia.org/wiki/Proxy_server#Transparent_proxy";>wikipedia</a>.</div></blockquote> +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="cache_revalidation.html" class="btn btn-neutral float-right" title="Cache Control Headers and Revalidation">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="http_11.html" class="btn btn-neutral" title="HTTP 1.1"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + </p> + </div> + Built with <a href="http://sphinx-doc.org/";>Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme";>theme</a> provided by <a href="https://readthedocs.org";>Read the Docs</a>. + +</footer> + + </div> + </div> + + </section> + + </div> + + + + + + <script 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href="">Content Delivery Networks</a></li> +<li class="toctree-l2"><a class="reference internal" href="http_11.html">HTTP 1.1</a></li> +<li class="toctree-l2"><a class="reference internal" href="caching_proxies.html">Caching Proxies</a></li> +<li class="toctree-l2"><a class="reference internal" href="cache_revalidation.html">Cache Control Headers and Revalidation</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../overview/index.html">Traffic Control Overview</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../overview/introduction.html">Introduction</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_ops.html">Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_router.html">Traffic Router</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_monitor.html">Traffic Monitor</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_stats.html">Traffic Stats</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_portal.html">Traffic Portal</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_server.html">Traffic Server</a></li> +<li class="toctree-l2"><a class="reference internal" href="../overview/traffic_vault.html">Traffic Vault</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../admin/index.html">Administrator’s Guide</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_install.html">Installing Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_config.html">Configuring Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_using.html">Using Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_ops_extensions.html">Managing Traffic Ops Extensions</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_monitor.html">Traffic Monitor Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_router.html">Traffic Router Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_stats.html">Traffic Stats Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_server.html">Traffic Server Administration</a></li> +<li class="toctree-l2"><a class="reference internal" href="../admin/traffic_vault.html">Traffic Vault Administration</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../development/index.html">Developer’s Guide</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_ops.html">Traffic Ops</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_router.html">Traffic Router</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_monitor.html">Traffic Monitor</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_stats.html">Traffic Stats</a></li> +<li class="toctree-l2"><a class="reference internal" href="../development/traffic_server.html">Traffic Server</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../faq/index.html">FAQ</a><ul> +<li class="toctree-l2"><a class="reference internal" href="../faq/general.html">General</a></li> +<li class="toctree-l2"><a class="reference internal" href="../faq/development.html">Development</a></li> +<li class="toctree-l2"><a class="reference internal" href="../faq/administration.html">Running a Traffic Control CDN</a></li> +</ul> +</li> +</ul> +<ul> +<li class="toctree-l1"><a class="reference internal" href="../glossary.html">Glossary</a></li> +</ul> + + + + </div> + + </nav> + + <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"> + + + <nav class="wy-nav-top" role="navigation" aria-label="top navigation"> + <i data-toggle="wy-nav-top" class="fa fa-bars"></i> + <a href="../index.html">Traffic Control</a> + </nav> + + + + <div class="wy-nav-content"> + <div class="rst-content"> + <div role="navigation" aria-label="breadcrumbs navigation"> + <ul class="wy-breadcrumbs"> + <li><a href="../index.html">Traffic Control 1.1.2</a> »</li> + + <li><a href="index.html">CDN Basics</a> »</li> + + <li>Content Delivery Networks</li> + <li class="wy-breadcrumbs-aside"> + + <a href="../_sources/basics/content_delivery_networks.txt" rel="nofollow"> View page source</a> + + </li> + </ul> + <hr/> +</div> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="http_11.html" class="btn btn-neutral float-right" title="HTTP 1.1">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="index.html" class="btn btn-neutral" title="CDN Basics"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + <div role="main" class="document"> + + <div class="section" id="content-delivery-networks"> +<span id="index-0"></span><h1>Content Delivery Networks<a class="headerlink" href="#content-delivery-networks" title="Permalink to this headline">¶</a></h1> +<p>The vast majority of today’s Internet traffic is media files (often video or audio) being sent from a single source (the <em>Content Provider</em>) to many thousands or even millions of destinations (the <em>Content Consumers</em>). Content Delivery Networks are the technology that make that one-to-many distribution possible in an economical way. A Content Delivery Network (CDN) is a distributed system of servers for delivering content over HTTP. These servers are deployed in multiple locations with the goal of optimizing the delivery of content to the end users, while minimizing the traffic on the network. A CDN typically consists of the following:</p> +<ul> +<li><dl class="first docutils"> +<dt><strong>Caching Proxies</strong></dt> +<dd><p class="first last">The proxy (cache or caching proxy) is a server that both proxies the requests and caches the results for reusing.</p> +</dd> +</dl> +</li> +<li><dl class="first docutils"> +<dt><strong>Content Router</strong></dt> +<dd><p class="first last">The Content Router ensures that the end user is connected to the optimal cache for the location of the end user and content availability.</p> +</dd> +</dl> +</li> +<li><dl class="first docutils"> +<dt><strong>Health Protocol</strong></dt> +<dd><p class="first last">The Health Protocol monitors the usage of the caches and tenants in the CDN.</p> +</dd> +</dl> +</li> +<li><dl class="first docutils"> +<dt><strong>Configuration Management System</strong></dt> +<dd><p class="first last">In many cases a CDN encompasses hundreds of servers across a large geographic area. The Configuration Management System allows an operator to manage these servers.</p> +</dd> +</dl> +</li> +<li><dl class="first docutils"> +<dt><strong>Log File Analysis System</strong></dt> +<dd><p class="first last">Every transaction in the CDN gets logged. The Log File Analysis System aggregates all of the log entries from all of the servers to a central location for analysis and troubleshooting.</p> +</dd> +</dl> +</li> +</ul> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="http_11.html" class="btn btn-neutral float-right" title="HTTP 1.1">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="index.html" class="btn btn-neutral" title="CDN Basics"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + </p> + </div> + Built with <a href="http://sphinx-doc.org/";>Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme";>theme</a> provided by <a href="https://readthedocs.org";>Read the Docs</a>. + +</footer> + + </div> + </div> + + </section> + + </div> + + + + + + <script type="text/javascript"> + var DOCUMENTATION_OPTIONS = { + URL_ROOT:'../', + VERSION:'1.1.2', + 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> + + + + + + <script type="text/javascript" src="../_static/js/theme.js"></script> + + + + + <script type="text/javascript"> + jQuery(function () { + SphinxRtdTheme.StickyNav.enable(); + }); + </script> + + +</body> +</html> \ No newline at end of file
