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diff --git a/v1.91.0/opentracing.html b/v1.91.0/opentracing.html new file mode 100644 index 0000000000..d7a8a401f1 --- /dev/null +++ b/v1.91.0/opentracing.html @@ -0,0 +1,263 @@ +<!DOCTYPE HTML> +<html lang="en" class="sidebar-visible no-js light"> + <head> + <!-- Book generated using mdBook --> + <meta charset="UTF-8"> + <title>OpenTracing - Synapse</title> + <!-- Custom HTML head --> + <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> + <meta name="description" content=""> + <meta name="viewport" content="width=device-width, initial-scale=1"> + <meta name="theme-color" content="#ffffff" /> + + <link rel="icon" href="favicon.svg"> + <link rel="shortcut icon" href="favicon.png"> + <link rel="stylesheet" href="css/variables.css"> + <link rel="stylesheet" href="css/general.css"> + <link rel="stylesheet" href="css/chrome.css"> + <link rel="stylesheet" href="css/print.css" media="print"> + <!-- Fonts --> + <link rel="stylesheet" href="FontAwesome/css/font-awesome.css"> + <link rel="stylesheet" href="fonts/fonts.css"> + <!-- Highlight.js Stylesheets --> + <link rel="stylesheet" href="highlight.css"> + <link rel="stylesheet" href="tomorrow-night.css"> + <link rel="stylesheet" href="ayu-highlight.css"> + + <!-- Custom theme stylesheets --> + <link rel="stylesheet" href="docs/website_files/table-of-contents.css"> + <link rel="stylesheet" href="docs/website_files/remove-nav-buttons.css"> + <link rel="stylesheet" href="docs/website_files/indent-section-headers.css"> + </head> + <body> + <!-- Provide site root to javascript --> + <script type="text/javascript"> + var path_to_root = ""; + var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? 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Policy</a></li><li class="chapter-item expanded "><a href="other/running_synapse_on_single_board_computers.html">Running Synapse on a Single-Board Computer</a></li></ol> + </div> + <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div> + </nav> + + <div id="page-wrapper" class="page-wrapper"> + + <div class="page"> + <div id="menu-bar-hover-placeholder"></div> + <div id="menu-bar" class="menu-bar sticky bordered"> + <div class="left-buttons"> + <button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar"> + <i class="fa fa-bars"></i> + </button> + <button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list"> + <i class="fa fa-paint-brush"></i> + </button> + <ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu"> + <li role="none"><button 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(Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar"> + <i class="fa fa-search"></i> + </button> + </div> + + <h1 class="menu-title">Synapse</h1> + + <div class="right-buttons"> + <a href="print.html" title="Print this book" aria-label="Print this book"> + <i id="print-button" class="fa fa-print"></i> + </a> + <a href="https://github.com/matrix-org/synapse" title="Git repository" aria-label="Git repository"> + <i id="git-repository-button" class="fa fa-github"></i> + </a> + <a href="https://github.com/matrix-org/synapse/edit/develop/docs/opentracing.md" title="Suggest an edit" aria-label="Suggest an edit"> + <i id="git-edit-button" class="fa fa-edit"></i> + </a> + </div> + </div> + + <div id="search-wrapper" class="hidden"> + <form id="searchbar-outer" class="searchbar-outer"> + <input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header"> + </form> + <div id="searchresults-outer" class="searchresults-outer hidden"> + <div id="searchresults-header" class="searchresults-header"></div> + <ul id="searchresults"> + </ul> + </div> + </div> + <!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM --> + <script type="text/javascript"> + document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible'); + document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible'); + Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) { + link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1); + }); + </script> + + <div id="content" class="content"> + <main> + <!-- Page table of contents --> + <div class="sidetoc"> + <nav class="pagetoc"></nav> + </div> + + <h1 id="opentracing"><a class="header" href="#opentracing">OpenTracing</a></h1> +<h2 id="background"><a class="header" href="#background">Background</a></h2> +<p>OpenTracing is a semi-standard being adopted by a number of distributed +tracing platforms. It is a common api for facilitating vendor-agnostic +tracing instrumentation. That is, we can use the OpenTracing api and +select one of a number of tracer implementations to do the heavy lifting +in the background. Our current selected implementation is Jaeger.</p> +<p>OpenTracing is a tool which gives an insight into the causal +relationship of work done in and between servers. The servers each track +events and report them to a centralised server - in Synapse's case: +Jaeger. The basic unit used to represent events is the span. The span +roughly represents a single piece of work that was done and the time at +which it occurred. A span can have child spans, meaning that the work of +the child had to be completed for the parent span to complete, or it can +have follow-on spans which represent work that is undertaken as a result +of the parent but is not depended on by the parent to in order to +finish.</p> +<p>Since this is undertaken in a distributed environment a request to +another server, such as an RPC or a simple GET, can be considered a span +(a unit or work) for the local server. This causal link is what +OpenTracing aims to capture and visualise. In order to do this metadata +about the local server's span, i.e the 'span context', needs to be +included with the request to the remote.</p> +<p>It is up to the remote server to decide what it does with the spans it +creates. This is called the sampling policy and it can be configured +through Jaeger's settings.</p> +<p>For OpenTracing concepts see +<a href="https://opentracing.io/docs/overview/what-is-tracing/">https://opentracing.io/docs/overview/what-is-tracing/</a>.</p> +<p>For more information about Jaeger's implementation see +<a href="https://www.jaegertracing.io/docs/">https://www.jaegertracing.io/docs/</a></p> +<h2 id="setting-up-opentracing"><a class="header" href="#setting-up-opentracing">Setting up OpenTracing</a></h2> +<p>To receive OpenTracing spans, start up a Jaeger server. This can be done +using docker like so:</p> +<pre><code class="language-sh">docker run -d --name jaeger \ + -p 6831:6831/udp \ + -p 6832:6832/udp \ + -p 5778:5778 \ + -p 16686:16686 \ + -p 14268:14268 \ + jaegertracing/all-in-one:1 +</code></pre> +<p>Latest documentation is probably at +https://www.jaegertracing.io/docs/latest/getting-started.</p> +<h2 id="enable-opentracing-in-synapse"><a class="header" href="#enable-opentracing-in-synapse">Enable OpenTracing in Synapse</a></h2> +<p>OpenTracing is not enabled by default. It must be enabled in the +homeserver config by adding the <code>opentracing</code> option to your config file. You can find +documentation about how to do this in the <a href="usage/configuration/config_documentation.html#opentracing">config manual under the header 'Opentracing'</a>. +See below for an example Opentracing configuration: </p> +<pre><code class="language-yaml">opentracing: + enabled: true + homeserver_whitelist: + - "mytrustedhomeserver.org" + - "*.myotherhomeservers.com" +</code></pre> +<h2 id="homeserver-whitelisting"><a class="header" href="#homeserver-whitelisting">Homeserver whitelisting</a></h2> +<p>The homeserver whitelist is configured using regular expressions. A list +of regular expressions can be given and their union will be compared +when propagating any spans contexts to another homeserver.</p> +<p>Though it's mostly safe to send and receive span contexts to and from +untrusted users since span contexts are usually opaque ids it can lead +to two problems, namely:</p> +<ul> +<li>If the span context is marked as sampled by the sending homeserver +the receiver will sample it. Therefore two homeservers with wildly +different sampling policies could incur higher sampling counts than +intended.</li> +<li>Sending servers can attach arbitrary data to spans, known as +'baggage'. For safety this has been disabled in Synapse but that +doesn't prevent another server sending you baggage which will be +logged to OpenTracing's logs.</li> +</ul> +<h2 id="configuring-jaeger"><a class="header" href="#configuring-jaeger">Configuring Jaeger</a></h2> +<p>Sampling strategies can be set as in this document: +<a href="https://www.jaegertracing.io/docs/latest/sampling/">https://www.jaegertracing.io/docs/latest/sampling/</a>.</p> + + </main> + + <nav class="nav-wrapper" aria-label="Page navigation"> + <!-- Mobile navigation buttons --> + <a rel="prev" href="development/demo.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + <a rel="next" href="development/database_schema.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + <div style="clear: both"></div> + </nav> + </div> + </div> + + <nav class="nav-wide-wrapper" aria-label="Page navigation"> + <a rel="prev" href="development/demo.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + <a rel="next" href="development/database_schema.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + </nav> + + </div> + + <script type="text/javascript"> + window.playground_copyable = true; + </script> + <script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script> + <script src="mark.min.js" type="text/javascript" charset="utf-8"></script> + <script src="searcher.js" type="text/javascript" charset="utf-8"></script> + <script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script> + <script src="highlight.js" type="text/javascript" charset="utf-8"></script> + <script src="book.js" type="text/javascript" charset="utf-8"></script> + + <!-- Custom JS scripts --> + <script type="text/javascript" src="docs/website_files/table-of-contents.js"></script> + </body> +</html> \ No newline at end of file |