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diff --git a/v1.56/opentracing.html b/v1.56/opentracing.html new file mode 100644 index 0000000000..5dcbd74f21 --- /dev/null +++ b/v1.56/opentracing.html @@ -0,0 +1,328 @@ +<!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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href="development/database_schema.html">Database Schemas</a></li><li class="chapter-item expanded "><a href="development/experimental_features.html">Experimental features</a></li><li class="chapter-item expanded "><div>Synapse Architecture</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="log_contexts.html">Log Contexts</a></li><li class="chapter-item expanded "><a href="replication.html">Replication</a></li><li class="chapter-item expanded "><a href="tcp_replication.html">TCP Replication</a></li></ol></li><li class="chapter-item expanded "><a href="development/internal_documentation/index.html">Internal Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single Sign-On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="development/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="development/cas.html">CAS</a></li></ol></li><li class="chapter-item expanded "><a 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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 uncommenting the config options under <code>opentracing</code> +as shown in the <a href="./sample_config.yaml">sample config</a>. For example:</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 |