{"id":9480,"date":"2022-04-21T00:47:08","date_gmt":"2022-04-21T04:47:08","guid":{"rendered":"https:\/\/www.redline13.com\/blog\/?post_type=docs&#038;p=9480"},"modified":"2022-07-29T07:45:38","modified_gmt":"2022-07-29T11:45:38","password":"","slug":"log-replay-tests","status":"publish","type":"docs","link":"https:\/\/www.redline13.com\/blog\/docs\/log-replay-tests\/","title":{"rendered":"Log Replay Tests"},"content":{"rendered":"\n<p>The usual purpose for log files is to serve as repository for historical events, and often handy when trying to debug complex problems.  However, an additional use that log files can be used as a source of events, to &#8220;replay&#8221; a past scenario.  In particular, the log files from a web server contain enough information (time, URL, <em>etc<\/em>.) to reconstruct a series of requests over time.  With RedLine13 and &#8220;<em>Log Replay<\/em>&#8221; tests, you can use these log files to drive your load tests.  In addition, you can run as many load generator instances as desired to scale your log replay test to nearly any level.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Getting Started<\/h3>\n\n\n\n<p>To run a Log Replay test on RedLine13, begin by logging into your account, clicking &#8220;<em>Start Test<\/em>&#8220;, and then navigating to the &#8220;<em>Log Replay Test<\/em>&#8221; tab:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/07\/log_replay_test-1024x130.png\" alt=\"Selecting the Log Replay test type\" class=\"wp-image-9896\" width=\"512\" height=\"65\" srcset=\"https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/07\/log_replay_test-1024x130.png 1024w, https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/07\/log_replay_test-300x38.png 300w, https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/07\/log_replay_test-768x98.png 768w, https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/07\/log_replay_test-425x54.png 425w, https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/07\/log_replay_test.png 1061w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><figcaption>Select \u201c<em>Log Replay Test<\/em>\u201d from the available test types.<\/figcaption><\/figure><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Running Your First Log Replay Test<\/h3>\n\n\n\n<p>To successfully run a log replay load test, you will need at a minimum the following information:<\/p>\n\n\n\n<ul class=\"wp-block-list\" id=\"block-0b4e9902-f911-4974-b5a5-651249b67ab9\"><li><strong>Base URL<\/strong><br><a href=\"https:\/\/httpd.apache.org\/docs\" target=\"_blank\" rel=\"noreferrer noopener\">Apache<\/a> and <a href=\"https:\/\/nginx.org\/en\/docs\" target=\"_blank\" rel=\"noreferrer noopener\">NGINX<\/a> log files will contain relative paths. You will need to specify a <em>Base URL<\/em> as this will not be contained within the useful portions of the log file.<br><\/li><li><strong>Log File<\/strong><br>You may upload your entire log file, or in a more likely scenario a sample from your log file. There are upload limits for attaching extra files with your test (which are described on our <a href=\"https:\/\/www.redline13.com\/blog\/2022\/02\/redline13-pricing-features\/\" target=\"_blank\" rel=\"noreferrer noopener\">pricing and features<\/a> page). This is uploaded within the &#8220;<em>Access Log<\/em>&#8221; field when creating your load test.<br><\/li><li><strong>Log File Pattern<\/strong><br>It is crucial that the <em>Log File Pattern<\/em> matches the data entries within your log file. When you select a test type, this will prepopulate with a default pattern, but you must check and potentially modify this in accordance with the <em>Log Format Descriptions<\/em> listed below.<br><\/li><li><strong>Scaling Basics<\/strong><br>We provide some default values for fields such as <em>Number of Users<\/em> and <em>Iterations per User<\/em>, however these are fields that you will likely want to configure to adjust how much load your test should generate.<br><\/li><li><strong>Advanced Cloud Options<\/strong><br>For larger tests and for finer control over resource allocation, you can expand the &#8220;<em>Advanced Cloud Options<\/em>&#8221; section which will allow you to specify number of servers, instance size, and other cloud configuration options.<\/li><\/ul>\n\n\n\n<p>You can initiate your test by going through the following steps:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>First make sure you have your\u00a0<a href=\"https:\/\/www.redline13.com\/blog\/docs\/integrating-aws-with-redline13\/\">AWS credentials configured<\/a>\u00a0properly. This is not an absolute prerequisite; however, it will allow you to configure load generator server sizes for your test.<\/li><li>Specify a test configuration by filling out the required fields from the list above.<\/li><li>Name your test.<\/li><li>Click on \u201c<em>Start Test<\/em>\u201c.<\/li><\/ol>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/05\/Log-Replay-Test-Options-1024x309.png\" alt=\"Basic parameters for a log replay test.\" class=\"wp-image-9597\" width=\"-142\" height=\"-43\" srcset=\"https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/05\/Log-Replay-Test-Options-1024x309.png 1024w, https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/05\/Log-Replay-Test-Options-300x91.png 300w, https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/05\/Log-Replay-Test-Options-768x232.png 768w, https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/05\/Log-Replay-Test-Options-1536x464.png 1536w, https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/05\/Log-Replay-Test-Options-425x128.png 425w, https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/05\/Log-Replay-Test-Options.png 1877w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption>The basic parameters necessary for running a log replay test are depicted above.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Viewing Results for Your Test<\/h3>\n\n\n\n<p>As your test begins, real time results will be displayed on the load test results page. These tables and graphs will update and finalize at the conclusion of your test. In addition to this, a test summary will be displayed after your test completes containing the most pertinent test information. Below is an example which is also covered in our documentation in more detail under \u201c<em><a href=\"https:\/\/www.redline13.com\/blog\/docs\/test-summary\/\">Test Summary<\/a><\/em>\u201c:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/06\/test-summary-1024x383.png\" alt=\"RedLine13 load test summary section\" class=\"wp-image-9850\" width=\"768\" height=\"287\" srcset=\"https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/06\/test-summary-1024x383.png 1024w, https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/06\/test-summary-300x112.png 300w, https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/06\/test-summary-768x288.png 768w, https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/06\/test-summary-425x159.png 425w, https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/06\/test-summary.png 1290w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><figcaption>RedLine13 load test \u201c<em>Summary<\/em>\u201d section. In this particular example, the calculation of&nbsp;<em><a href=\"https:\/\/www.redline13.com\/blog\/docs\/percentiles\/\">percentiles<\/a><\/em>&nbsp;has been enabled.<\/figcaption><\/figure><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Field Descriptions<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Field<\/strong><\/td><td><strong>Description<\/strong><\/td><\/tr><tr><td>Base URL<\/td><td>The base URL which is preprended to all requests found in the log file.  (Log files do not tell us the sites URL.)<\/td><\/tr><tr><td>Access Log<\/td><td>The log file to parse, which can be Apache, NGINX, or in a plain list format.  RedLine13 currently uses all the GET requests to generate traffic.<\/td><\/tr><tr><td>Log File Template<\/td><td>This is not a required field, however selecting Apache or NGNIX will populate the pattern with the default for Apache or NGINX.<\/td><\/tr><tr><td>Log File Pattern<\/td><td>The pattern to use to parse the request.  The patterns available are defined below and in the open-source log file parser.<\/td><\/tr><tr><td>Number of Users<\/td><td>This will be the number of users to simulate in total across your cloud servers.  Each user will simulate the entire log file, at least once.  You may also set iterations per user as described below.<\/td><\/tr><tr><td>Iterations Per User<\/td><td>The number of iterations per user to simulate the entire log file.<\/td><\/tr><tr><td>Ramp up Time<\/td><td>This can be specified as the time to ramp up the users, otherwise they all start at the same time.  We evenly ramp up the users based on the time specified per cloud server.<\/td><\/tr><tr><td>Minimum Delay<\/td><td>For each request within the log file what is the minimum time to wait before making the http or https request.<\/td><\/tr><tr><td>Maximum Delay<\/td><td>For each request within the log file what is the maximum time to wait before making the http or https request.<\/td><\/tr><tr><td>Save Response and Percentiles<\/td><td>This checkbox has two actions.  The first is to save the response output, as we capture the content from the request.  The second is to calculate performance percentiles after the test completes.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Log Format Descriptions<\/h3>\n\n\n\n<p>The formatting conventions we use for parsing log files is based on the open-source <a href=\"https:\/\/github.com\/redline13\/log-parser\">Log File Parser<\/a> project which you can find on GitHub by following the link.  This is based off a log parser written by Rafael Kassner which is also <a href=\"https:\/\/github.com\/kassner\/log-parser\" target=\"_blank\" rel=\"noreferrer noopener\">available on GitHub here<\/a>.  Default patterns for Apache and NGINX are as follows:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Apache<\/strong><\/td><td>%h %l %u %t \u201c%r\u201d %&gt;s %b<\/td><\/tr><tr><td><strong>NGINX<\/strong><\/td><td>%h %l %u %t \u201c%r\u201d %&gt;s %O \u201c%{Referrer}i\u201d \u201c%{User-Agent}i\u201d<\/td><\/tr><\/tbody><\/table><figcaption>Default log file patterns which are automatically applied with the corresponding selection.  It is up to the user to modify these patterns to match the actual configuration within the supplied log file sample.<\/figcaption><\/figure>\n\n\n\n<p>For Apache log files, the following formatting expressions apply:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>%h<\/td><td>The http or https host.<\/td><\/tr><tr><td>%l<\/td><td>Log name.<\/td><\/tr><tr><td>%u<\/td><td>The request user.<\/td><\/tr><tr><td>%t<\/td><td>The request time.<\/td><\/tr><tr><td>&#8220;%r&#8221;<\/td><td>The actual request, which is wrapped in quotes.<\/td><\/tr><tr><td>%&gt;s<\/td><td>Status, but multiple statuses can be read at this point.<\/td><\/tr><tr><td>%b<\/td><td>Response bytes.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>For NGINX log files, the following formatting expressions apply:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>%h<\/td><td> The http or https host. <\/td><\/tr><tr><td>%l<\/td><td> Log name. <\/td><\/tr><tr><td>%u<\/td><td> The request user. <\/td><\/tr><tr><td>%t<\/td><td> The request time. <\/td><\/tr><tr><td>&#8220;%r&#8221;<\/td><td> The actual request, which is wrapped in quotes. <\/td><\/tr><tr><td>%&gt;s<\/td><td> Status, but multiple statuses can be read at this point. <\/td><\/tr><tr><td>%O<\/td><td>Response bytes sent.<\/td><\/tr><tr><td>&#8220;%{Referrer}i&#8221;<\/td><td>%{\u2026}i will be a header that was written to the log file, in this case the <em>referrer<\/em>.<\/td><\/tr><tr><td>&#8220;%{User-Agent}i&#8221;<\/td><td>The user-agent header which is expected in the log file.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Log File Sample<\/h3>\n\n\n\n<p>Using the above <a href=\"https:\/\/www.redline13.com\/blog\/docs\/log-replay-tests\/#1-toc-title\">log format descriptions<\/a>, we can consider the following log file sample.  In this case the log excerpt has come from an NGINX log:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>192.168.99.1 - - &#91;02\/Apr\/2016:23:38:56 +0000] \"GET \/favicon.ico HTTP\/1.1\" 404 209 \"https:\/\/192.168.99.101\/\" \"Mozilla\/5.0 (Macintosh; Intel Mac OS X 10_11_0) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/51.0.2695.1 Safari\/537.36\"<\/code><\/pre>\n\n\n\n<p>This makes it easier to visualize where the above expressions will extract their corresponding data from each line within the log file.  For instance, &#8220;<em>%h<\/em>&#8221; for the host would correspond to &#8220;<em>https:\/\/192.168.99.101\/<\/em>&#8220;, whereas &#8220;%t&#8221; for the request time would correspond to &#8220;<em>[02\/Apr\/2016:23:38:56 +0000]<\/em>&#8220;, <em>etc<\/em>.  Each line within the log file will be attempted for parsing as a single request.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The usual purpose for log files is to serve as repository for historical events, and often handy when trying to debug complex problems. However, an additional use that log files can be used as a source of events, to &#8220;replay&#8221; a past scenario. In particular, the log files from a web server contain enough information (time, URL, etc.) to reconstruct a series of requests over time. With RedLine13 and &#8220;Log Replay&#8221; tests, you can use these<a class=\"more-link\" href=\"https:\/\/www.redline13.com\/blog\/docs\/log-replay-tests\/\">Read More &rarr;<\/a><\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"doc_category":[579],"doc_tag":[],"class_list":{"0":"entry","1":"docs","2":"publish","3":"author-dkoziel","4":"post-9480","6":"doc_category-different-types-of-tests"},"year_month":"2026-05","word_count":1147,"total_views":0,"reactions":{"happy":0,"normal":0,"sad":0},"author_info":{"name":"David Koziel","author_nicename":"dkoziel","author_url":"https:\/\/www.redline13.com\/blog\/author\/dkoziel\/"},"doc_category_info":[{"term_name":"Different Types of Tests","term_url":"https:\/\/www.redline13.com\/blog\/docs-category\/different-types-of-tests\/"}],"doc_tag_info":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.12 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Log Replay Tests - RedLine13<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.redline13.com\/blog\/docs\/log-replay-tests\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Log Replay Tests - RedLine13\" \/>\n<meta property=\"og:description\" content=\"The usual purpose for log files is to serve as repository for historical events, and often handy when trying to debug complex problems. However, an additional use that log files can be used as a source of events, to &#8220;replay&#8221; a past scenario. In particular, the log files from a web server contain enough information (time, URL, etc.) to reconstruct a series of requests over time. 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However, an additional use that log files can be used as a source of events, to &#8220;replay&#8221; a past scenario. In particular, the log files from a web server contain enough information (time, URL, etc.) to reconstruct a series of requests over time. With RedLine13 and &#8220;Log Replay&#8221; tests, you can use theseRead More &rarr;","og_url":"https:\/\/www.redline13.com\/blog\/docs\/log-replay-tests\/","og_site_name":"RedLine13","article_modified_time":"2022-07-29T11:45:38+00:00","og_image":[{"url":"https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2022\/07\/log_replay_test-1024x130.png"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"6 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.redline13.com\/blog\/docs\/log-replay-tests\/","url":"https:\/\/www.redline13.com\/blog\/docs\/log-replay-tests\/","name":"Log Replay Tests - RedLine13","isPartOf":{"@id":"https:\/\/www.redline13.com\/blog\/#website"},"datePublished":"2022-04-21T04:47:08+00:00","dateModified":"2022-07-29T11:45:38+00:00","breadcrumb":{"@id":"https:\/\/www.redline13.com\/blog\/docs\/log-replay-tests\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.redline13.com\/blog\/docs\/log-replay-tests\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.redline13.com\/blog\/docs\/log-replay-tests\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.redline13.com\/blog\/"},{"@type":"ListItem","position":2,"name":"Docs","item":"https:\/\/www.redline13.com\/blog\/docs\/"},{"@type":"ListItem","position":3,"name":"Log Replay Tests"}]},{"@type":"WebSite","@id":"https:\/\/www.redline13.com\/blog\/#website","url":"https:\/\/www.redline13.com\/blog\/","name":"RedLine13","description":"(Almost) Free Load Testing in the Cloud","publisher":{"@id":"https:\/\/www.redline13.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.redline13.com\/blog\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.redline13.com\/blog\/#organization","name":"RedLine13","url":"https:\/\/www.redline13.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.redline13.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2013\/06\/cropped-rl13-header-logo.jpg","contentUrl":"https:\/\/www.redline13.com\/blog\/wp-content\/uploads\/2013\/06\/cropped-rl13-header-logo.jpg","width":300,"height":68,"caption":"RedLine13"},"image":{"@id":"https:\/\/www.redline13.com\/blog\/#\/schema\/logo\/image\/"}}]}},"_links":{"self":[{"href":"https:\/\/www.redline13.com\/blog\/wp-json\/wp\/v2\/docs\/9480","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.redline13.com\/blog\/wp-json\/wp\/v2\/docs"}],"about":[{"href":"https:\/\/www.redline13.com\/blog\/wp-json\/wp\/v2\/types\/docs"}],"author":[{"embeddable":true,"href":"https:\/\/www.redline13.com\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/www.redline13.com\/blog\/wp-json\/wp\/v2\/comments?post=9480"}],"version-history":[{"count":21,"href":"https:\/\/www.redline13.com\/blog\/wp-json\/wp\/v2\/docs\/9480\/revisions"}],"predecessor-version":[{"id":9901,"href":"https:\/\/www.redline13.com\/blog\/wp-json\/wp\/v2\/docs\/9480\/revisions\/9901"}],"wp:attachment":[{"href":"https:\/\/www.redline13.com\/blog\/wp-json\/wp\/v2\/media?parent=9480"}],"wp:term":[{"taxonomy":"doc_category","embeddable":true,"href":"https:\/\/www.redline13.com\/blog\/wp-json\/wp\/v2\/doc_category?post=9480"},{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/www.redline13.com\/blog\/wp-json\/wp\/v2\/doc_tag?post=9480"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}