{"id":179101,"date":"2024-04-22T20:29:48","date_gmt":"2024-04-22T19:29:48","guid":{"rendered":"https:\/\/datascientest.com\/en\/?p=179101"},"modified":"2024-02-17T20:45:59","modified_gmt":"2024-02-17T19:45:59","slug":"load-balancers-optimal-resource-distribution","status":"publish","type":"post","link":"https:\/\/datascientest.com\/en\/load-balancers-optimal-resource-distribution","title":{"rendered":"Load Balancers: Optimal Resource Distribution"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"179101\" class=\"elementor elementor-179101\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-12555f5 e-flex e-con-boxed e-con\" data-id=\"12555f5\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ea4cf7b elementor-widget elementor-widget-heading\" data-id=\"ea4cf7b\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h2 class=\"elementor-heading-title elementor-size-default\">The load balancer is a key device that ensures the smooth operation of many digital services. Its mission is to distribute incoming requests between several servers in order to avoid overload and ensure a rapid and efficient response. In other words, it acts like an orchestra conductor directing the flow of traffic through the servers to optimise the use of resources, maximise performance and minimise response times.<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5098702 elementor-widget elementor-widget-text-editor\" data-id=\"5098702\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p>In this article, we take a <a href=\"https:\/\/datascientest.com\/en\/aws-elastic-load-balancer-the-solution-that-distributes-network-traffic\">closer look at this essential technology.<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4fad694 e-flex e-con-boxed e-con\" data-id=\"4fad694\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1430e8f elementor-widget elementor-widget-heading\" data-id=\"1430e8f\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">The different types of load balancer<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bc22b98 elementor-widget elementor-widget-text-editor\" data-id=\"bc22b98\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>A<strong> load balancer<\/strong> can be hardware or software and operate at<a href=\"https:\/\/datascientest.com\/en\/network-load-balancing-nbl-what-is-it-whats-it-for\"> different levels of the network protocol stack.<\/a> Each type has its advantages, disadvantages and optimal use cases. Let&#8217;s look at these in detail.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3a91812 elementor-widget elementor-widget-html\" data-id=\"3a91812\" data-element_type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<figure class=\"tg\" style=\"undefined;table-layout: fixed; width: 800px\">\r\n<colgroup>\r\n<col style=\"width: 30px\">\r\n<col style=\"width: 150px\">\r\n<col style=\"width: 600px\">\r\n<\/colgroup>\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td class=\"tg-0pky\"><img decoding=\"async\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2023\/06\/image4-1.png\" alt=\"Image\" width=\"20\" height=\"20\"><\/td>\r\n<td><strong>Hardware<\/strong><\/td>\r\n<td>These are <strong>physical devices<\/strong> designed to handle <strong>large-scale load balancing<\/strong>. They are typically deployed in a <strong>data center<\/strong> and can handle a <strong>high volume of traffic<\/strong>. They often come with advanced features and offer <strong>high performance<\/strong>, but can be <strong>expensive<\/strong> and <strong>less flexible<\/strong> than their software counterparts.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"tg-0pky\"><img decoding=\"async\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2023\/06\/image1-2.png\" alt=\"Image\" width=\"20\" height=\"20\"><\/td>\r\n<td><strong>Software<\/strong><\/td>\r\n<td>These load balancers are <strong>applications<\/strong> installed on a <strong>server<\/strong>. Generally <strong>less expensive<\/strong> and <strong>more flexible<\/strong> than their hardware counterparts, they can be easily <strong>updated<\/strong> or <strong>modified<\/strong>. However, their <strong>performance<\/strong> may depend on the <strong>resources<\/strong> of the server on which they are installed.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"tg-0pky\"><img decoding=\"async\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2023\/06\/image5-1.png\" alt=\"Image\" width=\"20\" height=\"20\"><\/td>\r\n<td><strong>Layer 4<\/strong><\/td>\r\n<td>A <strong>network-based<\/strong> (or Layer 4) load balancer operates on the <strong>transport layer of the OSI model<\/strong>. It distributes traffic based on source and destination IP addresses, as well as port. While <strong>simpler<\/strong> and <strong>faster<\/strong>, it offers <strong>fewer options<\/strong> for managing traffic <strong>granularly<\/strong>.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"tg-0pky\"><img decoding=\"async\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2023\/06\/image2-2.png\" alt=\"Image\" width=\"20\" height=\"20\"><\/td>\r\n<td><strong>Layer 7<\/strong><\/td>\r\n<td>An <strong>application-based<\/strong> (or Layer 7) load balancer operates on the <strong>application layer of the OSI model<\/strong>. It makes <strong>more complex<\/strong> routing decisions based on the <strong>content of messages<\/strong>, such as URL, cookies, or HTTP headers. This allows it to offer <strong>more sophisticated load balancing<\/strong>, but it is generally <strong>slower<\/strong> than its network-based counterpart.<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"tg-0pky\"><img decoding=\"async\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2023\/06\/image3-2.png\" alt=\"Image\" width=\"20\" height=\"20\"><\/td>\r\n<td><strong>Key Providers<\/strong><\/td>\r\n<td>There are many load balancing solution providers, especially in the cloud domain. Among them are: <ul><li><strong>Amazon Web Services<\/strong>: offers Elastic Load Balancing service, which includes Classic Load Balancer (Layer 4), Application Load Balancer (Layer 7), and Network Load Balancer for very large-scale performance<\/li><li><strong>Google Cloud<\/strong>: provides Google Cloud Load Balancing, a fully distributed and software-based solution<\/li><li><strong>Microsoft Azure<\/strong>: offers Azure Load Balancer (Layer 4) and Azure Application Gateway (Layer 7)<\/li><\/ul><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d2ec10a elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"d2ec10a\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/en\/aws-training\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Understanding how Load Balancers work<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9483392 e-flex e-con-boxed e-con\" data-id=\"9483392\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8263770 elementor-widget elementor-widget-heading\" data-id=\"8263770\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">How do load balancers work?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-87b932f elementor-widget elementor-widget-image\" data-id=\"87b932f\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-image{text-align:center}.elementor-widget-image a{display:inline-block}.elementor-widget-image a img[src$=\".svg\"]{width:48px}.elementor-widget-image img{vertical-align:middle;display:inline-block}<\/style>\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/datascientest.com\/wp-content\/uploads\/2023\/06\/image6.png\" title=\"\" alt=\"\" loading=\"lazy\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Source : nginx.com<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-577cf18 e-flex e-con-boxed e-con\" data-id=\"577cf18\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-eac090e elementor-widget elementor-widget-heading\" data-id=\"eac090e\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">The algorithms used<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-790f7b7 elementor-widget elementor-widget-text-editor\" data-id=\"790f7b7\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>A <strong>load balancer<\/strong> uses different algorithms to determine how incoming traffic should be distributed between servers. Here are some of the most commonly used algorithms:<\/p><ul><li><strong>Round Robin:<\/strong> This is the simplest. It distributes requests cyclically to each server in the list, one at a time.<\/li><li><strong>Least Connections:<\/strong> This algorithm directs new requests to the server with the fewest active connections. This is useful when not all servers have the same capacity.<\/li><li><strong>IP Hash:<\/strong> This uses the origin and destination IP addresses to determine which server to send the request to. This is useful for ensuring session persistence.<\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-357efe6 e-flex e-con-boxed e-con\" data-id=\"357efe6\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6008de0 elementor-widget elementor-widget-heading\" data-id=\"6008de0\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Session management and persistence<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-62d370d elementor-widget elementor-widget-text-editor\" data-id=\"62d370d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>For some applications, it is important that all user requests are directed to the same server for the duration of the session. This is known as &#8220;session persistence&#8221; or &#8220;session affinity&#8221;.<\/p><p>Let&#8217;s take a concrete example. Imagine that you add items to your shopping basket on a merchant site. This information may be stored on a specific server. Now, if your requests are redirected to another server, your basket could appear empty. To avoid this, load balancers use techniques such as cookies or the <strong>IP Hash algorithm<\/strong> to ensure that all your requests go to the same place.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6ae348b e-flex e-con-boxed e-con\" data-id=\"6ae348b\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fcbec42 elementor-widget elementor-widget-heading\" data-id=\"fcbec42\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Load Balancers - Checking the health of servers<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cf9d842 elementor-widget elementor-widget-text-editor\" data-id=\"cf9d842\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>It is imperative that a <strong>load balancer<\/strong> <a href=\"https:\/\/datascientest.com\/en\/aws-kinesis-what-is-this-service-how-much-does-it-cost\">monitors the health of the servers it manages.<\/a> So, if a server is determined to be down or unresponsive, the load balancer stops sending traffic to it until it is up and running again. This ensures that traffic is sent to servers that can handle it, improving the reliability and overall performance of the application.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-edf15e5 e-flex e-con-boxed e-con\" data-id=\"edf15e5\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4ac9d74 elementor-widget elementor-widget-heading\" data-id=\"4ac9d74\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Scalability and high availability<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8d04768 elementor-widget elementor-widget-text-editor\" data-id=\"8d04768\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Another important aspect is their ability to manage scalability and high availability. By continuously monitoring server traffic and performance, a load balancer can help identify when new resources are needed, and ensure continuous service availability by<strong> rerouting traffic<\/strong> in the event of a server failure.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-001a72b e-flex e-con-boxed e-con\" data-id=\"001a72b\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7f79dbc elementor-widget elementor-widget-heading\" data-id=\"7f79dbc\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Conclusion<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6709ef0 elementor-widget elementor-widget-text-editor\" data-id=\"6709ef0\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>We have seen in this article that <strong>load balancers<\/strong> play an essential role in network traffic management. It is therefore clear that they are a crucial component of <a href=\"https:\/\/datascientest.com\/en\/corba-infrastructure-definition-and-benefits\">modern network infrastructure.<\/a><\/p><p>Load balancers contribute to <strong>operational efficiency<\/strong> by intelligently distributing traffic between servers, ensuring session persistence for a better user experience, and monitoring server health for optimum performance and availability.<\/p><p>As our dependence on online applications and services continues to grow, their importance will only increase. It is therefore essential for businesses and IT professionals to understand how they work and how to manage them effectively.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-383e8e4 elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"383e8e4\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/en\/aws-training\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Take an AWS training course<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f900da6 e-flex e-con-boxed e-con\" data-id=\"f900da6\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ef02276 elementor-widget elementor-widget-html\" data-id=\"ef02276\" data-element_type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [{\n    \"@type\": \"Question\",\n    \"name\": \"Session management and persistence\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"For some applications, it is important that all user requests are directed to the same server for the duration of the session. This is known as \"session persistence\" or \"session affinity\".\"\n    }\n  },{\n    \"@type\": \"Question\",\n    \"name\": \"The algorithms used\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"A load balancer uses different algorithms to determine how incoming traffic should be distributed between servers. Here are some of the most commonly used algorithms: Round Robin: This is the simplest. It distributes requests cyclically to each server in the list, one at a time. Least Connections: This algorithm directs new requests to the server with the fewest active connections. This is useful when not all servers have the same capacity. IP Hash: This uses the origin and destination IP addresses to determine which server to send the request to. This is useful for ensuring session persistence.\"\n    }\n  },{\n    \"@type\": \"Question\",\n    \"name\": \"Server health check\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"It is imperative that a load balancer monitors the health of the servers it manages. This means that if a server is determined to be down or unresponsive, the load balancer will stop sending traffic to it until it is up and running again. 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