{"id":579,"date":"2011-09-10T00:00:00","date_gmt":"2011-09-10T00:00:00","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2011\/09\/10\/big-ip-ltm-health-monitors\/"},"modified":"2023-02-04T08:59:07","modified_gmt":"2023-02-04T08:59:07","slug":"big-ip-ltm-health-monitors","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html","title":{"rendered":"Big IP LTM &#8211; Health Monitors"},"content":{"rendered":"<p>A monitor is a test that the LTM can perform on either a node of member. A monitor typically tests for a specific response within a specified time period. BigIP uses the results of this to decide on whether traffic should be sent to the node or pool member.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6622d194edba6\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6622d194edba6\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Types_of_Monitoring\" title=\"Types of Monitoring\">Types of Monitoring<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Address_Check\" title=\"Address Check\">Address Check<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Service_Check\" title=\"Service Check\">Service Check<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Content_Check\" title=\"Content Check\">Content Check<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Interactive_Check\" title=\"Interactive Check\">Interactive Check<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Miscellaneous\" title=\"Miscellaneous\">Miscellaneous<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Creating_Custom_Monitors\" title=\"Creating Custom Monitors\">Creating Custom Monitors<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Associating_a_Monitor\" title=\"Associating a Monitor\">Associating a Monitor<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Nodes\" title=\"Nodes\">Nodes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Pool\" title=\"Pool\">Pool<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Pool_Member\" title=\"Pool Member\">Pool Member<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Status_due_to_monitors\" title=\"Status due to monitors\">Status due to monitors<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Types\" title=\"Types\">Types<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\/#Inheritance\" title=\"Inheritance\">Inheritance<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"Types_of_Monitoring\"><\/span><strong>Types of Monitoring<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>There 4 main types of monitoring:<\/p>\n<ul>\n<li><strong>Address Check<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 &#8211; IP address (Node)<\/li>\n<li><strong>Service Check<\/strong> \u00a0 \u00a0 \u00a0\u00a0 &#8211; IP : port<\/li>\n<li><strong>Content Check<\/strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 &#8211; IP : port &amp; check data returned<\/li>\n<li><strong>Interactive Check<\/strong>\u00a0 &#8211; Interactive with servers. Multiple commands and multiple responses.<\/li>\n<\/ul>\n<h4><span class=\"ez-toc-section\" id=\"Address_Check\"><\/span><strong>Address Check<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>This is the simplest type of check. An example of an address check is ICMP. This is used to ping an IP address and if there is no response within the specified time period the node is marked as down.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Service_Check\"><\/span><strong>Service Check<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Rather then just checking the IP Service Checks monitors the port. This is achieved by issuing a layer 4 connection to the node. The connection is opened and closed. If connection fails, the member is marked as as down and no traffic is distributed to the particular node.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Content_Check\"><\/span><strong>Content Check<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Content Checks check whether the server is also serving the correct content. Once the TCP connection is opened, a command is sent (such as a HTTP GET) and the response is examined and the connection closed. If the connection fails or the received string is not obtained the member is marked as down and no further connections are sent to the member.<\/p>\n<p><em><strong>Note<\/strong><\/em> : It is important that the receive string is not configured using a string that may be also used with any error pages (such as a 404 page), as this would prevent the monitor from correctly marking the the member as offline.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Interactive_Check\"><\/span><strong>Interactive Check<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Protocols such as FTP require interactive checks as additional commands such as username, password and directory are typically required.<br \/>\nTypically Interactive Checks consist of a TCP connection that is opened, command(s) are then sent, the responses examined and the connection closed.<br \/>\nIf any condition fails the member is marked as down and no further connections are sent to the member.<\/p>\n<p><em><strong>Note<\/strong><\/em> : Most interactive checks are external monitors. External monitors external scripts (perl, shell etc) that the LTM calls to perform the required tests (and to aggregate the results).<\/p>\n<p>Below describes the various interactive checks available:<strong><br \/>\n<\/strong><\/p>\n<p><strong>Scripted Monitors<\/strong> &#8211; Scripted Monitors use the Expect method\/&#8221;model&#8221; (send\/expect) to determine a nodes health. Expect is a UNIX binary that sends a command and then expects are specific response back.<br \/>\n<strong>External Monitors<\/strong> &#8211; External Monitors are custom shell scripts that can be created to determine the health of a node.<br \/>\n<strong>Performance Monitors<\/strong> &#8211; As the name suggests Performance monitors deem the nodes health by querying the nodes performance. There are a number of methods in which this can be achieved. These are :<br \/>\n<strong>\u00a0\u00a0 &#8211; Dynamic Ratio LoadBalancing<\/strong> &#8211; Dynamic Ratio Load-Balancing queries the given agent on either a RealNetwork RealServer, WMI or SNMP based platform to determine a ratio value. This ratio value is then dynamically assigned to the node.<br \/>\n<strong>\u00a0\u00a0 &#8211; SNMP DCA<\/strong> &#8211; SNMP DCA determines performance via the data collected from the nodes SNMP agent.<br \/>\n<strong>\u00a0\u00a0 &#8211; SNMP DCA Base<\/strong> &#8211;\u00a0SNMP DCA determines performance via<em> only the user-data<\/em> collected from the nodes SNMP agent.<br \/>\n<strong>\u00a0\u00a0 &#8211; WMI<\/strong> &#8211; WMI determines performance via the data collected from the nodes WMI agent.<\/p>\n<div class=\"gbt\">\n<h4 class=\"gbgt\"><span class=\"ez-toc-section\" id=\"Miscellaneous\"><\/span><strong>Miscellaneous<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<\/div>\n<p><strong>Inband Passive Monitor<\/strong> &#8211; Rather than issue a connection to the server to determine its health, Inband Passive Monitors determine the health of the node by the monitoring of actual traffic being sent to and from the node. The main benefit of this monitor is that it requires little system resource. However as Passive monitors can also be slow to bring pools members back online it is recommended that they are used in conjunction with Active Monitors via the use of the Active Monitor option &#8220;Check Until Up&#8221;.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Creating_Custom_Monitors\"><\/span><strong>Creating Custom Monitors<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Below shows the steps required to create a custom monitor:<\/p>\n<ol>\n<li>Go to &#8216;Local Traffic | Monitors | Create&#8217;.<\/li>\n<li>Add the Name and select a template from the Type drop down menu.<\/li>\n<li>Then define the Interval and Timeout.<\/li>\n<\/ol>\n<p><em><strong>Note :<\/strong><\/em><\/p>\n<p><strong>Interval<\/strong> &#8211; Interval between checks.<br \/>\n<strong>Timeout<\/strong> &#8211; Defines how long F5 should wait before marking a node\/member as down.<br \/>\n<strong>Recommended Setting<\/strong> &#8211; Timeout = (3 x Interval) + 1 sec.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Associating_a_Monitor\"><\/span><strong>Associating a Monitor<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"Nodes\"><\/span><strong>Nodes<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>To assign a monitor :<\/p>\n<ol>\n<li><strong>Default <\/strong>: Go to &#8216;Local Traffic | Nodes | Default Monitor&#8217; then define the active health monitor.<\/li>\n<li><strong>Single Node<\/strong> : To set a monitor to one node go to &#8216;Local Traffic | Nodes | Node List&#8217; and select the node. Then from the Health Monitor drop down select the monitor.<\/li>\n<\/ol>\n<h4><span class=\"ez-toc-section\" id=\"Pool\"><\/span><strong>Pool<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>To assign a monitor to a pool.<\/p>\n<ol>\n<li>Go to &#8216;Local Traffic | Pools&#8217; and select the pool.<\/li>\n<li>Within the configuration screen select the Health Monitor.<\/li>\n<\/ol>\n<h4><span class=\"ez-toc-section\" id=\"Pool_Member\"><\/span><strong>Pool Member<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ol>\n<li>Go to &#8216;Traffic | Pools&#8217; and select the Pool.<\/li>\n<li>Then select the individual member.<\/li>\n<li>Within the Configuration screen select Advanced.<\/li>\n<li>Under Health Monitor select Member Specific and then select the necessary monitor.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Status_due_to_monitors\"><\/span><strong>Status due to monitors<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"Types\"><\/span><strong>Types<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>There are 4 main status types (with regards to monitors). These are :<\/p>\n<ul>\n<li><strong>Up \/ Available<\/strong> &#8211; Means the most recent monitor check was successful.<\/li>\n<li><strong>Down \/ Offline<\/strong> &#8211; Means no response equal to the configured timeout period.<\/li>\n<li><strong>Unknown<\/strong> &#8211; Typically means no monitor is assigned nor the monitor has yet to return a result.<\/li>\n<li><strong>Connection Limit \/ Unavailable<\/strong> &#8211; Previously defined connection limit has been reached. In turn no traffic is sent.<\/li>\n<\/ul>\n<h4><span class=\"ez-toc-section\" id=\"Inheritance\"><\/span><strong>Inheritance<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>The status of each monitor is inherited from its children.<br \/>\nIf a node is marked offline, then the member is marked offline. As long as there are other members still online in the pool the Pool would still be marked as up.<\/p>\n<p><picture><source srcset=\"https:\/\/www.fir3net.com\/wp-content\/uploads\/2011\/09\/images_legacy_f5monstatus-diag.avif 308w,https:\/\/www.fir3net.com\/wp-content\/uploads\/2011\/09\/images_legacy_f5monstatus-diag-300x240.avif 300w\" sizes=\"(max-width: 308px) 100vw, 308px\" type=\"image\/avif\"><source srcset=\"https:\/\/www.fir3net.com\/wp-content\/uploads\/2011\/09\/images_legacy_f5monstatus-diag.webp 308w,https:\/\/www.fir3net.com\/wp-content\/uploads\/2011\/09\/images_legacy_f5monstatus-diag-300x240.webp 300w\" sizes=\"(max-width: 308px) 100vw, 308px\" type=\"image\/webp\"><img src=\"https:\/\/www.fir3net.com\/wp-content\/uploads\/2011\/09\/images_legacy_f5monstatus-diag.jpg\" height=\"246\" width=\"308\" srcset=\"https:\/\/www.fir3net.com\/wp-content\/uploads\/2011\/09\/images_legacy_f5monstatus-diag.jpg 308w, https:\/\/www.fir3net.com\/wp-content\/uploads\/2011\/09\/images_legacy_f5monstatus-diag-300x240.jpg 300w\" sizes=\"(max-width: 308px) 100vw, 308px\" class=\"alignnone wp-image-578 size-full sp-no-webp\" alt=\"Big IP LTM - Health Monitors\" loading=\"lazy\" decoding=\"async\" style=\"display: block; margin-left: auto; margin-right: auto;\"  > <\/picture><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A monitor is a test that the LTM can perform on either a node of member. A monitor typically tests for a specific response within a specified time period. BigIP uses the results of this to decide on whether traffic should be sent to the node or pool member. Types of Monitoring There 4 main &#8230; <a title=\"Big IP LTM &#8211; Health Monitors\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/big-ip-ltm-health-monitors.html\" aria-label=\"Read more about Big IP LTM &#8211; Health Monitors\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":577,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Big IP LTM - Health Monitors - Fir3net<\/title>\n<meta name=\"description\" content=\"A monitor is a test that the LTM can perform on either a node of member. 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