{"id":822,"date":"2014-01-01T00:00:00","date_gmt":"2014-01-01T00:00:00","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2014\/01\/01\/f5-ltm-using-qpersist-uie-addq-with-the-node-command-in-an-irule-causes-rst\/"},"modified":"2021-08-01T01:22:25","modified_gmt":"2021-08-01T01:22:25","slug":"f5-ltm-using-qpersist-uie-addq-with-the-node-command-in-an-irule-causes-rst","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/f5-ltm-using-qpersist-uie-addq-with-the-node-command-in-an-irule-causes-rst.html","title":{"rendered":"F5 LTM (Deep Dive) &#8211; Using &#8216;persist uie add&#8217; with the &#8216;node&#8217; command in an iRule causes the F5 to send a RST"},"content":{"rendered":"<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-6626517acc081\" 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-6626517acc081\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/f5-ltm-using-qpersist-uie-addq-with-the-node-command-in-an-irule-causes-rst.html\/#Problem\" title=\"Problem\">Problem<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/f5-ltm-using-qpersist-uie-addq-with-the-node-command-in-an-irule-causes-rst.html\/#Background\" title=\"Background\">Background<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/f5-ltm-using-qpersist-uie-addq-with-the-node-command-in-an-irule-causes-rst.html\/#Configuration\" title=\"Configuration\">Configuration<\/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\/f5-ltm-using-qpersist-uie-addq-with-the-node-command-in-an-irule-causes-rst.html\/#Behaviour\" title=\"Behaviour\">Behaviour<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/f5-ltm-using-qpersist-uie-addq-with-the-node-command-in-an-irule-causes-rst.html\/#Reason\" title=\"Reason\">Reason<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/f5-ltm-using-qpersist-uie-addq-with-the-node-command-in-an-irule-causes-rst.html\/#Solution\" title=\"Solution\">Solution<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Problem\"><\/span><strong>Problem<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When using the command &#8220;persist uie add&#8221; in conjunction with the &#8220;node&#8221; command within an iRule the F5 issues a RST back to both the client and server.<\/p>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Background\"><\/span><strong>Background<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Lets look at an example. First we`ll look at the configuration and then the resulting behaviour.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Configuration\"><\/span><strong>Configuration<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>You have the following configured,<\/p>\n<ul>\n<li>You have persistence configured on a virtual server via the use of a Universal Persistence profile. Within the Universal Persistence profile you have an iRule attached (fig. irule example 1) thats uses the &#8216;persist add uie&#8217; command.<\/li>\n<li>Assigned to the virtual server you have an irule that uses the &#8216;node&#8217; command (fig. irule example 2).<\/li>\n<\/ul>\n<pre class=\"prettyprint&quot;\">rule IRULE-COOKIEPERSIST {\r\n \u00a0\u00a0\u00a0 when HTTP_REQUEST {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if { [HTTP::cookie exists \"b1P\"] } {\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 persist uie [HTTP::cookie value \"b1P\"]\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 set cookie_check 0\u00a0\u00a0\u00a0 \r\n\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0 } else {\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 set cookie_check 1\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0\u00a0 when HTTP_RESPONSE { \u00a0\u00a0 \u00a0\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if { $cookie_check eq 1 } {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 set now [clock seconds]\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 set token \"[IP::server_addr][expr { int(1000000 * rand()) }]\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 binary scan [md5 $token] H* md5var junk\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 HTTP::cookie insert name \"b1P\" path \/ value $md5var\\_$now\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 persist add uie [HTTP::cookie \"b1P\"]\r\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0}\r\n\u00a0\u00a0\u00a0 }\r\n }<\/pre>\n<p style=\"text-align: center;\"><em>&lt;irule example 1&gt;<\/em><\/p>\n<pre class=\"prettyprint&quot;\">rule IRULE-URIFORWARD { \r\n \u00a0\u00a0\u00a0 when HTTP_REQUEST {\r\n\u00a0 \u00a0 \u00a0 \u00a0 if { [HTTP::uri] contains \"Secure\" } { \r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 node 192.168.1.31 80\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 } \r\n\u00a0\u00a0\u00a0 }\r\n }<\/pre>\n<p style=\"text-align: center;\"><em>\u00a0&lt;irule example 2&gt;<\/em><\/p>\n<h4><span class=\"ez-toc-section\" id=\"Behaviour\"><\/span><strong>Behaviour<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li>At the point you issue a HTTP GET Request a RST is sent back to both the client and the server.<\/li>\n<li>The following error can be observed within \/var\/log\/ltm &#8211; &#8216;&lt;HTTP_RESPONSE&gt; &#8211; Prerequisite operation not in progress (line 1)&#8217;<\/li>\n<li>If you issue a HTTP HEAD Request the headers are successfully received.<\/li>\n<li>If you create a pool with the nodes IP as a pool member the request is successfully received.<\/li>\n<\/ul>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Reason\"><\/span><strong>Reason<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The reason for this behaviour is because the &#8216;node&#8217; command does not trigger the LB_SELECTED event which is a prerequisite for &#8216;persist uie add&#8217;.<\/p>\n<p>Below shows each of the steps that occur prior to the RST`s being sent.<\/p>\n<ol>\n<li>The client sends a HTTP Request to the virtual server.<\/li>\n<li>The virtual server processes the request. This hits the iRule within the Universal Persistence profile first, then the iRule attached to the virtual server is processed.<\/li>\n<li>The request is then sent to the node via the &#8216;node&#8217; command (fig. irule example 1).<\/li>\n<li>The server sends the response.<\/li>\n<li>Again the virtual server processes the response and the HTTP_RESPONSE event is triggered due to no cookie being seen within the initial request.<\/li>\n<li>The F5 then tries to execute the command &#8220;persist uie add&#8221; but fails as the LB_SELECTED event was not triggered by the previous node command (which is a prerequisite for &#8216;persist add uie&#8217;).<\/li>\n<li>The F5 sends a RST back to the client and the server and logs the appropriate log message.<\/li>\n<\/ol>\n<p><em><strong>Note<\/strong> : Though it appears that a HTTP HEAD request works actually both HEAD and GET fail and result in a RST. What really happens is the first packet of the response is sent back to the client just a fraction before the reset. Because of this if the response is only 1 packet in length it appears (by the client) the request\/response is successful, even though the client receives both the response and RST.<\/em><\/p>\n<h2 class=\"h3\"><span class=\"ez-toc-section\" id=\"Solution\"><\/span><strong>Solution<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>There are 2 solutions. They are,<\/p>\n<ol>\n<li><strong>Pool command<\/strong> &#8211; by using the &#8216;pool&#8217; command instead of the &#8216;node&#8217; command the LB_SELECTED event is triggered and the &#8216;persist uie add&#8217; command is successfully executed.<\/li>\n<li><strong>Changing the Priority<\/strong> &#8211; by placing the command &#8220;<a href=\"https:\/\/devcentral.f5.com\/wiki\/iRules.priority.ashx\" class=\"broken_link\">priority<\/a> 1&#8243; at the top of the iRule (i.e before the first event) that contains the &#8216;node&#8217; command, you can ensure that the uie persistence iRule is not processed first. Then via the use of &#8220;<a href=\"https:\/\/devcentral.f5.com\/articles\/irules-disabling-event-processing\" class=\"broken_link\">event disable<\/a>&#8221; you can ensure &#8220;persist uie add&#8221; is not executed. Below shows an example (fig irule example 3)<\/li>\n<\/ol>\n<pre class=\"prettyprint&quot;\">priority 1\r\nrule IRULE-URIFORWARD { \r\n \u00a0\u00a0\u00a0 when HTTP_REQUEST {\r\n\u00a0 \u00a0 \u00a0 \u00a0 if { [HTTP::uri] contains \"Secure\" } { \r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 node 192.168.1.31 80\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 } \r\n\u00a0\u00a0\u00a0 }\r\n\u00a0\u00a0\u00a0 when HTTP_RESPONSE {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 event disable\r\n\u00a0\u00a0\u00a0 }\r\n}\r\n<\/pre>\n<p style=\"text-align: center;\"><em>\u00a0&lt;irule example 3&gt;<\/em><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Problem When using the command &#8220;persist uie add&#8221; in conjunction with the &#8220;node&#8221; command within an iRule the F5 issues a RST back to both the client and server. Background Lets look at an example. First we`ll look at the configuration and then the resulting behaviour. Configuration You have the following configured, You have persistence &#8230; <a title=\"F5 LTM (Deep Dive) &#8211; Using &#8216;persist uie add&#8217; with the &#8216;node&#8217; command in an iRule causes the F5 to send a RST\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Loadbalancers\/F5-BIG-IP\/f5-ltm-using-qpersist-uie-addq-with-the-node-command-in-an-irule-causes-rst.html\" aria-label=\"Read more about F5 LTM (Deep Dive) &#8211; Using &#8216;persist uie add&#8217; with the &#8216;node&#8217; command in an iRule causes the F5 to send a RST\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"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>F5 LTM (Deep Dive) - Using &#039;persist uie add&#039; with the &#039;node&#039; 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