My stick session

Question

Hi&nbsp;The system has multiple tomcat stype containers, they provide a JSESSIONID and we append a node id to the end so we have a JSESSION id that looks like&nbsp;JSESSIONID=83987345.nodeX  where X could 1 2 3 4 5 &nbsp;on my nginx setup i had&nbsp;&nbsp;server app1.env:XXXX slow_start=0s weight=1 max_fails=0 fail_timeout=10 route=node1;&nbsp;server app2.env:XXX slow_start=0s weight=1 max_fails=0 fail_timeout=10 route=node2;&nbsp;&nbsp;&nbsp;# Session Persistence based on JSESSION ID, if necessary&nbsp;&nbsp;sticky route $route_cookie;&nbsp;&nbsp;# jboss mapping for nodesmap $cookie_jsessionid $route_cookie {&nbsp;&nbsp;~.+\.(?P&lt;route&gt;\w+)$ $route;}&nbsp;&nbsp;I want to do this in F5 i presume with F5.&nbsp;But ... the persistence model in F5 break my nginx setup.&nbsp;so &nbsp;client A -&gt; connect talks to node1JSESSIONID 123456789.node1&nbsp;node1 diesclient A -&gt; get rerouted to node2JSESSIONID  123456789.node1... JSESSIONID 987654321.node1&nbsp;note 100% sure if the jsessionid changes or not. but i'm 100% sure that the nodeX stays the same&nbsp;&nbsp;until node1 comes back client gets routed to node2&nbsp;once node1 comes back the client is routed back to node1&nbsp;I presume irule.&nbsp;but how do I say go to pool member if its up otherwise go to pool (use the balancing method)&nbsp;&nbsp;&nbsp;&nbsp;

xuwen · Answer

pool_node1   member 10.1.1.10:80 monitor tcppool_node2 member 20.1.1.20:80 monitor tcppool_default member 10.1.1.10:80 20.1.1.20:80 monitor tcp&nbsp;iRuels code:&nbsp;when RULE_INIT {&nbsp;&nbsp;array set static::pool_array {&nbsp;&nbsp;&nbsp;&nbsp;1 pool_node1&nbsp;&nbsp;&nbsp;&nbsp;2 pool_node2&nbsp;&nbsp;}}when HTTP_REQUEST {&nbsp;&nbsp;if { [HTTP::cookie exists "JSESSIONID"] } {&nbsp;&nbsp;&nbsp;&nbsp;set node_x [findstr [HTTP::cookie "JSESSIONID"] "node" 4 1]&nbsp;&nbsp;&nbsp;&nbsp;log local0. "node_x is $node_x"&nbsp;&nbsp;&nbsp;&nbsp;if { [active_members [lindex [array get static::pool_array $node_x] 1]] == 0 } {&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pool pool_default&nbsp;&nbsp;&nbsp;&nbsp;} else {&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pool [lindex [array get static::pool_array $node_x] 1]&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;&nbsp;} else {&nbsp;&nbsp;&nbsp;&nbsp;pool pool_default&nbsp;&nbsp;}}

dario_garrido · Answer

Hello Alex.&nbsp;You could configure an iRule that routes traffic base on the "nodeX" value of the JSESSIONID cookie, checking first if this specific member is UP using "active_members" command.https://clouddocs.f5.com/api/irules/active_members.html&nbsp;Config details.Create an iRulecreate a generic pool with all memberscreate specific pools with only one member (let say, node1, node2, ...)&nbsp;iRules steps:Get the "nodeX" value.if "[active_members pool_nodeX] == 0" use generic poolif "[active_members pool_nodeX] &gt; 0" use specific pool (pool_nodeX)&nbsp;Hope this helps you.&nbsp;Regards,Dario.

alexs_yb · Answer

thanks i will check that out

alexs_yb · Answer

Think I like this.  but modifiedI will create singleton pools for each member and 1 pool with all members.then if I have no  JSESSIONID or no NODEthen go to the generic poolother wise test to see if pool with 1 node corresponding to the NODE1 is availableif yes then send it if no then send to generic pool&nbsp;&nbsp;

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