Good morning, I have an iRule that is designed to select a pool based on a string found in the uri and it doesn't seem to be working. I have a log that collects the uri for reference. The "test" rule I have in place that searches the uri and creates the "destination pool name" seems to be creating the pool name correctly, but when I put the "action" rule into place the http request hangs. Background and iRules are provided below. Background: -The VIP is listening on port 80 and has a default pool listening on 8981 -The web application being load balanced is Tibco ESB -There are 25 separate services that are supported by this application and all are listening on different ports -Individual pools are created with basic http monitor showing all pool members as "up" -Our pools have a naming convention that has a string before and after the service name. (i.e. esb__pool) -Use of "uri" and "test" rules yield the following log entries: Dec 1 08:37:28 tmm tmm[1097]: Rule esb_pool-uri-log : ====VIP uri request is /eProxy/service/CreditCardService?wsdl==== Dec 1 08:37:28 tmm tmm[1097]: Rule esb_pool-mgr_test : ==ESB Tibco: Requested pool name is esb_CreditCardService_pool== -Use of the "uri" and "action rules yield the following log entries: ec 1 08:43:36 tmm tmm[1097]: Rule esb_pool-uri-log : ====VIP uri request is /eProxy/service/CreditCardService?wsdl==== Dec 1 08:43:36 tmm tmm[1097]: Rule esb_pool-mgr_action : ==ESB Tibco: Requested pool name is esb_CreditCardService_pool== iRules: "uri logging rule" rule esb_pool-uri-log { when HTTP_REQUEST { set esb_uri [HTTP::uri] log local0. "====" log local0. "====VIP uri request is $esb_uri====" } } ++++++++++++++++++++++++++ "pool selection test rule" rule esb_pool-mgr_test { when HTTP_REQUEST { set front "esb_" set back "_pool" set svc_uri [getfield [HTTP::uri] ? 1] set svc_name [getfield $svc_uri "dir1/service/" 2] set pool_name [concat $front$svc_name$back] log local0. "==ESB Tibco: Requested pool name is $pool_name==" } } ++++++++++++++++++++++++++ "pool selection action rule" rule esb_pool-mgr_action { when HTTP_REQUEST { set front "esb_" set back "_pool" set svc_uri [getfield [HTTP::uri] ? 1] set svc_name [getfield $svc_uri "dir1/service/" 2] set pool_name [concat $front$svc_name$back] log local0. "==ESB Tibco: Requested pool name is $pool_name==" if { [catch { pool $pool_name } ] } { log local0. "====ERROR: Attempting to assign traffic to non-existant pool $pool_name====" log local0. "====Sending traffic to default esb pool====" pool esb_8981_pool } } } Is there something I am missing that is not sending the traffic to the correct pool? Thanks, Kevin

Kevin, The logs look correct, and the iRules don't have any obvious errors in them, either. Are you sure that the pools that the iRule is trying to send traffic to exists exactly as it's being called? Are there any other messages being logged to /var/log/ltm when you're trying to pass traffic via this iRule? Colin

Colin, thanks for the sanity check and reply. That being said,,, It seems that what the customer wants isn't exactly what was conveyed. Here is what I'm left with to do: 1. Create a pool for each of the service end points - Done 2. Create a health monitor for each of the service end point pools - In progress 3. Create a string class containing the service end point names (for matching to pools) and service end point pool port numbers - Done (string entries in class are ":" and svc_name equals service pool name as noted in item 1.) 4. Create an iRule that compares the health of the selected node in the default pool (request entry point) and the health of the service end point on the same selected node and process the request if both values are "true" or reselect if either is false. I have what I think is a completed iRule, but I'm getting an error that the command is out of context in regards to the bit below. "when LB_SELECTED { if { ([LB::status pool [LB::server pool] member [LB::server ip] [LB::server port]] eq "up") and ([LB::status pool $svc_pool member [LB::server ip] $svc_name-port] eq "up") }" ===iRule begin=== when HTTP_REQUEST { pool esb_8981_pool set sel_node [LB::server name] set front "esb_" set back "_pool" set svc_name [getfield $svc_uri "eProxy/service/" 2] set svc_pool [concat $front$svc_name$back] foreach line $::esb_svc_name-port_class { if {[string match [getfield $line ":" 1] $svc_name] } { set svc_name-port [getfield $line ":" 2]} } when LB_SELECTED { if { ([LB::status pool [LB::server pool] member [LB::server ip] [LB::server port]] eq "up") and ([LB::status pool $svc_pool member [LB::server ip] $svc_name-port] eq "up") } { eval $sel_node } else { LB::reselct } } } ===iRule end===== If someone could take a look at that iRule and tell me where my syntax is out of whack, I would surely appreciate it. Thanks, Kevin

Hi Kevin, Which LTM version are you running? Can you log the output of $svc_name-port and $sel_node before using them in the if statement in LB_SELECTED? Thanks, Aaron

Aaron, BigIP version information below: Kernel: Linux 2.4.21-9.3.0.178.0smp Package: BIG-IP Version 9.3.0 192.0 Hotfix HF2 Edition In going over the iRule and DevCentral documentation regarding HTTP_REQUEST and LB_SELECTED, I'm finding that "LB::status" is not an allowed command for either of those two events. If I am reading the documentation correctly, I can only get LB::status under the LB_FAILED event. Is there another event that happens BEFORE the request is processed where I can get LB::status of the LB::server? What I need to do before the request is processed is to determine if the status of the selected node is "up" for both health monitors. =========update========= I thought that I might try using using "active_members -list" but found that I'm a few versions behind on that one. Is there an alternative to "active_members -list" that would return the same information? Also, is LB::status slated to be a valid command for LB_SELECTED?

Hi Kevin, LB::status should actually work in HTTP_REQUEST and LB_SELECTED. There were a few typos in your rule. LB::reselect was missing an 'e'. And there was a missing closing curly brace in HTTP_REQUEST and an extra one in LB_SELECTED. Also, I think you'll run into problems using a variable name with a hyphen: % set test-var 10 10 % puts $test-var can't read "test": no such variable % puts ${test-var} 10 You could either reference the variable with curly braces or just change it to an underscore: when HTTP_REQUEST { pool $esb_8981_pool set sel_node [LB::server name] set front "esb_" set back "_pool" set svc_name [getfield $svc_uri "eProxy/service/" 2] set svc_pool [concat $front$svc_name$back] foreach line $::esb_svc_name_port_class { if {[string match [getfield $line ":" 1] $svc_name] } { set svc_name_port [getfield $line ":" 2] } } } when LB_SELECTED { if { ([LB::status pool [LB::server pool] member [LB::server addr] [LB::server port]] eq "up")\ and ([LB::status pool $svc_pool member [LB::server addr] $svc_name_port] eq "up") } { eval $sel_node } else { LB::reselect } } Aaron

"Select pool based on uri content" iRule doesn't seem to be working

Forum Discussion

Recent Discussions

VIPRION B2250 to VELOS CX410 and BIG-IPr10900 migration

Maintenance page / local website that includes subfolders

Single LTM with multiple GTM domains

irule execution error

Issue with TLS Version 1.1 Deprecated Protocol

Related Content

"Content Switching" to non-addressable virtual server

exclude HTTP::header value Content-Type] equals "text/xml; charset=utf-8" from SSL redirect

"Could not uncompress compressed request content" error

Error - POSTMAN REST Client - Google Chrome - "Found invalid content-type. The content-type must be application/json" - Header IS set

why client got "Please enable JavaScript to view the page content." page ?