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tm500_165564's avatar
tm500_165564
Icon for Nimbostratus rankNimbostratus
Jun 05, 2015

Help with URI string-based session persistence

Hi all Warning: Newer to F5 but really enjoying the experience so far. Trying to get my hands dirty with iRules. I've been doing a lot of research on the forums and I haven't come across the "gol...
application delivery
devops
iRules
LTM
  • nitass's avatar
    nitass
    Jun 11, 2015

    If this happens the LB just sends the request to the same node that the TCP session is tied to - but the iRule still logs as seeing the new strID value. I was confused and expected this to create a new persistence record and load balance the request, but something tells me I would need more logic in my iRule to detach the connection and re-load balance it with a new persistence record.

     

    you can use oneconnect profile. it will do that for you.

     

nitass's avatar
nitass
Icon for Employee rankEmployee
Jun 06, 2015

i might be lost but can't we just use persist command?

e.g.

 

 configuration

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:80
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 20
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm pool foo
ltm pool foo {
    load-balancing-mode least-connections-member
    members {
        200.200.200.101:80 {
            address 200.200.200.101
        }
        200.200.200.111:80 {
            address 200.200.200.111
        }
    }
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm rule qux
ltm rule qux {
    when HTTP_REQUEST {
  set uri [HTTP::uri]
  set key [URI::query $uri strID]
  if { $key ne "" } {
    persist uie $key
  }
}
when HTTP_RESPONSE {
  log local0. "URI: $uri key: $key server: [IP::server_addr]:[TCP::server_port]"
}
}

 /var/log/ltm

[root@ve11a:Active:In Sync] config  tail -f /var/log/ltm
Jun  6 11:28:19 ve11a info tmm[30284]: Rule /Common/qux : URI: /some_uri?strID=Asb22332&TimeLimit=180&User=Joe&request=submit key: Asb22332 server: 200.200.200.101:80
Jun  6 11:28:20 ve11a info tmm1[30284]: Rule /Common/qux : URI: /some_uri?strID=Asb22332&TimeLimit=180&User=Joe&request=submit key: Asb22332 server: 200.200.200.101:80
Jun  6 11:28:20 ve11a info tmm[30284]: Rule /Common/qux : URI: /some_uri?strID=Asb22332&TimeLimit=180&User=Joe&request=submit key: Asb22332 server: 200.200.200.101:80

Jun  6 11:28:26 ve11a info tmm1[30284]: Rule /Common/qux : URI: /some_uri?strID=Asb12345&TimeLimit=180&User=Joe&request=submit key: Asb12345 server: 200.200.200.111:80
Jun  6 11:28:26 ve11a info tmm[30284]: Rule /Common/qux : URI: /some_uri?strID=Asb12345&TimeLimit=180&User=Joe&request=submit key: Asb12345 server: 200.200.200.111:80
Jun  6 11:28:27 ve11a info tmm1[30284]: Rule /Common/qux : URI: /some_uri?strID=Asb12345&TimeLimit=180&User=Joe&request=submit key: Asb12345 server: 200.200.200.111:80

Jun  6 11:28:33 ve11a info tmm[30284]: Rule /Common/qux : URI: / key:  server: 200.200.200.101:80
Jun  6 11:28:34 ve11a info tmm1[30284]: Rule /Common/qux : URI: / key:  server: 200.200.200.101:80
Jun  6 11:28:34 ve11a info tmm[30284]: Rule /Common/qux : URI: / key:  server: 200.200.200.111:80
Jun  6 11:28:39 ve11a info tmm1[30284]: Rule /Common/qux : URI: / key:  server: 200.200.200.111:80

Jun  6 11:28:47 ve11a info tmm[30284]: Rule /Common/qux : URI: /some_uri?strID=Asb22332&TimeLimit=180&User=Joe&request=submit key: Asb22332 server: 200.200.200.101:80
Jun  6 11:28:49 ve11a info tmm1[30284]: Rule /Common/qux : URI: /some_uri?strID=Asb22332&TimeLimit=180&User=Joe&request=submit key: Asb22332 server: 200.200.200.101:80
Jun  6 11:28:50 ve11a info tmm[30284]: Rule /Common/qux : URI: /some_uri?strID=Asb22332&TimeLimit=180&User=Joe&request=submit key: Asb22332 server: 200.200.200.101:80

Jun  6 11:28:56 ve11a info tmm1[30284]: Rule /Common/qux : URI: /some_uri?strID=Asb12345&TimeLimit=180&User=Joe&request=submit key: Asb12345 server: 200.200.200.111:80
Jun  6 11:28:57 ve11a info tmm[30284]: Rule /Common/qux : URI: /some_uri?strID=Asb12345&TimeLimit=180&User=Joe&request=submit key: Asb12345 server: 200.200.200.111:80
Jun  6 11:28:57 ve11a info tmm1[30284]: Rule /Common/qux : URI: /some_uri?strID=Asb12345&TimeLimit=180&User=Joe&request=submit key: Asb12345 server: 200.200.200.111:80