Forum Discussion

Uber_Nathan_202's avatar
Uber_Nathan_202
Icon for Nimbostratus rankNimbostratus
May 21, 2015
Solved

iApp variable scope

Hi all, I'm writing my first iApp to automate deployment of a few virtual servers, nodes, pools and iRule data-groups I have finished the presentation section and am now starting on the implement...
application delivery
design
devops
f5 iapps
iApps
LTM
TMSH
  • Fred_Slater_856's avatar
    Fred_Slater_856
    May 21, 2015

    Scope is not the problem. Tcl treats anything inside curly braces as verbatim. Enclosed strings in quotes and escape each curly brace with a backslash.

     

    tmsh_modify "ltm data-group internal /Common/snat-map records add { $::private__privateAddr { data $::public__publicAddr }}"

     

jojo83_271212's avatar
jojo83_271212
Icon for Nimbostratus rankNimbostratus

Hi Fred! I've a similar questions:

I'm modifying an iApp in order to create an irule to assign to the vs.

the assignment is here { [iapp_conf create ltm virtual ${app}_vs \ destination [iapp_destination $::pool__addr $::pool__port] \ mask $mask \ $vs_params \ ip-protocol tcp \ mirror $mirror_action \ profiles replace-all-with { $tcp_profiles http } \ rules { iwf_test_irulebal iwf_$irulelog }] }

the irule are very simple

the first irule is with no variables

tmsh::create ltm rule iwf_$irulelog { 

when HTTP_REQUEST { 
    log local0. "No variables" 
}
`


}

the second irule need to balance on the pool created with the iapp, so i need to write it with variable statement and not with string


`iapp_conf create ltm rule iwf_test_irulebal {

when HTTP_REQUEST { 

if { [HTTP::uri] starts_with "/portal${app}_pool" } {
    use pool ${app}_pool }
else {
    TCP::close
}
}
}

i've tried with \before the { but seems not works. also with ::global variable but not works.

In a classic BIG-IP environment without iapp the use of variable in irule works. how can i use the variable in an irule created with an iapp?

jojo83_271212's avatar
jojo83_271212
Icon for Nimbostratus rankNimbostratus
Nov 06, 2017

Hi Fred,

 

I tried your suggestion but I encountered some problem with the variable "Iwf_test_irulebal".

 

in the meantime I had solved this

 

set :: iapp_sn $ tmsh :: app_name set :: pool_irule $ {:: iapp_sn} _pool

 

set infile1 [open "/var/tmp/irule.tmp" "w" "0644"] puts $ infile1 "ltm rule /Common/$::iapp_sn.app/irule$::iapp_sn \ {" puts $ infile1 "app-service $ :: iapp_sn" puts $ infile1 "when HTTP_REQUEST \ {" puts $ infile1 "if \ {\ [HTTP :: uri ] starts_with \" / portal $ :: iapp_sn \ "} \ {" puts $ infile1 "use pool $ :: pool_irule }" puts $ infile1 "elseif \ {\ [HTTP :: uri ] starts_with \" / script $ :: iapp_sn \ "} \ {" puts $ infile1 "use pool $ :: pool_irule }" puts $ infile1 "else \ {" puts $ infile1 "TCP :: close" puts $ infile1 "}" puts $ infile1 "}" puts $ infile1 "}" close $ infile1

 

tmsh :: load sys config merge check file /var/tmp/irule.tmp

 

file delete "/var/tmp/irule.tmp"

 

set irulevs "/Common/$::iapp_sn.app/irule$::iapp_sn"

 

and it works.

 

but in the end I did as suggested by crodriguez.

 

https://devcentral.f5.com/s/feed/0D51T00006i7hIpSAI

 

thanks anyway Regards