For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

ikkut23's avatar
ikkut23
Icon for Altostratus rankAltostratus
Oct 04, 2022

iCall script not working

Hi guys ,

 

 i have a scenario with a pool with two members ,Server A and Server B with priority group activated .

Server A - 192.168.16.80 pga 15

Server B 192.168.18.211 pga 10

i created an iCall script and what  i`m trying to accomplish is that when Server A will be down i want Server B to have a higher priority group so when Server A is back online it will be join pool as standby.

 

1) i created an alert /user_alert.conf

 

alert server1-down "Pool /Common/TeststanbyNode /Common/192.168.16.80:80 monitor status down." {
exec command="tmsh generate sys icall event change_pga context { { name ip value 192.168.16.80 } {name port value 80} }" }

 

2)created script 

 

sys icall script /Common/pool_member1_down {
app-service none
definition {
exec modify ltm pool TeststanbyNode members modify { 192.168.18.211:80 {priority-group 20}}
}
description none
events none
}

3)Handler

create sys icall handler triggered pool_member_down script pool_member1_down subscriptions add { change_pga {event-name change_priority} }
 
 
any idea what is wrong with my script 
 
 
Thank you in advance
Regards
 
application delivery
devops
event

6 Replies

  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Oct 04, 2022

    you're calling event change_pga from alertd but then icall script is expecting change-priority. Align those and you should be good to go.

  • ikkut23's avatar
    ikkut23
    Icon for Altostratus rankAltostratus
    Oct 05, 2022

    Hi Jason thnx a lot , now i`m getting this error on /var/ltm logs  when i execute :

    generate sys icall event change_priority

    tmsh[19010]: 01420006:3: members: required brace is missing "{"
    err scriptd[3868]: 014f0013:3: Script (/Common/pool_member1_down) generated this Tcl error: (script did not successfully complete: (Syntax Error: members: required brace is missing "{"

    and when i manually put node down no errors on /var/ltm logs except that pool member monitor is down but no change on priority.

     

    Thnx 

    • JRahm's avatar
      JRahm
      Icon for Admin rankAdmin
      Oct 05, 2022

      ah..two things. 

      1. Use tmsh::modify instead of exec, no need to leave the script to modify objects (this is an optimization, not a fix)
      2. Escape your braces:
      tmsh::modify ltm pool TeststanbyNode members modify \{ 192.168.18.211:80 \{priority-group 20\}\}
      • ikkut23's avatar
        ikkut23
        Icon for Altostratus rankAltostratus
        Oct 06, 2022

        yeapp that did work , 

        but still cant figure out with smth with alertd,when i mark the node down manually i can see on ltm log that 

        Pool /Common/TeststanbyNode member /Common/192.168.16.80:80 monitor status node down.

        but lets say its not triggering the event

        alert server1-down "Pool /Common/TeststanbyNode /Common/192.168.16.80:80 monitor status node down." {
        exec command="tmsh generate sys icall event change_pga context { { name ip value 192.168.16.80 } {name port value 80} }" }

         

        can you double check ,and also idk if its worth mentioning but Big-IP version is 14.1.2.3.

         

        ah also if i try and run "generate sys icall event .. " it works and script changes the pga.

         

        Thnx