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ChetanAr_315803's avatar
ChetanAr_315803
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Mar 28, 2019

Changing member priority in GTM using i-rule

Hi, We have a requirement of changing the pool member priority in GTM for global availability based on the status of pool member of another pool. How can we accomplish it? We can check the active_mem...
application delivery
BIG-IP DNS
big-ip gtm
Karim_Benyello1's avatar
Karim_Benyello1
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Hi

 

Could you please clarify what you want to achieve ? the pools you are talking about are wideip pool or regular ltm pool ? why do you want to change the priority since you'are using the Global availability lb method?

 

many thanks,

 

ChetanAr_315803's avatar
ChetanAr_315803
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Apr 01, 2019

We want to monitor public WAF of our AWS environment covering primarily two use cases: 1) To shift traffic on backup cname of WAF in case any bug hits set of primary ones (as they are running in sync, so entire set will be gone in case of bug) 2) To check traffic in staggered way (10, 20 and so on...)once patching is done in order to check if everything is fine with the new patch. To acheive it, we have added the cname as LTM pool member and mapped the same in GTM and applied the i-rule as below:

 

when DNS_REQUEST { if {[active_members <primary waf pool name>] >= 1}{ cname "<primary waf name>" } else { cname "<backup-waf name>" } }

 

It is helpful for 1 but we are still figuring out the way for 2. One option which we could think of is changing the ratio in 'Ratio' LB method through i-rule (Any idea if this is achiveable?) Priority one is not required anymore as 1 is achieved :-)