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Forum Discussion

andrew_witherid's avatar
andrew_witherid
Icon for Nimbostratus rankNimbostratus
Apr 19, 2017

Applying a health monitor with DNS returned IP address

HI all,   i am looking to monitor a Destination selection based upon a DNS lookup, our current setup takes a HTTP request, extracts the Destination URL and preforms a DNS lookup, once the IP is r...
application delivery
iRules
LTM
Stanislas_Piro2's avatar
Stanislas_Piro2
Icon for Cumulonimbus rankCumulonimbus
Apr 19, 2017

Hi,

Even if I gave you a solution, I think it is obviously not the best practice. create a pool with pool member is as easy as create a DNS record.

The best solution is still to create pools with same name as host :

tmsh create ltm pool www.company.com monitor tcp members add { www.company.com:443 { fqdn { name www.company.com autopopulate enabled } } }

then, use the following irule:

when HTTP_REQUEST {
    if {[HTTP::uri] starts_with http} { HTTP::uri [findstr [HTTP::uri] [HTTP::host] [string length [HTTP::host]]} 
    if {[catch {pool [getfield [HTTP::host] ":" 1]}]} {
        HTTP::redirect "https://www.company.com/" 
    }
}