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YUL89YYZ_72915's avatar
YUL89YYZ_72915
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May 26, 2015
Solved

iRule to re-direct a persistent failed node to a "sorry" page

We have an application which is load balanced to one of two nodes using the HTTP cookie Insert persistence method when the customer logs on to the application (that is, all the traffic will then go t...
application delivery
cookie persistence
design
devops
iRules
LTM
Josiah_39459's avatar
Josiah_39459
Historic F5 Account

You shouldn't need an irule to do this. If they are persisting to a failed node this is because either there is no Monitor on the pool, or because of the Pool setting "Action On Service Down":

 

https://support.f5.com/kb/en-us/solutions/public/15000/000/sol15095.html

 

which from your description should be set to Reselect. Look in your Pool -> Advanced.

 

Also, of interest is the HTTP profile setting "Fallback Host", which allows you to redirect to an external page when the whole pool fails:

 

https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm-profiles-reference-11-6-0/2.html

 

YUL89YYZ_72915's avatar
YUL89YYZ_72915
Icon for Nimbostratus rankNimbostratus
May 26, 2015
Thanks for your answer. The only problem is that the two nodes do not share state so if the "BIG-IP system manages established client connections by moving them to an alternate pool member without a connection teardown or setup" than the user's state is lost. What I want is for the BIG-IP to re-direct the connection to a web page which explains what has happened. If the BIG-IP does this automatically the user will get a new login screen without understanding what went wrong. Is there a way to do this?