Pool redirection and healthcheck

If you use a two pool approach, you would probably want to also check if the second pool has active members before using it. And then you'd want to handle the case where both pools are down.

 

 

It might be easier to use a single pool for each app and add the second set of servers at a lower priority in the same pool. LTM would automatically use the second set of pool members if no higher priority member was available.

 

 

Either way, you could use switch to do this a bit more efficiently:

 

 

 
 when HTTP_REQUEST { 
  
     Check requested URI 
    switch [string tolower [HTTP::uri]] { 
       "/sitea" { 
          pool webpool-1 
       } 
       "/siteb" { 
          pool webpool-2 
       } 
       default { 
          pool webpool-2 
       } 
    } 
 }  
 

 

 

If you run into problems with this rule or your own version, try adding logging to each code section and check the /var/log/ltm output to see what portions of the rule are being hit.

 

 

Aaron