NimbostratusCan we assign two pools to single VIP.
I have one production pool and second as backup pool. When my production pool is down i need the backup pool to be UP. How can i gain this requirement.
Please suggest.
Atul Tilekar atultilekar@gmail.com
EmployeeYou'd generally use an iRule here. For example:
when CLIENT_ACCEPTED {
set default_pool [LB::server pool]
}
when HTTP_REQUEST {
if { [active_members $default_pool] < 1 } {
pool backup_pool
} else {
pool $default_pool
}
}
That's a great point, Farshadd. And indeed both options are viable. The iRule presents a logical approach to load balancing based on the availability of specific pools, while priority group activation puts all of the servers in the same pool and assigns a higher priority to some. In this case, the lower priority servers are only used if the higher priority servers are unavailable.
NimbostratusI think you should always use the provided configurations when possible. Unless there is some additional logic or functionality, I would use Priority Group Activation here. iRules add additional complexity, reduce efficiency, and in my experience, the folks supporting the applications and/or devices struggle more with iRules. Less iRules = less late night calls with questions from the NOC when something goes wrong.