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Forum Discussion

Manikanta's avatar
Manikanta
Icon for Nimbostratus rankNimbostratus
Jun 19, 2019

VIP monitoring multiple Pools

Our application is having a specific requirement where based on the URI we route the request between multiple Pools using an irule.   The problem we are having is on health check part, where cur...
application delivery
BIG-IP DNS
iRules
LTM
Manikanta's avatar
Manikanta
Icon for Nimbostratus rankNimbostratus
Jun 20, 2019

Thanks Dario and JG.

 

In my use case, I don't want to respond to client. we have backup. I just want to mark VIP down if any of the Pools are down, so the our BIG IP- DNS will not provide that IP to the client.

 

Basically our setup looks like below,

VIP

Default Pool : A

Other pools: B,C,D

Traffic between Pools being handled by an Irule with URI mapping.

 

We would like to see if there is any way where active_members of Pool A or B or C or D < 1 then Mark the VIP down/Red or Tell Big-Ip DNS that I am down.

 

Can we do that?

 

  • Dario_Garrido's avatar
    Dario_Garrido
    Icon for Noctilucent rankNoctilucent
    Jun 20, 2019

    Are you running an old release?

    This is not a normal behavior now.

    My config...

    ltm virtual VS-TEST_2000 {
    destination 10.130.40.150:sieve-filter
    ip-protocol tcp
    mask 255.255.255.255
    profiles {
        http { }
        tcp { }
    }
    rules {
        RULE_MarkDown
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    translate-address enabled
    translate-port enabled
    vs-index 18
}

    I'm forcing pool state down using UDP monitor.

    ltm pool P-ABC_80 {
    members {
        N-WEB1_10.1.1.1:http {
            address 10.1.1.1
            session monitor-enabled
            state down
        }
    }
    monitor udp 
}
ltm pool P-DEF_80 {
    members {
        N-WEB2_10.1.1.2:http {
            address 10.1.1.2
            session monitor-enabled
            state down
        }
    }
    monitor udp 
}

    iRule

    when HTTP_REQUEST {
	set uri [HTTP::uri]
	if { $uri starts_with "bla" } {
		pool /Common/P-ABC_80
	}
	elseif { $uri starts_with "ble" } {
		pool /Common/P-DEF_80
	}
	else {
		drop
	}
}

    KR,

    Dario.