Failover Virtual server Configuration

ar.65535

Can you please let me know if A10 allows to configuration failover VIP?
For Example:
If i have a Virtual server ABC with backends X1/X2/X3, when all of them goes down, the traffic should be forwarded to a failover site where a different virtual server XYZ. That means XYZ should be configured as a failover virtual server to ABC.

Thanks,
Abhi

aaydnal

Hi Abhi,

Assuming that the back-end servers X1/X2/X3 are added under a service group.
Using aFlex we can check for the active members of the service group and redirect to backup vip if all the servers are Down.

Following is the aFlex:

aflex create redirect_if_down
when HTTP_REQUEST {
    if { [active_members example_service_group] < 1 } {
        HTTP::redirect "http://backup.example.com"
    }
}
.

and then bind the aFlex to the vip as shown below:
slb virtual-server abc 10.10.10.1
port 80 http
service-group example_service_group
aflex redirect_if_down

Hope this helps.

Avinash A.
A10 Professional Services Engineer

ar.65535

Hello Avinash,

Thank you for the reply, Can you please let me know if this can be done for udp ports?
Both the vip's in question are udp-514.

Thanks,
Abhi

ar.65535

Also, please provide me with the sample script to redirect udp traffic.

aaydnal

Redirect will not hold if it is a udp port.
In that case i suggest may be add a back-up service-group/server instead of a back-up vip.

aFlex:

aflex create back_up_service-group
when CLIENT_ACCEPTED {
    if { [active_members example_service_group] < 1 } {
        pool "back_up_service-group"
		# node "server-ip"
    }
}
.

slb virtual-server abc 10.10.10.1
port 514 udp
service-group example_service_group
aflex back_up_service-group

Let me know if this works. If you need more information , please open a A10 TAC case.
https://www.a10networks.com/support

Regards,
Avinash A.

ar.65535

Thank You Avinash!