how to make HAproxy itself reply to a health check from another load balancer?

[Florin Andrei]

Let's say HAproxy is used for a second layer of load balancers, with the 
first layer being AWS ELBs.


When you create an ELB, you can specify a health check. This should 
actually check the health of the HAproxy instances that the ELB is 
pointing at.


Is there a way to make HAproxy answer a health check from an ELB? This 
health check cannot be passed all the way to the backend web servers, 
because they all answer different URL prefixes.



--
Florin Andrei
http://florin.myip.org/

Re: how to make HAproxy itself reply to a health check from another load balancer?

[Pavlos Parissis]

On 07/04/2015 09:55 μμ, Florin Andrei wrote:
 Let's say HAproxy is used for a second layer of load balancers, with the
 first layer being AWS ELBs.
 
 When you create an ELB, you can specify a health check. This should
 actually check the health of the HAproxy instances that the ELB is
 pointing at.
 
 Is there a way to make HAproxy answer a health check from an ELB? This
 health check cannot be passed all the way to the backend web servers,
 because they all answer different URL prefixes.
 
 

You can use monitor-uri, here is an example

acl site_dead nbsrv(foo_backend) lt 2
monitor-uri   /site_alive
monitor fail  if site_dead

then point healthcheck from ELB to ip/site_alive

Cheers,
Pavlos






signature.asc
Description: OpenPGP digital signature