Layer 4 Load balancer in front of many apache frontends serving tomcat backends that can crash

Published: 8/11/2019
Layer 4 Load balancer in front of many apache frontends serving tomcat backends that can crash
Source: SERVERFAULT.COM

i have a setup with : HAProxy acting as a layer 4 LB (just forwarding requests, passthrough) to multiple Apache frontends. Each of these apache frontends is sending the traffic to a tomcat backend where an application is running. Now, if one of these tomcats/applications is crashed, the corresponding apache frontend reports an error 503 (which is normal), others are OK. problem is : as HAProxy is

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