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Neonsun_116864's avatar
Neonsun_116864
Icon for Nimbostratus rankNimbostratus
Nov 20, 2017

HTTP health check flapping - potential offenders?

We are seeing random pool members drop out due to TCP errors on an HTTP health check (basic GET against a static HTML page) for a specific pool. Seems to be load related but we're not exactly sure wh...
application delivery
custom http monitor
LTM
tcp
Andy_McGrath's avatar
Andy_McGrath
Icon for Cumulonimbus rankCumulonimbus
Nov 20, 2017

First increase your monitor timings, from Interval 5 secs to 10 secs, timeout 16 secs to 31 secs see if that helps.

 

Second get a tcpdump if you can see what is happening to the connection. It is possible the connection is not being closed correctly so web server (or something on the network) stops allowing any more active connections. Have seen this on older Linux Redhat servers that just run out of available TCP ports from the F5's Self IPs.