We've setup Wordpress in the Google Cloud (Kubernetes in Google Container Engnine if that matters) and configured an HTTP Load Balancer. As a part of doing this we've setup a health check that is configured like this:
But the strange thing is that when I tail the logs of the Wordpress instance it looks like this:
10.244.1.1 - - [21/Jan/2016:08:52:28 +0000] "GET /?healthCheck=true HTTP/1.1" 200 36784 "-" "GoogleHC/1.0"
10.244.1.1 - - [21/Jan/2016:08:52:30 +0000] "GET /?healthCheck=true HTTP/1.1" 200 36784 "-" "GoogleHC/1.0"
10.240.0.3 - - [21/Jan/2016:08:52:32 +0000] "GET /?healthCheck=true HTTP/1.1" 200 36784 "-" "GoogleHC/1.0"
10.244.1.1 - - [21/Jan/2016:08:52:33 +0000] "GET /?healthCheck=true HTTP/1.1" 200 36784 "-" "GoogleHC/1.0"
10.240.0.2 - - [21/Jan/2016:08:52:35 +0000] "GET /?healthCheck=true HTTP/1.1" 200 36784 "-" "GoogleHC/1.0"
I.e. it looks like the health check is sent every other second (or even more?). Why could this be?