We have pre-set an environment variable PRIMARY_IP on all VMs which is the IP address that kube components should be using. PRIMARY_IP is defined as the IP address of the network interface on the node that is connected to the network having the default gateway, and is the interface that a node will use to talk to the other nodes. For those interested, this variable is assigned the result of the following command
ip route | grep default | awk '{ print $9 }'
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