[kube-up][scale-out] at worker nodes, prometheus service not started due to "PROXY_RESERVED_IP: unbound variable" error

[h-w-chen]

What happened:
at worker nodes of scale-out cluster, prometheus service not started, and there is error message near the end of /var/log/master-init.log:

/home/kubernetes/bin/configure-helper-common.sh: line 1461: PROXY_RESERVED_IP: unbound variable

What you expected to happen:
no such error

How to reproduce it (as minimally and precisely as possible):
start kube-up cale-out 1 tp, 1 rp with 1 worker cluster, cat /etc/log/master-init.log

Anything else we need to know?:

1. clarify whether prometheus should be enabled in scale-out cluster;
2. if it should, what nodes should prometheus services are running;

Environment:

• Arktos version (use kubectl version):
• Cloud provider or hardware configuration:
• OS (e.g: cat /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools: kube-up scale-out, 1tp, 1 rp w/ 1 worker
• Network plugin and version (if this is a network-related bug):
• Others:

[yb01]

I would say disable prometheus on nodes.