I am able to run kubernetes (via kubeadm) on a private cluster/cloud without issue only when the nodes in the cluster have access to the internet (all node are connected to a dumb switch, which then has a network cable out to a gateway).
If I remove the network cable that gives nodes access to the internet and then try to setup my cluster and containers again. I get the following error on flannel:
I0720 21:55:48.351628 1 main.go:459] Using interface with name eth2 and address 192.168.10.1 I0720 21:55:48.351782 1 main.go:476] Defaulting external address to interface address (192.168.10.1) E0720 21:55:48.358553 1 main.go:223] Failed to create SubnetManager: error retrieving pod spec for 'kube-system/kube-flannel-ds-zr17s': Get https://10.96.0.1:443/api/v1/namespaces/kube-system/pods/kube-flannel-ds-zr17s: dial tcp 10.96.0.1:443: connect: network is unreachable
I'm having a hard time understand why would flannel need accesses to the internet? FYI, when connect via switch, I am able to communicate between nodes without issue using static IPs