kubeadm join - Failed to request cluster info - getsockopt: no route to host

[DK]

Hi,

How can I debug what's going wrong with kubeadm join

kubeadm join --token zzzzzzzzzzzzzz 10.134.30.100:6443 --discovery-token-ca-cert-hash sha256:xxxxxxxx

[kubeadm] WARNING: kubeadm is in beta, please do not use it for production clusters.

[preflight] Running pre-flight checks

[discovery] Trying to connect to API Server "10.134.30.100:6443"

[discovery] Created cluster-info discovery client, requesting info from "https://10.134.30.100:6443"

[discovery] Failed to request cluster info, will try again: [Get https://10.134.30.100:6443/api/v1/namespaces/kube-public/configmaps/cluster-info: dial tcp 10.134.30.100:6443: getsockopt: no route to host]

I noticed kube-dns  was  Running but I guess after I tried join it went into CrashLoopBackOff

kubectl get pods --all-namespaces

NAMESPACE     NAME                             READY     STATUS             RESTARTS   AGE

kube-system   etcd-master                      1/1       Running            0          24m

kube-system   kube-apiserver-master            1/1       Running            0          24m

kube-system   kube-controller-manager-master   1/1       Running            0          24m

kube-system   kube-dns-545bc4bfd4-pfhxf        1/3       CrashLoopBackOff   15         25m

kube-system   kube-flannel-ds-b6smz            1/1       Running            0          24m

kube-system   kube-proxy-khmnj                 1/1       Running            0          25m

kube-system   kube-scheduler-master            1/1       Running            0          24m

[DK]

Disabling firewall on the master solved the issue

systemctl disable firewalld

systemctl stop firewalld