Odtnhj

With reference to https://github.com/kubernetes/kubeadm/issues/1239. How do I configure and start the latest kubeadm successfully?

kubeadm_new.config is generated by config migration:
kubeadm config migrate --old-config kubeadm_default.config --new-config kubeadm_new.config. Content of kubeadm_new.config:

apiEndpoint:
 advertiseAddress: 1.2.3.4
 bindPort: 6443
apiVersion: kubeadm.k8s.io/v1alpha3
bootstrapTokens:
- groups:
 - system:bootstrappers:kubeadm:default-node-token
 token: abcdef.0123456789abcdef
 ttl: 24h0m0s
 usages:
 - signing
 - authentication
kind: InitConfiguration
nodeRegistration:
 criSocket: /var/run/dockershim.sock
 name: khteh-t580
 taints:
 - effect: NoSchedule
 key: node-role.kubernetes.io/master
---
apiVersion: kubeadm.k8s.io/v1alpha3
auditPolicy:
 logDir: /var/log/kubernetes/audit
 logMaxAge: 2
 path: ""
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controlPlaneEndpoint: ""
etcd:
 local:
 dataDir: /var/lib/etcd
 image: ""
imageRepository: k8s.gcr.io
kind: ClusterConfiguration
kubernetesVersion: v1.12.2
networking:
 dnsDomain: cluster.local
 podSubnet: ""
 serviceSubnet: 10.96.0.0/12
unifiedControlPlaneImage: ""

I changed "kubernetesVersion: v1.12.2" in kubeadm_new.config and it seems to progress further and now stuck at the following error:

failed to run Kubelet: Running with swap on is not supported, please disable swap! or set --fail-swap-on flag to false.

How do I set fail-swap-on to FALSE to get it going?

Kubeadm comes with a command which prints default configuration, so you can check each of the assigned default values with:
kubeadm config print-default

In your case, if you want to disable swap check in the kubelet, you have to add the following lines to your current kubeadm config:

---
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
failSwapOn: false