kubeadm_config.yaml

apiVersion: kubeadm.k8s.io/v1alpha1
kind: MasterConfiguration
api:
  advertiseAddress: {{ ansible_default_ipv4.address }}
networking:
  serviceSubnet: 10.40.41.0/16
  podSubnet: 10.41.42.0/16
kubernetesVersion: 1.9.3
nodeName: {{ ansible_hostname }}
etcd:
  endpoints:
  - https://{{ hostvars[groups['k8s-masters'][0]].ansible_default_ipv4.address }}:2379
  - https://{{ hostvars[groups['k8s-masters'][1]].ansible_default_ipv4.address }}:2379
  - https://{{ hostvars[groups['k8s-masters'][2]].ansible_default_ipv4.address }}:2379
  caFile: /etc/kubernetes/pki/etcd/ca.pem
  certFile: /etc/kubernetes/pki/etcd/client.pem
  keyFile: /etc/kubernetes/pki/etcd/client-key.pem
kubeProxy:
  config:
    mode: iptables
    clientConnection.kubeconfig: /etc/kubernetes/admin.conf
    clusterCIDR: 10.40.41.0/16
apiServerCertSANs:
- "{{ hostvars[groups['k8s-masters'][0]].ansible_default_ipv4.address }}"
- "{{ hostvars[groups['k8s-masters'][1]].ansible_default_ipv4.address }}"
- "{{ hostvars[groups['k8s-masters'][2]].ansible_default_ipv4.address }}"
- "127.0.0.1"
apiServerExtraArgs:
  apiserver-count: "3"