root@k8s-master01:~# kubectl apply -f https://docs.projectcalico.org/v3.1/getting-started/kubernetes/installation/hosted/kubeadm/1.7/calico.yaml
configmap/calico-config created
daemonset.extensions/calico-etcd created
service/calico-etcd created
daemonset.extensions/calico-node created
deployment.extensions/calico-kube-controllers created
clusterrolebinding.rbac.authorization.k8s.io/calico-cni-plugin created
clusterrole.rbac.authorization.k8s.io/calico-cni-plugin created
serviceaccount/calico-cni-plugin created
clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrole.rbac.authorization.k8s.io/calico-kube-controllers created
serviceaccount/calico-kube-controllers created
再次查看Node状态：
root@k8s-master01:~# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master01 Ready master 39m v1.12.0
k8s-master02 Ready master 24m v1.12.0
k8s-master03 Ready master 15m v1.12.0
各master上所有组件已正常：
root@k8s-master01:~# kubectl get pod -n kube-system -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE
calico-etcd-dcbtp 1/1 Running 0 102s 10.3.1.25 k8s-master03 <none>
calico-etcd-hmd2h 1/1 Running 0 101s 10.3.1.20 k8s-master01 <none>
calico-etcd-pnksz 1/1 Running 0 99s 10.3.1.21 k8s-master02 <none>
calico-kube-controllers-75fb4f8996-dxvml 1/1 Running 0 117s 10.3.1.25 k8s-master03 <none>
calico-node-6kvg5 2/2 Running 1 117s 10.3.1.21 k8s-master02 <none>
calico-node-82wjt 2/2 Running 1 117s 10.3.1.25 k8s-master03 <none>
calico-node-zrtj4 2/2 Running 1 117s 10.3.1.20 k8s-master01 <none>
coredns-576cbf47c7-2dqsj 1/1 Running 0 38m 192.168.85.194 k8s-master02 <none>
coredns-576cbf47c7-7sqqz 1/1 Running 0 38m 192.168.85.193 k8s-master02 <none>
kube-apiserver-k8s-master01 1/1 Running 0 37m 10.3.1.20 k8s-master01 <none>
kube-apiserver-k8s-master02 1/1 Running 0 22m 10.3.1.21 k8s-master02 <none>
kube-apiserver-k8s-master03 1/1 Running 0 12m 10.3.1.25 k8s-master03 <none>
kube-controller-manager-k8s-master01 1/1 Running 0 37m 10.3.1.20 k8s-master01 <none>
kube-controller-manager-k8s-master02 1/1 Running 0 21m 10.3.1.21 k8s-master02 <none>
kube-controller-manager-k8s-master03 1/1 Running 0 12m 10.3.1.25 k8s-master03 <none>
kube-proxy-6tfdg 1/1 Running 0 23m 10.3.1.21 k8s-master02 <none>
kube-proxy-dpvkk 1/1 Running 0 38m 10.3.1.20 k8s-master01 <none>
kube-proxy-msqgn 1/1 Running 0 14m 10.3.1.25 k8s-master03 <none>
kube-scheduler-k8s-master01 1/1 Running 0 37m 10.3.1.20 k8s-master01 <none>
kube-scheduler-k8s-master02 1/1 Running 0 22m 10.3.1.21 k8s-master02 <none>
kube-scheduler-k8s-master03 1/1 Running 0 12m 10.3.1.25 k8s-master03 <none>
root@k8s-master01:~#
在所有worker节点上使用kubeadm join进行加入kubernetes集群操作，这里统一使用k8s-master01的apiserver地址来加入集群
在k8s-node01加入集群：
root@k8s-node01:~# kubeadm join 10.3.1.20:6443 --token w79yp6.erls1tlc4olfikli --discovery-token-ca-cert-hash sha256:7aac9eb45a5e7485af93030c3f413598d8053e1beb60fb3edf4b7e4fdb6a9db2
输出如下信息：