[root@k8s-master01 ~]# kubeadm init --config config.yaml

[init] Using Kubernetes version: v1.10.0
[init] Using Authorization modes: [Node RBAC]
[preflight] Running pre-flight checks.
[preflight] Some fatal errors occurred:
        [ERROR Port-6443]: Port 6443 is in use
        [ERROR Port-10250]: Port 10250 is in use
        [ERROR Port-10251]: Port 10251 is in use
        [ERROR Port-10252]: Port 10252 is in use
        [ERROR FileAvailable--etc-kubernetes-manifests-kube-apiserver.yaml]: /etc/kubernetes/manifests/kube-apiserver.yaml already exists
        [ERROR FileAvailable--etc-kubernetes-manifests-kube-controller-manager.yaml]: /etc/kubernetes/manifests/kube-controller-manager.yaml already exists
        [ERROR FileAvailable--etc-kubernetes-manifests-kube-scheduler.yaml]: /etc/kubernetes/manifests/kube-scheduler.yaml already exists
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`

解决方案：发现杀死进程都没有用，最终重启一下kubeadm就可以了，如下：

[root@k8s-master01 ~]# kubeadm reset

配置kubectl工具

需要这些配置命令的原因是:Kubernetes 集群默认需要加密方式访问。所以，这几条命令，就是 将刚刚部署生成的 Kubernetes 集群的安全配置文件，保存到当前用户的.kube 目录下，kubectl 默 认会使用这个目录下的授权信息访问 Kubernetes 集群。
如果不这么做的话，我们每次都需要通过 export KUBECONFIG 环境变量告诉 kubectl 这个安全配 置文件的位置。
[root@centos7vm ~]# mkdir -p $HOME/.kube
[root@centos7vm ~]# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@centos7vm ~]# chown $(id -u):$(id -g) $HOME/.kube/config

[root@centos7vm ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
centos7vm NotReady master 28m v1.14.1
如果没有执行上面的命令，在执行kubectl get nodes会报如下的错误
[root@centos7vm ~]# kubectl get nodes
The connection to the server localhost:8080 was refused - did you specify the right host or port?