1.问题情况

Master主节点在 使用 kubeadm init 成功进行初始化后，如下所示

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

You can now join any number of control-plane nodes by copying certificate authorities
and service account keys on each node and then running the following as root:

  kubeadm join cluster-endpoint:6443 --token k5fx27.0lio5aod7s8b03md \
    --discovery-token-ca-cert-hash sha256:44dbbd0bb7495be1eb25f78a21103e0b52857df4671bab577af0f5e11ba6f7f1 \
    --control-plane

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join cluster-endpoint:6443 --token k5fx27.0lio5aod7s8b03md \
    --discovery-token-ca-cert-hash sha256:44dbbd0bb7495be1eb25f78a21103e0b52857df4671bab577af0f5e11ba6f7f1

但是子节点在使用  join cluster-endpoint加入到集群时报错

2.解决方法

两台子节点在加入集群时出错，通过docker 的配置文件daemon.json 内容

将内容删除 修改至  只有 mirrors镜像配置   如上图所示   保存后重启docker

#在子节点运行
#重启docker
systemctl stop docker
systemctl daemon-reload
systemctl restart docker

#重置 子节点的集群加载配置
kubeadm reset

#重新加入主节点集群
kubectl join cluster-endpoint:8888 ................................