一、Kubernetes中删除节点

#获取节点
kubectl get nodes

#驱逐节点
kubectl drain <node name> 

#删除节点之前撤销驱逐操作
kubectl drain <node name>
kubectl uncordon <node name>

#删除节点
 kubectl  delete nodes <node name>

二、Kubernetes加入master节点

#删除etcd脏数据
docker exec -it $(docker ps -f name=etcd_etcd -q) etcdctl --endpoints 127.0.0.1:2379 --cacert /etc/kubernetes/pki/etcd/ca.crt --cert /etc/kubernetes/pki/etcd/server.crt --key /etc/kubernetes/pki/etcd/server.key member list

docker exec -it $(docker ps -f name=etcd_etcd -q) etcdctl --endpoints 127.0.0.1:2379 --cacert /etc/kubernetes/pki/etcd/ca.crt --cert /etc/kubernetes/pki/etcd/server.crt --key /etc/kubernetes/pki/etcd/server.key member remove ab499d90fe199d50

#获取证书
kubeadm init phase upload-certs --upload-certs

#获取命令
kubeadm token create --print-join-command

#master执行命令
kubeadm join 192.168.3.30:6443 \
        --token s59meo.mr6r7ya0xddlqyxx  \
        --discovery-token-ca-cert-hash sha256:9e0449ef88621fc99cd38ef123367151fde69509eb2b1d3fb9a67d6a3ba1a052 \
        --control-plane --certificate-key bae9402785a4752746942245487a85c5a2ca2e1c03e4e68c059bb2a610844fcb --v=5

# 开始使用集群，您需要以常规用户身份运行以下命令
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

# 加入.bashrc，方便以后连接服务器自动执行
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >>/root/.bashrc

三、查看pod日志

kubectl logs coredns-6d8c4cb4d-kbksm -n kube-system
kubectl describe pod coredns-6d8c4cb4d-kbksm -n kube-system