curl -fsSL get.docker.com -o get-docker.sh
vi get-docker.sh
sh get-docker.sh --mirror Aliyun
systemctl daemon-reload
启动、重启 关闭
systemctl start docker
systemctl restart docker
systemctl stop docker
安装kubelet （步骤二）
设置配置文件 跟阿里镜像仓库
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
配置跟安装
setenforce 0
# 将 SELinux 设置为 permissive 模式（相当于将其禁用）
sudo setenforce 0
sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
sudo yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
设置开机自启动
sudo systemctl enable --now kubelet
systemctl restart kubelet
swapoff -a
设置主机名称
hostnamectl set-hostname master
hostname
准备步骤 修改master host信息 其他节点 不修改
vim /etc/hosts
192.168.0.138 master
192.168.0.142 node1
192.168.0.143 node2
重启服务器 使hosts生效
reboot now
sysctl --system 
yum install ntpdate -y
ntpdate time.windows.com
初始化master节点
kubeadm init \
--apiserver-advertise-address=192.168.0.142 \ # 本机ip 只需要修改这一个
--image-repository registry.aliyuncs.com/google_containers \
--pod-network-cidr=10.244.0.0/16
这可能会出现一个问题  Get http://localhost:10248/healthz: dial tcp 127.0.0.1:10248: connect: connection refused.

[root@k8s-node2 ~]# vim /etc/docker/daemon.json
"exec-opts": ["native.cgroupdriver=systemd"],
重启docker
[root@k8s-node2 ~]# systemctl restart docker
重置kubelet
[root@k8s-master ~]# kubeadm reset -f
设置后重新 初始化 完成
  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
 sudo chown $(id -u):$(id -g) $HOME/.kube/config
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
报错连接不上 修改hosts
vim /etc/hosts
199.232.68.133 raw.githubusercontent.com
mater操作完后，其他节点操作步骤一 步骤三 然后 复制 master 执行成功后的join

# master需要执行的
 mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config
# master执行结束
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/
Then you can join any number of worker nodes by running the following on each as root:
# 其他节点 执行以下语句
kubeadm join 192.168.0.138:6443 --token gsx0cs.zz0hi3m7dj4kl4rv \
	--discovery-token-ca-cert-hash sha256:5a0caffb4721abe446adebb9b62fd677c0a4923b4fee9fed39df4aacef1516ac 
kubectl apply -f filename
查看pod
kubectl get pod
查看pod详情
kubectl describe pod pod名称
查看缩略信息
kubectl get pod -o wide
列出文件名
kubectl exec  mynginx ls /
kubectl exec -it mynginx /bin/bash
kubectl cp /etc/localtime containerid:/etc/localtime
error: unable to recognize "mynginx-deployment.yml": no matches for kind "Deployment" in version "extensions/v1beta1"
修改apiVersion
kubectl edit deployment mynginx-deployment
修改问价 重新apply -f
重置kubeadm
# 重置kubeadm
kubeadm reset
 journalctl -fu kubelet
firewalld is active, please ensure ports [6443 10250] are open or your cluste r may not function correctly
firewall-cmd --zone=public --add-port=6443/tcp --permanent && firewall-cmd --zone=public --add-port=10250/tcp --permanent && firewall-cmd --reload
 running with swap on is not supported. Please disable swap
swapoff -a
编辑/etc/fstab文件，注释掉swap行
vim /etc/fstab 
The connection to the server 192.168.0.138:6443 was refused - did you specify the right host or port?