通过使用kind（Kubernetes in Docker），我们可以搭建Kubernetes集群
kind是什么意思
使用Kubernetes在Docker中的简称，通过启动多个Docker容器并将这些容器用作Kubernetes节点，可以构建一个多节点的Kubernetes集群。
创建环境
环境版本的总结
[root@xxxxxxxx ~]# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (Core)
[root@xxxxxxxx ~]# docker version
Client: Docker Engine - Community
Version: 20.10.1
API version: 1.41
Go version: go1.13.15
Git commit: 831ebea
Built: Tue Dec 15 04:37:17 2020
OS/Arch: linux/amd64
Context: default
Experimental: true
Server: Docker Engine - Community
Engine:
Version: 20.10.1
API version: 1.41 (minimum version 1.12)
Go version: go1.13.15
Git commit: f001486
Built: Tue Dec 15 04:35:42 2020
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.4.3
GitCommit: 269548fa27e0089a8b8278fc4fc781d7f65a939b
runc:
Version: 1.0.0-rc92
GitCommit: ff819c7e9184c13b7c2607fe6c30ae19403a7aff
docker-init:
Version: 0.19.0
GitCommit: de40ad0
[root@xxxxxxxx ~]# kubectl version
Client Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.0", GitCommit:"70132b0f130acc0bed193d9ba59dd186f0e634cf", GitTreeState:"clean", BuildDate:"2019-12-07T21:20:10Z", GoVersion:"go1.13.4", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.2", GitCommit:"52c56ce7a8272c798dbc29846288d7cd9fbae032", GitTreeState:"clean", BuildDate:"2020-06-03T04:00:21Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}
[root@xxxxxxxx ~]# kind version
kind v0.7.0 go1.13.6 linux/amd64
1. 初始設定、安裝
1-1. VPS初始设定（如有必要基于安全等理由）
・创建用户
・配置sshd相关设置（禁止root登录等）
・配置证书
等等…
1-2. 安装Docker
请根据以下参考链接，用中文进行重新表述（仅提供一种选择）：https://qiita.com/ymasaoka/items/b6c3ffea060bcd237478
1-3. 安装kubectl [参考URL]（https://tech-lab.sios.jp/archives/19226）
chmod +x ./kubectl
将./kubectl移动到/usr/local/bin/目录下
列出/usr/local/bin/目录下kubectl的详细信息
查看kubectl的版本
※忽略以下错误
连接到服务器localhost:8080被拒绝 – 是否指定了正确的主机或端口？
1-4. 安裝Kind [※參考網址]（https://tech-lab.sios.jp/archives/19226)
使用curl命令从以下网址下载kind二进制文件：https://github.com/kubernetes-sigs/kind/releases/download/v0.7.0/kind-$(uname)-amd64。
将下载的kind文件赋予执行权限，命令为chmod +x ./kind。
将kind文件移动到/usr/local/bin/目录下，命令为mv ./kind /usr/local/bin/。
运行ls -l /usr/local/bin/kind来检查kind版本。
1. 创建一个只含有一个节点（主节点）的Kubernetes集群。
执行kubernetes集群创建命令。
[root@xxxxxxxx ~]# kind create cluster
Creating cluster "kind" ...
✓ Ensuring node image (kindest/node:v1.17.0) ?
✓ Preparing nodes ?
✓ Writing configuration ?
✓ Starting control-plane ?️
✓ Installing CNI ?
✓ Installing StorageClass ?
Set kubectl context to "kind-kind"
You can now use your cluster with:
kubectl cluster-info --context kind-kind
Thanks for using kind! ?
确认
[root@xxxxxxxx ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
9cc673f1e968 kindest/node:v1.17.0 "/usr/local/bin/entr…" 2 minutes ago Up 2 minutes 127.0.0.1:49157->6443/tcp kind-control-plane
2-3. 上下文设置
Note: This translation may vary depending on the specific context or meaning in the original text.
通过设置和指定上下文，可以指定kubectl命令的目标Kubernetes集群。
[root@xxxxxxxx ~]# kubectl cluster-info --context kind-kind
Kubernetes master is running at https://127.0.0.1:49157
KubeDNS is running at https://127.0.0.1:49157/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
2-4. 确认Kubernetes集群的启动
[root@xxxxxxxx ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
kind-control-plane Ready master 5m58s v1.17.0
删除 Kubernetes 集群。
[root@xxxxxxxx ~]# kind delete cluster
Deleting cluster "kind" ...
[root@xxxxxxxx ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[root@xxxxxxxx ~]# kubectl get node
The connection to the server localhost:8080 was refused - did you specify the right host or port?
创建一个拥有多个节点（1个主节点，1个工作节点）的Kubernetes集群。
创建一个名为”yaml”的文件。
如果api版本和图像版本不匹配，将会失败。
apiVersion: kind.x-k8s.io/v1alpha4
kind: Cluster
nodes:
- role: control-plane
image: kindest/node:v1.18.2
- role: worker
image: kindest/node:v1.18.2
执行 kubernetes 集群创建命令时，3 减去 2。
[root@xxxxxxxx ~]# kind create cluster --config kind.yaml --name kindclluster
Creating cluster "kindclluster" ...
✓ Ensuring node image (kindest/node:v1.18.2) ?
✓ Preparing nodes ? ?
✓ Writing configuration ?
✓ Starting control-plane ?️
✓ Installing CNI ?
✓ Installing StorageClass ?
✓ Joining worker nodes ?
Set kubectl context to "kind-kindclluster"
You can now use your cluster with:
kubectl cluster-info --context kind-kindclluster
Have a nice day! ?
确认
[root@xxxxxxxx ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
bc55874ac1ff kindest/node:v1.18.2 "/usr/local/bin/entr…" About a minute ago Up About a minute kindclluster-worker
57fd25bbbeba kindest/node:v1.18.2 "/usr/local/bin/entr…" About a minute ago Up About a minute 127.0.0.1:49158->6443/tcp kindclluster-control-plane
[root@xxxxxxxx ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
kindclluster-control-plane Ready master 72s v1.18.2
kindclluster-worker Ready <none> 37s v1.18.2
3-4. 删除kubernetes集群
[root@xxxxxxxx ~]# kind delete cluster
Deleting cluster "kind" ...
[root@xxxxxxxx ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[root@xxxxxxxx ~]# kubectl get node
The connection to the server localhost:8080 was refused - did you specify the right host or port?
4. 部署nginxpod
kubectl create deployment nginx --image=nginx
kubectl create service nodeport nginx --tcp=8080:80 service/nginx created
kubectl port-forward --address localhost svc/nginx 8080:8080
curl 127.0.0.1:8080
以上 (yǐ ：以上
