Kubernetes—使用Minikube搭建Nginx集群 #32
Description
目标
使用Minikube，在Kubernetes上搭建一个Nginx集群（3个节点）
备注：对于如何安装环境，请点击这里
开发环境
| 名称 | 版本号 |
|---|---|
| Kubernetes | V1.7 |
| minikube | v0.21.0 |
| kubectl-Client | v1.7.4 |
| kubectl-Server | v1.7.0 |
| 操作系统 | MacOS |
➜ ~ minikube version
minikube version: v0.21.0
➜ ~ kubectl version
Client Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.4", GitCommit:"793658f2d7ca7f064d2bdf606519f9fe1229c381", GitTreeState:"clean", BuildDate:"2017-08-17T17:03:51Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.0", GitCommit:"d3ada0119e776222f11ec7945e6d860061339aad", GitTreeState:"clean", BuildDate:"2017-07-26T00:12:31Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}
yaml配置文件
创建 nginx-controller.yaml
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: nginx-deployment
spec:
replicas: 3
template:
metadata:
labels:
name: nginx
spec:
containers:
- name: nginx
image: nginx:1.7.9
ports:
- containerPort: 80创建 nginx-service.yaml
apiVersion: v1
kind: Service
metadata:
name: nginx-service
labels:
name: nginx-service
spec:
type: NodePort
ports:
- port: 80
nodePort: 30001
targetPort: 80
selector:
name: nginx创建步骤
➜ kubectl create -f nginx-controller.yaml
➜ kubectl get deployment
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
nginx-deployment 3 3 3 3 10m
➜ kubectl get pod
nginx-deployment-1969926507-cs4xb 1/1 Running 0 11m
nginx-deployment-1969926507-dc8nh 1/1 Running 0 11m
nginx-deployment-1969926507-nmtxp 1/1 Running 0 11m
➜ kubectl create -f nginx-service.yaml
➜ kubectl get service
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
nginx-service 10.0.0.104 <nodes> 80:30001/TCP 9m
备注： 这里的 80:30001, 对应的是：service端口:主机Node端口
验证
➜ minikube ip
192.168.99.100
➜ test curl 192.168.99.100:30001
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
网络拓扑图
网络映射关系：
主机Node-192.168.99.100:30001 <----> Service-10.0.0.104:80 <----> Deployment(3个Pod)-(端口：80; Label： name: nginx)
Service 通过 Label Select 找到 “name: nginx” 标签的Pod，通过内部的iptables进行路由映射，映射到对应Pod的80端口。