Kubernetes Minikube
centos7
安装VirtualBox
/etc/yum.repos.d/下新建VirtualBox.repo文件，内容如下：
[virtualbox]
name=Oracle Linux / RHEL / CentOS-$releasever / $basearch - VirtualBox
baseurl=http://download.virtualbox.org/virtualbox/rpm/el/$releasever/$basearch
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://www.virtualbox.org/download/oracle_vbox.asc执行如下的命令安装VirtualBox
yum install VirtualBox-5.2注意： 由于VirtualBox不能安装在虚拟机内，所以像阿里云这种云平台里的主机都是不能用来安装Minikube的，只能在非虚拟机内使用；
启动Minikube
chenzhenyang@chenzhenyang:~/kubernetes-workspace$ minikube start --registry-mirror=https://registry.docker-cn.com
chenzhenyang@chenzhenyang:~/kubernetes-workspace$ minikube addons list
- coredns: disabled
- heapster: enabled
- efk: disabled
- addon-manager: enabled
- default-storageclass: enabled
- kube-dns: enabled
- ingress: enabled
- registry: disabled
- registry-creds: disabled
- dashboard: enabled
- storage-provisioner: enabled
查看kube-dns/ingress/dashboard等是否开启，minikube addons enable xx可以开启指定的addon；
创建应用
目标：创建一个Deployment，让K8s根据Deployment的配置，自动创建两个Tomcat9容器，在Pod之上创建一个Service，在Service之上创建Ingress对象；
[tomcat9-deployment.yaml]
apiVersion: apps/v1beta2
kind: Deployment
metadata:
name: tomcat-deployment
spec:
selector:
matchLabels:
app: tomcat9
replicas: 2
template:
metadata:
labels:
app: tomcat9
spec:
containers:
- name: tomcat9
image: tomcat:9
ports:
- containerPort: 8080[tomcat9-service.yaml]
apiVersion: v1
kind: Service
metadata:
name: tomcat9
spec:
type: NodePort
ports:
- port: 8080
targetPort: 8080
nodePort: 31001
selector:
app: tomcat9[tomcat9-ingress.yaml]
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: tomcat9-ingress
annotations:
ingress.kubernetes.io/rewrite-target: /
spec:
rules:
- http:
paths:
- path: /docs
backend:
serviceName: tomcat9
servicePort: 8080验证
tomcat
chenzhenyang@chenzhenyang:~/kubernetes-workspace$ kubectl cluster-info //获取集群的IP地址tomcat主页面：http://cluster-info#ip:31001
tomcat doc页面：https://cluster-info#ip/docs/
kube api service local proxy
chenzhenyang@chenzhenyang:~/kubernetes-workspace$ kubectl proxy在本机开启8001端口，代理minikube集群的Kube Api Server服务；
addon与service
chenzhenyang@chenzhenyang:~/kubernetes-workspace$ kubectl get service --all-namespaces=true执行上边的命令发现kube-system下有如下的service
kube-system default-http-backend NodePort 10.0.0.212 <none> 80:30001/TCP 4h
kube-system heapster ClusterIP 10.0.0.70 <none> 80/TCP 4h
kube-system kubernetes-dashboard NodePort 10.0.0.190 <none> 80:30000/TCP 5h
kube-system monitoring-grafana NodePort 10.0.0.97 <none> 80:30002/TCP 4h
kube-system monitoring-influxdb ClusterIP 10.0.0.252 <none> 8083/TCP,8086/TCP 4h这是enable了对应的addon，kubernetes自己创建的；这些service的名字和对于addon的名字可以直接对上号；default-http-backend Service是开启了Ingress addon之后，K8s创建的，主要是在通过Ingress访问Service时提供404等通用页面；
参考
Running Kubernetes Locally via Minikube
https://www.virtualbox.org/wiki/Linux_Downloads
Minikube - Kubernetes本地实验环境
Minikube：轻松创建单机版 Kubernetes 集群
Kubernetes - 使用kubectl proxy