关于k8s:将自己的go应用部署到K8S

通过如下几步能够将本人的go利用部署到k8s上

首先生成本人的go我的项目
```
mkdir srccd srcgo mod init servertest
```

编写测试代码main.go内容如下，很简略

package mainimport (        "github.com/gin-gonic/gin"        "fmt"        "time"        "net/http")type getTimeResp struct {        CTime string}func getTimeHandler(ctx *gin.Context) {        content := fmt.Sprintf("%d", time.Now().Nanosecond())        fmt.Printf("%s\n", content)        resp := &getTimeResp{                CTime:content,        }        ctx.JSON(http.StatusOK, resp)}func main() {        r := gin.Default()        r.GET("/gettime", getTimeHandler)        r.Run(":8000")}

编写Dockerfile内容如下

FROM golang:1.17.1-alpine as builderENV GOPROXY=https://goproxy.cnWORKDIR /buildCOPY ./src .RUN mkdir /appRUN go mod tidyRUN go build FROM  alpine:latestRUN mkdir -p /cmdWORKDIR  /cmdCOPY  --from=builder /build/servertest  .EXPOSE 8000CMD ["./servertest"]

生成镜像，执行命令

docker build -t servertest:1.0.0 -f Dockerfile .

执行

docker images

能够看到生成的servertest:1.0.0镜像曾经存在了

因为k8s集群会存在多个nod所以多个nod都须要拉取镜像，所以须要保本人的镜像推到镜像服务器，我这里选用阿里的。
先登陆->将本人生成的镜像打tag->推到镜像服务器

docker login --username=your_loginname_xxxx registry.cn-shanghai.aliyuncs.comdocker tag servertest:1.0.0 registry.cn-shanghai.aliyuncs.com/your_hubname_xxxx/servertest:1.0.0docker push registry.cn-shanghai.aliyuncs.com/your_hubname_xxxx/servertest:1.0.0

编写deployment和service配置文件
deployment.yaml文件内容如下

apiVersion: apps/v1kind: Deploymentmetadata:  name: my-go-appspec:  replicas: 3  selector:    matchLabels:      app: my-go-app  template:    metadata:      labels:        app: my-go-app    spec:      containers:        - name: go-app-container          image: registry.cn-shanghai.aliyuncs.com/your_hubname_xxxx/servertest:1.0.0          imagePullPolicy: IfNotPresent          resources:            limits:              memory: "512Mi"              cpu: "500m"            requests:              memory: "64Mi"              cpu: "100m"          ports:          - containerPort: 8000

service.yaml内容如下

apiVersion: v1kind: Servicemetadata:  name: servertest-servicespec:  type: NodePort  ports:    - port: 8000      nodePort: 30066  selector:    app: my-go-app

须要对外提供服务所以type选NodePort
port：8000是对应pod的端口号
nodePort：30066是service对外提供的调用端口号

部署
执行
```
kubectl create -f ./yaml/deployment.yamlkubectl create -f ./yaml/service.yaml
```
查看pod和service情况
```
kubectl get pod,svc -n default
```
能够看到如下
三个pod(my-go-app-xxxxxx-xxxx)处在Running状态
service的Port30066对外提供服务
拜访确认
查看任何一个node的物理IP地址，通过拜访node主机的IP：30066/gettime
会返回以后工夫（nano second）