将Go开发的代码部署到k8s集群

一、在服务器上编译go程序

1.1 编译go语言程序

# 安装go
yum install go -y
mkdir /root/test && cd /root/test
# 设置代理
go env -w GOPROXY=https://goproxy.cn,direct

# 创建源码文件

[root@master test]# cat main.go 
package main
import (
    "net/http"
    "github.com/gin-gonic/gin"
)
func statusOKHander(c *gin.Context){
    c.JSON(http.StatusOK,gin.H{"status":"success~welcome to study"})
}

func versionHandler(c *gin.Context){
    c.JSON(http.StatusOK,gin.H{"version":"v1.1版本"})
}

func main() { 
     router := gin.new() 
     router.Use(gin.Recovery()) 
     router.GET("/", statusOKHandler) 
     router.GET("/version", versionHandler) 
     router.Run(":8080") 
}

# Go mod初始化项目
[root@master test]# go mod init test
go: creating new go.mod: module test
go: to add module requirements and sums:
    go mod tidy
[root@master test]# go mod tidy
...
go: downloading gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405
go: downloading golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543

# 构建源码
[root@master test]# CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o k8s-demo main.go
[root@master test]# ll
总用量 10784
-rw-r--r-- 1 root root     1288 8月  30 15:17 go.mod
-rw-r--r-- 1 root root     7701 8月  30 15:17 go.sum
-rwxr-xr-x 1 root root 11024637 8月  30 15:27 k8s-demo
-rw-r--r-- 1 root root      464 8月  30 15:27 main.go

1.2 编写dockerfile文件构建镜像

[root@master test]# cat dockerfile 
FROM alpine 
ADD k8s-demo /data/app/
WORKDIR /data/app/ 
CMD ["/bin/sh","-c","./k8s-demo"]

[root@master test]# docker build -t harbor96.9you.com:6443/tools/k8sdemo:v1 .
[root@master test]# docker images
REPOSITORY                                                                     TAG        IMAGE ID       CREATED          SIZE
harbor96.9you.com:6443/tools/k8sdemo                                           v1         4084cba544d7   23 seconds ago   16.6MB

# 将镜像上传到harbor,并导入到k8s工作节点
[root@master test]# docker save -o k8sdemo.tar.gz harbor96.9you.com:6443/tools/k8sdemo:v1
# 导入镜像
[root@node1 ~]# ctr -n=k8s.io images import k8sdemo.tar.gz

1.3 创建deployment的yaml文件

[root@master test]# cat k8s-demo.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: k8s-demo
  namespace: default
  labels:
    app: k8s-demo
spec:
  selector:
    matchLabels:
      app: k8s-demo
  replicas: 2
  template:
    metadata:
      labels:
        app: k8s-demo
    spec:
      containers:
      - name: k8s-demo
        image: harbor96.9you.com:6443/tools/k8sdemo:v1
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 8080
          protocol: TCP
        resources:
          limits:
            cpu: 100m
            memory: 200Mi
          requests:
            cpu: 50m
            memory: 100Mi
        livenessProbe:
          tcpSocket:
            port: 8080
          initialDelaySeconds: 10
          timeoutSeconds: 3
        readinessProbe:
          httpGet:
            path: /
            port: 8080
          initialDelaySeconds: 10
          timeoutSeconds: 2
---
apiVersion: v1
kind: Service
metadata:
  name: k8s-demo-svc
  namespace: default
  labels:
    app: k8s-demo
spec:
  selector:
    app: k8s-demo
  ports:
  - name: api
    port: 8080
    protocol: TCP
    targetPort: 8080

[root@master test]# kubectl apply -f k8s-demo.yaml 
deployment.apps/k8s-demo created
service/k8s-demo-svc created
[root@master test]# kubectl get pods -o wide
\NAME                             READY   STATUS    RESTARTS   AGE    IP               NODE    NOMINATED NODE   READINESS GATES
k8s-demo-57b577c5c9-6grz5        1/1     Running   0          2m9s   10.244.104.20    node2   <none>           <none>
k8s-demo-57b577c5c9-mc5hb        1/1     Running   0          2m9s   10.244.166.158   node1   <none>           <none>

[root@master test]# kubectl get svc -n default
NAME           TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)             AGE
k8s-demo-svc   ClusterIP   10.105.15.228   <none>        8080/TCP            93s

# 将svc的TYPE类型从ClusterIP改为nodePort
[root@master test]# kubectl edit svc k8s-demo-svc -n default
type: NodePort  # 修改这行
service/k8s-demo-svc edited

[root@master test]# kubectl get svc
NAME           TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)             AGE
k8s-demo-svc   NodePort    10.105.15.228   <none>        8080:30485/TCP      5m19s

# 浏览器访问：
http://192.168.10.10:30485
返回：{"status":"success~welcome to study"}

http://192.168.10.10:30485/version
返回：{"version":"v1.1版本"}