K8S 建立Spring-boot專案並進行專案啟動與訪問

不会游泳的鱼丶發表於2024-05-04
K8SSpringboot

##Spring-boot 的helloworld 專案

package com.example.demo;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import lombok.extern.slf4j.Slf4j;

@RestController
@RequestMapping("/test")
@Slf4j
public class HelloWorldController {

    // 假設 DatePatten 類中定義瞭如下常量  
    // public static final DateTimeFormatter NORM_DATETIME_MS_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");  

    @GetMapping("/test1") // 推薦使用 @GetMapping 而不是 @RequestMapping("/test1")  
    public String test1() {
        // 假設 LocalDateTimeUtil 有一個靜態方法 format 來格式化 LocalDateTime  
        // String formattedDateTime = LocalDateTimeUtil.format(LocalDateTime.now(), DatePatten.NORM_DATETIME_MS_FORMATTER);  

        // 如果沒有 LocalDateTimeUtil，您可以直接使用 DateTimeFormatter  
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
        String formattedDateTime = LocalDateTime.now().format(formatter);

        log.info("執行時間：{}", formattedDateTime); // 使用 log 而不是 System.out.println  
        return "升級之後的專案";
    }
}

編寫Dockerfile

[root@node1 kubectl]# more Dockerfile
#penJDK 17作為基礎映象  
#FROM openjdk:17-jre-slim  
#FROM openjdk:11-jre-slim
FROM eclipse-temurin:17-jre  
  
# 設定工作目錄為/app  
WORKDIR /app  
  
# 將當前目錄中的jar包複製到容器的/app目錄下  
COPY hello-world-0.0.1-SNAPSHOT.jar /app/app.jar  
  
# 暴露應用程式埠（這裡假設你的Spring Boot應用程式在8080埠上執行）  
EXPOSE 8080  
  
# 在容器啟動時執行jar包  
CMD ["java", "-jar", "app.jar"]

構建映象 映象名稱 my-spring-boot-app 版本 v2

[root@node1 kubectl]# docker build -t my-spring-boot-app:v2 .
[+] Building 0.4s (2/2) FINISHED                                                                                                                                                                  docker:default
 => [internal] load build definition from Dockerfile                                                                                                                                                        0.0s
 => => transferring dockerfile: 505B                                                                                                                                                                        0.0s
 => CANCELED [internal] load metadata for docker.io/library/eclipse-temurin:17-jre                                                                                                                          0.4s
ERROR: failed to solve: Canceled: context canceled
[root@node1 kubectl]# docker build -t hello-world-app:v2 .
[+] Building 17.3s (8/8) FINISHED                                                                                                                                                                 docker:default
 => [internal] load build definition from Dockerfile                                                                                                                                                        0.0s
 => => transferring dockerfile: 505B                                                                                                                                                                        0.0s
 => [internal] load metadata for docker.io/library/eclipse-temurin:17-jre                                                                                                                                  16.6s
 => [internal] load .dockerignore                                                                                                                                                                           0.0s
 => => transferring context: 2B                                                                                                                                                                             0.0s
 => [1/3] FROM docker.io/library/eclipse-temurin:17-jre@sha256:15b50cf95210242511c17e1ec8281fd691ad7d34f163c250a21298943d65de87                                                                             0.0s
 => [internal] load build context                                                                                                                                                                           0.2s
 => => transferring context: 21.47MB                                                                                                                                                                        0.2s
 => CACHED [2/3] WORKDIR /app                                                                                                                                                                               0.0s
 => [3/3] COPY hello-world-0.0.1-SNAPSHOT.jar /app/app.jar                                                                                                                                                  0.1s
 => exporting to image                                                                                                                                                                                      0.2s
 => => exporting layers                                                                                                                                                                                     0.1s
 => => writing image sha256:1e8dbdc55dddcc23adfae071a4c8ede5a5f76a5388a822024eb64b9a015c3648                                                                                                                0.0s
 => => naming to docker.io/library/hello-world-app:v2

我這是上傳到阿里雲的映象倉庫 登入阿里雲映象倉庫，並上傳檔案到倉庫 記得替換自己的映象ID tag

https://cr.console.aliyun.com/repository/cn-hangzhou/kubectlte/hello-world-app/details

$ docker login --username=15539211956 registry.cn-hangzhou.aliyuncs.com
$ docker tag 1e8dbdc55ddd registry.cn-hangzhou.aliyuncs.com/kubectlte/hello-world-app:v2
$ docker push registry.cn-hangzhou.aliyuncs.com/kubectlte/hello-world-app:v2

上傳成功後，可以在倉庫檢視

然後編輯 helloworld的yaml 

[root@node1 kubectl]# more helloworld.yaml 
apiVersion: apps/v1
kind: Deployment
metadata: 
  name: k8s-demo
spec: 
  selector: 
    matchLabels: 
      app: k8s-demo
  replicas: 2  #2個副本
 
  template: 
    metadata:
      labels: 
        app: k8s-demo
    spec: 
      containers: 
      - name: k8s-demo
        image: registry.cn-hangzhou.aliyuncs.com/kubectlte/hello-world-app:v1 # 記得改
        ports: 
        - containerPort: 8080
---
# 建立Pod的Service service的80埠指向pod的8080
apiVersion: v1
kind: Service
metadata: 
  name: k8s-demo
spec: 
  type: NodePort
  ports: 
  - port: 7003
    targetPort: 8080
  selector: 
    app: k8s-demo
---

建立pod、service 

[root@node1 kubectl]# kubectl create -f helloworld.yaml

檢視pod

[root@node1 kubectl]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
k8s-demo-6646c6b47b-2rdvp 1/1 Running 0 3h8m 10.244.2.25 node2 <none> <none>
k8s-demo-6646c6b47b-mb599 1/1 Running 0 3h8m 10.244.1.18 node1 <none> <none>

檢視service 

[root@node1 kubectl]# kubectl get service -o wide
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
k8s-demo NodePort 10.101.189.212 <none> 7003:30073/TCP 3h8m app=k8s-demo

檢視 deploy

[root@node1 kubectl]# kubectl get deploy -o wide
NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
k8s-demo 2/2 2 2 3h10m k8s-demo registry.cn-hangzhou.aliyuncs.com/kubectlte/hello-world-app:v1 app=k8s-demo


檢視node

[root@node1 kubectl]# kubectl get node -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
master Ready control-plane,master 6d2h v1.23.0 10.0.4.17 <none> CentOS Linux 7 (Core) 3.10.0-1160.99.1.el7.x86_64 docker://25.0.5
node1 Ready <none> 6d2h v1.23.0 10.0.12.2 <none> CentOS Linux 7 (Core) 3.10.0-1160.108.1.el7.x86_64 docker://25.0.3
node2 Ready <none> 6d2h v1.23.0 10.0.16.3 <none> CentOS Linux 7 (Core) 3.10.0-1160.108.1.el7.x86_64 docker://25.0.3
訪問的話 可以透過 nodeip + port    如 

curl  10.0.12.2:30073/test/test1 進行專案訪問 
curl   10.0.16.3:30073/test/test1 進行專案訪問

需要開通節點的外網的埠 不然無法訪問

kubectl logs -f pod名稱 就可以檢視pod的日誌輸出

K8S 根據映象升級 （我本地有兩個映象 一個是V1 版本 一個是V2 版本 現在 我從V1版本升級到V2版本）

kubectl set image deployment web java=nginx
`#kubectl set image+ 資源型別+名字（web）+ (java=nginx)原映象名=新映象名`
#kubectl edit service/web #如果配置檔案有改動，直接修改server
http://192.168.106.103:30909/ #能夠訪問到最新的專案

#kubectl set image deployment/k8s-demo k8s-demo=registry.cn-hangzhou.aliyuncs.com/kubectlte/hello-world-app:v2

#deployment.apps/k8s-demo image updated

在重新整理訪問瀏覽器就變成了 升級之後的專案了

根據歷史版本進行回滾 

[root@node1 kubectl]#  kubectl rollout history deployment k8s-demo
deployment.apps/k8s-demo 
REVISION  CHANGE-CAUSE
1         <none>
2         <none>

專案部署參考 https://blog.csdn.net/CLanMua/article/details/136189976

idear打包 jar專案參考 https://blog.csdn.net/qq_38306801/article/details/113178551

K8S單機部署參考 https://blog.csdn.net/chj_1224365967/article/details/136365077

K8S叢集搭建 參考 https://zhuanlan.zhihu.com/p/627310856

K8S 日常使用參考 https://blog.csdn.net/chj_1224365967/article/details/117779493

K8S 名詞詳解參考

有狀態-無狀態 https://blog.csdn.net/IT_ZRS/article/details/134040807
Label selector https://blog.csdn.net/IT_ZRS/article/details/134059035

K8S 中文文件社群參考

http://docs.kubernetes.org.cn/317.html

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