参考：Setup Kubernetes Locally - Deploy SpringBoot Application - Step by Step Tutorial - Kindson The Genius

编写一个SpringBoot项目

项目里面提供一个简单的API

@RestController
public class ApiController {

    @GetMapping(value = "/index")
    public String index(){
        String info = "接口访问成功";
        System.out.println(info);
        return info;
    }
}

目录结果如下：

 

Dockerfile镜像制作

Dockerfile内容编辑

FROM adoptopenjdk/openjdk8:alpine-jre
ADD k8s-demo-0.0.1-SNAPSHOT.jar app.jar
ENTRYPOINT ["java","-jar","/app.jar"]

打成镜像

S F:\lwjCode\k8s-demo\target> docker build -t k8s-demo:0.0.1 .
[+] Building 2.8s (7/7) FINISHED
 => [internal] load build definition from Dockerfile                                                                                                         0.0s
 => => transferring dockerfile: 154B                                                                                                                         0.0s
 => [internal] load .dockerignore                                                                                                                            0.0s
 => => transferring context: 2B                                                                                                                              0.0s
 => [internal] load metadata for docker.io/adoptopenjdk/openjdk8:alpine-jre                                                                                  2.3s
 => [internal] load build context                                                                                                                            0.2s
 => => transferring context: 25.26MB                                                                                                                         0.2s
 => CACHED [1/2] FROM docker.io/adoptopenjdk/openjdk8:alpine-jre@sha256:a57843f7e988613cc9bbe15b90573b7bfea3b7adb06d81624e6abac9393de2f3                     0.0s
 => [2/2] ADD k8s-demo-0.0.1-SNAPSHOT.jar app.jar                                                                                                            0.1s
 => exporting to image                                                                                                                                       0.1s
 => => exporting layers                                                                                                                                      0.1s
 => => writing image sha256:dbaf5b173b66e86259d3cb7683efd6a241ff5b10aa86f8b6c0d5eeb75f410ebb                                                                 0.0s
 => => naming to docker.io/library/k8s-demo:0.0.1                                                                                                            0.0s

Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them
PS F:\lwjCode\k8s-demo\target>

K8s服务发布

C:\Users\boonya>kubectl create deployment k8s-demo --image=k8s-demo:0.0.1 --port=8080
deployment.apps/k8s-demo created

C:\Users\boonya>kubectl get pods
NAME                        READY   STATUS    RESTARTS     AGE
k8s-demo-7c55fc656d-qbgbl   1/1     Running   0            7s
nginx-565785f75c-w4zsk      1/1     Running   1 (8h ago)   2d4h

C:\Users\boonya>kubectl logs k8s-demo-7c55fc656d-qbgbl

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.3.6.RELEASE)

2023-03-10 09:31:07.072  INFO 1 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication v0.0.1-SNAPSHOT on k8s-demo-7c55fc656d-qbgbl with PID 1 (/app.jar started by root in /)
2023-03-10 09:31:07.076  INFO 1 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default
2023-03-10 09:31:07.720  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2023-03-10 09:31:07.729  INFO 1 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2023-03-10 09:31:07.730  INFO 1 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.39]
2023-03-10 09:31:07.773  INFO 1 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2023-03-10 09:31:07.773  INFO 1 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 664 ms
2023-03-10 09:31:08.045  INFO 1 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2023-03-10 09:31:08.164  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2023-03-10 09:31:08.170  INFO 1 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 1.358 seconds (JVM running for 1.622)

C:\Users\boonya>kubectl expose deployment k8s-demo --type=NodePort
service/k8s-demo exposed

C:\Users\boonya>kubectl service k8s-demo
Error: unknown command "service" for "kubectl"
Run 'kubectl --help' for usage.

C:\Users\boonya>kubectl get pods
NAME                        READY   STATUS    RESTARTS     AGE
k8s-demo-7c55fc656d-qbgbl   1/1     Running   0            3m28s
nginx-565785f75c-w4zsk      1/1     Running   1 (8h ago)   2d4h

C:\Users\boonya>kubectl get pods -o wide
NAME                        READY   STATUS    RESTARTS     AGE     IP           NODE             NOMINATED NODE   READINESS GATES
k8s-demo-7c55fc656d-qbgbl   1/1     Running   0            5m51s   10.1.2.132   docker-desktop   <none>           <none>
nginx-565785f75c-w4zsk      1/1     Running   1 (8h ago)   2d4h    10.1.2.126   docker-desktop   <none>           <none>

C:\Users\boonya>kubectl port-forward k8s-demo 8080:8080
Error from server (NotFound): pods "k8s-demo" not found

C:\Users\boonya>kubectl port-forward k8s-demo-7c55fc656d-qbgbl 8080:8080
Forwarding from 127.0.0.1:8080 -> 8080
Forwarding from [::1]:8080 -> 8080
Handling connection for 8080
Handling connection for 8080

C:\Users\boonya>kubectl logs k8s-demo-7c55fc656d-qbgbl

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.3.6.RELEASE)

2023-03-10 09:31:07.072  INFO 1 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication v0.0.1-SNAPSHOT on k8s-demo-7c55fc656d-qbgbl with PID 1 (/app.jar started by root in /)
2023-03-10 09:31:07.076  INFO 1 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default
2023-03-10 09:31:07.720  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2023-03-10 09:31:07.729  INFO 1 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2023-03-10 09:31:07.730  INFO 1 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.39]
2023-03-10 09:31:07.773  INFO 1 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2023-03-10 09:31:07.773  INFO 1 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 664 ms
2023-03-10 09:31:08.045  INFO 1 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2023-03-10 09:31:08.164  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2023-03-10 09:31:08.170  INFO 1 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 1.358 seconds (JVM running for 1.622)
2023-03-10 09:39:14.946  INFO 1 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2023-03-10 09:39:14.947  INFO 1 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2023-03-10 09:39:14.963  INFO 1 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 16 ms
接口访问成功
接口访问成功
接口访问成功
接口访问成功

C:\Users\boonya>

浏览器访问服务：

 上面是通过进行port-forward

kubectl port-forward: Kubernetes Port Forwarding Guide | phoenixNAP KB

端口暴露访问的,语法如下：

kubectl port-forward [resource-type]/[resource-name] [local-port]:[resource-port]

直接发布出来的服务是一个容器内IP地址，不可访问，下一步深入探究如何不通过port-forward进行服务访问。