入门教程:部署spring"/>
Kubernetes微服务入门教程:部署spring
测试如下教程时,请确认kubernates环境正常,可参考该文件搭建kubernates环境Kubernetes微服务入门教程:环境安装_jacarri的博客-CSDN博客。
创建一个Spring boot应用
访问 spring boot应用,如下图所示
添加测试和制作镜像的代码
添加用于测试java代码
@RestController
public class HelloWorldController {@RequestMapping("/")public String index() {return "Hello World\t" + new Date();}
}
添加用于制作镜像的文件:src/main/docker/Dockerfile,文件内容如下:
FROM openjdk:8-jdk-oracleADD spring-boot-demo-0.0.1-SNAPSHOT.jar /app.jarENV TZ=Asia/ShanghaiENTRYPOINT [ "java", "-jar", "/app.jar" ]
在pom.xml 添加用于制作镜像的 docker-maven-plugin 插件
<properties><java.version>1.8</java.version><maven.compiler.source>${java.version}</maven.compiler.source><maven.compiler.target>${java.version}</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><docker.image.prefix>jacarrichan</docker.image.prefix></properties>...<plugin><groupId>com.spotify</groupId><artifactId>docker-maven-plugin</artifactId><version>1.2.2</version><executions><execution><phase>package</phase><goals><goal>build</goal></goals></execution></executions><configuration><imageName>${docker.image.prefix}/${project.artifactId}</imageName><dockerDirectory>${project.basedir}/src/main/docker</dockerDirectory><imageTags><imageTag>${project.version}</imageTag><imageTag>latest</imageTag></imageTags><resources><resource><targetPath>/</targetPath><directory>${project.build.directory}</directory><include>${project.build.finalName}.jar</include></resource></resources></configuration></plugin>
...
添加用于声明Kubernates服务的yml文件,内容如下:
apiVersion: v1
kind: Service
metadata:name: spring-boot-demolabels:app: spring-boot-demo
spec:type: NodePortports:- name: httpport: 8080nodePort: 30000 # 此处定义POD的端口8080映射为Node的30000selector:app: spring-boot-demo---
apiVersion: apps/v1
kind: Deployment
metadata:name: spring-boot-demo
spec:replicas: 1selector:matchLabels:app: spring-boot-demotemplate:metadata:labels:app: spring-boot-demospec:containers:- name: spring-boot-demoimage: jacarrichan/spring-boot-demo:0.0.1-SNAPSHOTports:- name: httpcontainerPort: 8080 # 此处定义POD暴露的端口
代码打包和制作镜像
PS C:\Users\jacarrichan\temp\spring-boot-demo> mvn clean package -DskipTests
[INFO] Scanning for projects...
[INFO]
[INFO] ---------------< com.jacarrichan.demo:spring-boot-demo >----------------
[INFO] Building spring-boot-demo 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:3.1.0:clean (default-clean) @ spring-boot-demo ---
[INFO] Deleting C:\Users\jacarrichan\temp\spring-boot-demo\target
[INFO]
[INFO] --- maven-resources-plugin:3.2.0:resources (default-resources) @ spring-boot-demo ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Using 'UTF-8' encoding to copy filtered properties files.
[INFO] Copying 1 resource
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ spring-boot-demo ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 2 source files to C:\Users\jacarrichan\temp\spring-boot-demo\target\classes
[INFO]
[INFO] --- maven-resources-plugin:3.2.0:testResources (default-testResources) @ spring-boot-demo ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Using 'UTF-8' encoding to copy filtered properties files.
[INFO] skip non existing resourceDirectory C:\Users\jacarrichan\temp\spring-boot-demo\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) @ spring-boot-demo ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to C:\Users\jacarrichan\temp\spring-boot-demo\target\test-classes
[INFO]
[INFO] --- maven-surefire-plugin:2.22.2:test (default-test) @ spring-boot-demo ---
[INFO] Tests are skipped.
[INFO]
[INFO] --- maven-jar-plugin:3.2.2:jar (default-jar) @ spring-boot-demo ---
[INFO] Building jar: C:\Users\jacarrichan\temp\spring-boot-demo\target\spring-boot-demo-0.0.1-SNAPSHOT.jar
[INFO]
[INFO] --- spring-boot-maven-plugin:2.6.6:repackage (repackage) @ spring-boot-demo ---
[INFO] Replacing main artifact with repackaged archive
[INFO]
[INFO] --- docker-maven-plugin:1.2.2:build (default) @ spring-boot-demo ---
[INFO] Using authentication suppliers: [ConfigFileRegistryAuthSupplier]
[INFO] Copying C:\Users\jacarrichan\temp\spring-boot-demo\target\spring-boot-demo-0.0.1-SNAPSHOT.jar -> C:\Users\jacarrichan\temp\spring-boot-demo\target\docker\spring-boot-demo-0.0.1-SNAPSHOT.jar
[INFO] Copying C:\Users\jacarrichan\temp\spring-boot-demo\src\main\docker\Dockerfile -> C:\Users\jacarrichan\temp\spring-boot-demo\target\docker\Dockerfile
[INFO] Building image jacarrichan/spring-boot-demo
Step 1/4 : FROM openjdk:8-jdk-oracle---> 5783fe09fd20
Step 2/4 : ADD spring-boot-demo-0.0.1-SNAPSHOT.jar /app.jar---> 4c07a1a20273
Step 3/4 : ENV TZ=Asia/Shanghai---> Running in cc7f05568a73
Removing intermediate container cc7f05568a73---> dac566480459
Step 4/4 : ENTRYPOINT [ "java", "-jar", "/app.jar" ]---> Running in a9a9088ac338
Removing intermediate container a9a9088ac338---> 98cf1242fba2
ProgressMessage{id=null, status=null, stream=null, error=null, progress=null, progressDetail=null}
Successfully built 98cf1242fba2
Successfully tagged jacarrichan/spring-boot-demo:latest
[INFO] Built jacarrichan/spring-boot-demo
[INFO] Tagging jacarrichan/spring-boot-demo with 0.0.1-SNAPSHOT
[INFO] Tagging jacarrichan/spring-boot-demo with latest
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 11.186 s
[INFO] Finished at: 2022-04-10T19:42:30+08:00
[INFO] ------------------------------------------------------------------------
PS C:\Users\jacarrichan\temp\spring-boot-demo>
确认镜像信息
在Docker Desktop中查看制作的镜像
在kubernates中运行spring-boot-demo应用
创建Pod运行应用
PS C:\Users\jacarrichan\temp\spring-boot-demo> kubectl create -f .\k8s.yaml
service/spring-boot-demo created
deployment.apps/spring-boot-demo created
PS C:\Users\jacarrichan\temp\spring-boot-demo>
查看应用运行日志日志
获取SVC信息
PS C:\Users\jacarrichan\temp\spring-boot-demo> kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 9d
spring-boot-demo NodePort 10.107.197.80 <none> 8080:30000/TCP 2m12s
从中可以看到spring-boot-demo 这个Service的 8080端口被映射为了30000端口。
在访问30000端口,测试链路状态信息:
查看POD 详细信息命令
PS C:\Users\jacarrichan\temp\spring-boot-demo> kubectl get pods
NAME READY STATUS RESTARTS AGE
spring-boot-demo-d8bdc7896-7d4l4 1/1 Running 0 7m39s
PS C:\Users\jacarrichan\temp\spring-boot-demo> kubectl describe pod spring-boot-demo-d8bdc7896-7d4l4
Name: spring-boot-demo-d8bdc7896-7d4l4
Namespace: default
Priority: 0
Node: docker-desktop/192.168.65.4
Start Time: Sun, 10 Apr 2022 19:46:15 +0800
Labels: app=spring-boot-demopod-template-hash=d8bdc7896
Annotations: <none>
Status: Running
IP: 10.1.1.188
IPs:IP: 10.1.1.188
Controlled By: ReplicaSet/spring-boot-demo-d8bdc7896
Containers:spring-boot-demo:Container ID: docker://e05adb4204782ab6851e86eb6eee97e2fc9027cf4bcac405acf3d3c0bcf0d821Image: jacarrichan/spring-boot-demo:0.0.1-SNAPSHOTImage ID: docker://sha256:98cf1242fba27986e06b26549d42417af93bf6a313d3490ef6a844507d0546f4Port: 8080/TCPHost Port: 0/TCPState: RunningStarted: Sun, 10 Apr 2022 19:46:16 +0800Ready: TrueRestart Count: 0Environment: <none>Mounts:/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-mgdks (ro)
Conditions:Type StatusInitialized True Ready True ContainersReady True PodScheduled True
Volumes:kube-api-access-mgdks:Type: Projected (a volume that contains injected data from multiple sources)TokenExpirationSeconds: 3607ConfigMapName: kube-root-ca.crtConfigMapOptional: <nil>DownwardAPI: true
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300snode.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:Type Reason Age From Message---- ------ ---- ---- -------Normal Scheduled 7m42s default-scheduler Successfully assigned default/spring-boot-demo-d8bdc7896-7d4l4 to docker-desktopNormal Pulled 7m42s kubelet Container image "jacarrichan/spring-boot-demo:0.0.1-SNAPSHOT" already present on machineNormal Created 7m42s kubelet Created container spring-boot-demoNormal Started 7m42s kubelet Started container spring-boot-demo
本教程中涉及到的代码可从此处获取:
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