手把手教你k8s部署springboot服务

<?xml version="1.0" encoding="UTF-8"?>
​
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>boot-example-advance</artifactId>
        <groupId>com.boot.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
​
    <modelVersion>4.0.0</modelVersion>
    <artifactId>boot-example-docker</artifactId>
    <version>1.0-SNAPSHOT</version>
​
    <name>boot-example-docker</name>
    <url>http://www.example.com</url>
​
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
​
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                            <goal>build-info</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

@SpringBootApplication
@RestController
public class DockerApplication {
​
​
    @GetMapping("/")
    public String home() {
        try {
            return "Hello Docker World：" + InetAddress.getLocalHost().getHostAddress();
        } catch (UnknownHostException e) {
            return "Hello Docker World";
        }
    }
​
    public static void main(String[] args) {
        SpringApplication.run(DockerApplication.class, args);
    }
}

FROM openjdk:8-jdk-alpine
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} app.jar
ENTRYPOINT ["java","-jar","/app.jar"]

kubectl create deployment myapp --image=a601942905/app

kubectl expose deployment myapp --type=NodePort --port=8080

kubectl scale --replicas=5 deployment/myapp

kubectl scale --replicas=3 deployment/myapp

kubectl set image deploy/myapp app=a601942905/app:latest

kubectl rollout undo deploy/myapp