java - 运行 docker 镜像时无法到达端点

Question

我正在遵循有关如何 dockerize maven springboot 服务器的指南，我可以使用“winpty docker run -it -p 9999:8080 springio/spring-docker-template”成功运行 docker 镜像，但我不能访问其任何端点。即使输出表明 Spring Boot 正在运行。

我尝试过 localhost:8080/users/all 和 localhost:9999/users/all

如果我使用“./mvnw package && java -jar target/spring-docker-template-0.1.0.jar”正常运行应用程序，端点工作正常。

Dockerfile

FROM openjdk:8-jdk-alpine
VOLUME /tmp
ARG DEPENDENCY=target/dependency
COPY ${DEPENDENCY}/BOOT-INF/lib /app/lib
COPY ${DEPENDENCY}/META-INF /app/META-INF
COPY ${DEPENDENCY}/BOOT-INF/classes /app
ENTRYPOINT ["java","-cp","app:app/lib/*","main.Application"]

pom.xml

    <?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">
    <modelVersion>4.0.0</modelVersion>



    <groupId>org.springframework</groupId>
    <artifactId>spring-docker-template</artifactId>
    <version>0.1.0</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <start-class>main.Application</start-class>
        <java.version>1.8</java.version>

        <!-- docker image prefix -->
        <docker.image.prefix>springio</docker.image.prefix>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.6</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <!--docker -->
            <plugin>
                <groupId>com.spotify</groupId>
                <artifactId>dockerfile-maven-plugin</artifactId>
                <version>1.4.9</version>
                <configuration>
                    <!-- In this creates creates: springio/spring-docker-template -->
                    <repository>${docker.image.prefix}/${project.artifactId}</repository>
                </configuration>
            </plugin>
            <!-- Ensures that the jar is unpacked before the docker image -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <executions>
                    <execution>
                        <id>unpack</id>
                        <phase>package</phase>
                        <goals>
                            <goal>unpack</goal>
                        </goals>
                        <configuration>
                            <artifactItems>
                                <artifactItem>
                                    <groupId>${project.groupId}</groupId>
                                    <artifactId>${project.artifactId}</artifactId>
                                    <version>${project.version}</version>
                                </artifactItem>
                            </artifactItems>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

我所采取的步骤可以在此处的自述文件中找到:https://github.com/tago-SE/Server-Dev-Labs/tree/master/spring-docker-template

Answer 1

尝试将 EXPOSE 命令添加到您的 dockerfile，可能是它没有公开端口 8080，因此您无法访问它。

更改了 Dockerfile:

FROM openjdk:8-jdk-alpine
VOLUME /tmp
ARG DEPENDENCY=target/dependency
COPY ${DEPENDENCY}/BOOT-INF/lib /app/lib
COPY ${DEPENDENCY}/META-INF /app/META-INF
COPY ${DEPENDENCY}/BOOT-INF/classes /app
EXPOSE 8080
ENTRYPOINT ["java","-cp","app:app/lib/*","main.Application"]

再次构建您的镜像，然后再次尝试以下步骤。