spring-boot集成docker部署

本章介绍spring-boot项目docker化构件，利用maven插件把spring-boot项目构件成docker镜像，并上传到自己的docker私服nexus3上。

官方参考例子：
https://spring.io/guides/gs/spring-boot-docker/

快速在本机构件spring-boot项目镜像

1.新建spring-boot项目。
通过https://start.spring.io/
2.在项目根目录下添加Dockerfile文件，并编辑内容如下：

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/*","hello.Application"]    

3.配置maven插件，编辑pom.xml，添加：
dockerfile-maven 插件

<properties>
   <docker.image.prefix>springio</docker.image.prefix>
</properties>
<build>
    <plugins>
        <plugin>
            <groupId>com.spotify</groupId>
            <artifactId>dockerfile-maven-plugin</artifactId>
            <version>1.4.9</version>
            <configuration>
                <repository>${docker.image.prefix}/${project.artifactId}</repository>
                <tag>${project.version}</tag>
            </configuration>
        </plugin>
    </plugins>
</build>

参数说明：

• repository：指定镜像名称。
• tag: 指定镜像标签，如果不指定，则默认是latest。

为了确保在构件docker镜像之前，spring-boot jar包是解压的，添加下面插件配置：

<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>

4.执行命令构件docker镜像

$ ./mvnw install dockerfile:build

或者(如果么有mvnw)

mvn install dockerfile:build

上传到docker私服

1.配置setting.xml

<server>
  <id>ip:8082</id>
  <username>admin</username>
  <password>admin123</password>
</server>

注意id，必须为私服地址。

2.配置pom.xml

<plugins>
    <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
    </plugin>
    <!-- tag::plugin[] -->
    <plugin>
        <groupId>com.spotify</groupId>
        <artifactId>dockerfile-maven-plugin</artifactId>
        <version>1.4.9</version>
        <configuration>
            <repository>119.145.41.171:8082/${docker.image.prefix}/${project.artifactId}</repository>
            <tag>${project.version}</tag>
            <useMavenSettingsForAuth>true</useMavenSettingsForAuth>
        </configuration>
    </plugin>
    <!-- end::plugin[] -->

    <!-- tag::unpack[] -->
    <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>
    <!-- end::unpack[] -->
</plugins>

重点两个参数：

• repository：需要加上私服地址。
• useMavenSettingsForAuth：设置为true。

3.执行命令构建并上传镜像到私服

mvn clean install dockerfile:push   

绑定maven执行阶段

<plugins>
    <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
    </plugin>
    <!-- tag::plugin[] -->
    <plugin>
        <groupId>com.spotify</groupId>
        <artifactId>dockerfile-maven-plugin</artifactId>
        <version>1.4.9</version>
        <executions>
            <execution>
              <id>default</id>
              <goals>
                <goal>build</goal>
                <goal>push</goal>
              </goals>
            </execution>
         </executions>
        <configuration>
            <repository>119.145.41.171:8082/${docker.image.prefix}/${project.artifactId}</repository>
            <tag>${project.version}</tag>
            <useMavenSettingsForAuth>true</useMavenSettingsForAuth>
        </configuration>
    </plugin>
    <!-- end::plugin[] -->

    <!-- tag::unpack[] -->
    <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>
    <!-- end::unpack[] -->
</plugins>

这样子就可以使用mvn package,mvn deploy命令了。也可以精准使用mvn dockerfile:build。

启动容器

$ docker run -e "SPRING_PROFILES_ACTIVE=prod" -p 8080:8080 -t springio/gs-spring-boot-docker

或者

$ docker run -e "SPRING_PROFILES_ACTIVE=dev" -p 8080:8080 -t springio/gs-spring-boot-docker

调试容器内的应用