Teach you how to use docker-maven-plugin to automate deployment

1. Introduction to docker-maven-plugin

In our continuous integration process, project engineering generally uses Maven to compile and package, and then generate images. By putting the images online, we can greatly improve the online efficiency, and at the same time, we can quickly and dynamically expand the capacity and quickly roll back, which is really convenient. The docker-maven-plugin plugin is designed to help us automatically generate images and push them to the warehouse through simple configuration in Maven projects.

**effect:

When compiling a project, a docker image can be automatically generated and pushed to a remote repository. You only need to configure it properly in the Maven configuration file pom.xml**

Example 1 (automatically generating a docker image during compilation):

1. Maven configuration:

<plugin>
          <groupId>com.spotify</groupId>
           <artifactId>docker-maven-plugin</artifactId>
           <version>1.0.0</version>
           <configuration>
           <!--Note that imageName must conform to the regular [a-z0-9-_.], otherwise the build will not succeed-->
           <imageName>myserver:v1</imageName>
           <!-- The directory of the Dockerfile is specified, so you need to create a docker directory under the project's src/main and configure the Dockerfile file in its directory-->
           <dockerDirectory>${project.basedir}/src/main/resources/docker</dockerDirectory>
           <skipDockerBuild>false</skipDockerBuild>
           <!-- The contents of resources will be copied to dockerDirectory (that is, the build context) -->
           <resources>
                <resource>
                <targetPath>/</targetPath>
                <directory>${project.build.directory}</directory>
                <include>${project.build.finalName}.jar</include>
                </resource>
          </resources>
     </configuration>
</plugin>

2. Then in the project's src\main\resources\docker (the dockerDirectory directory configured above), create a file named Dockerfile with the following content:

FROM java:8
MAINTAINER blue
ADD mydocker-0.0.1-SNAPSHOT.jar mydocker.jar
ENTRYPOINT ["java", "-jar", "/mydocker.jar"]

3. Set system environment variables to specify the host and port of the docker daemon that needs to be connected. As mentioned earlier, docker is a C/S architecture, docker-maven-plugin plays the role of client, and the server needs environment variables to specify

4. Execute mvn clean install docker:build. After the project is compiled, the image is automatically built. Execute docker images to check whether the image exists:

Example 2 (pushing the image to the warehouse, based on Example 1):

1. Open the Maven configuration file setting.xml and add the warehouse account information:

<servers>
    <server>
        <id>docker-hub</id>
        <username>blueiii</username>
        <password>xxxx</password>
        <configuration>
          <email>[email protected]</email>
        </configuration>
    </server>
  </servers>

2. Modify the pom.xml file, imageName must be consistent with the warehouse path:

<imageName>blueiii/mydocker:v1</imageName>

3. Modify the pom.xml file and add the following configuration

<pushImage>true</pushImage>
<serverId>docker-hub</serverId>
<registryUrl>https://hub.docker.com/</registryUrl>

4. Also execute mvn clean install docker:build to automatically build the image and upload it to docker hub:

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