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Deployment Manual / Version 2301

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The java-application-base Configuration
<configuration>
  <container>
    <entrypoint>INHERIT</entrypoint> 1
    <args>
      <arg>application</arg> 2
    </args>
    <user>coremedia:coremedia</user> 3
    <environment> 4
      <JAVA_HEAP>256m</JAVA_HEAP>
      <JAVA_PARALLEL_GC>true</JAVA_PARALLEL_GC>
      <SPRING_BOOT_EXPLODED_APP>true</SPRING_BOOT_EXPLODED_APP> 5
      <SPRING_BOOT_EXPLODED_MAINCLASS>@jib-main-class-file</SPRING_BOOT_EXPLODED_MAINCLASS> 6
      <SPRING_BOOT_EXPLODED_CLASSPATH>@jib-classpath-file</SPRING_BOOT_EXPLODED_CLASSPATH> 7
    </environment>
    <ports>
      <port>8080</port>
      <port>8081</port>
      <port>8199</port> 8
    </ports>
  </container>
</configuration>

1

With this directive, we tell Jib to inherit the entrypoint information from the base image. In this case it is /coremedia/entrypoint.sh.

2

The argument to the entrypoint script. The application script encapsulates the startup logic. Visit the DockerHub page of the coremedia/java-application-base image for more details.

3

The user to start the application. With this base image, we need to use the coremedia user to start the application.

4

The environment variables the application entrypoint chain script can be configured.

5

With this environment variable we tell the script to extract or expect an extracted spring boot app in the image. Jib always extracts the application, because of the Spring-Boot layered jar approach.

6

The application starter class we defined in the properties section above.

7

The classloader classpath. This mimics the classloading, the Spring-Boot Jib extension automatically sets.

8

With the java-application-base image, we can activate the jmx-prometheus-agent. With the distroless approach either using the prometheus actuator is the preferred way.

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