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DockerAndKubernetes.md

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Steps to build docker image and create kubernetes resources using maven

You can find more details in https://github.com/rohanKanojia/eclipse-jkube-demo-project

Use below content to create a Dockerfile

FROM adoptopenjdk/openjdk11:alpine-jre
MAINTAINER Rakesh Venkatesh
ARG JAR_FILE=target/<file>.jar
WORKDIR  /opt/app
COPY ${JAR_FILE} app.jar
EXPOSE 8080
ENTRYPOINT ["java","-jar","app.jar"]

Step 1. Add spotify maven plugin to build docker images

<plugin>
  <groupId>com.spotify</groupId>
  <artifactId>dockerfile-maven-plugin</artifactId>
  <version>1.4.13</version>
  <executions>
    <execution>
      <id>tag-latest</id>
      <goals>
        <goal>build</goal>
        <goal>tag</goal>
        <goal>push</goal>
      </goals>
      <configuration>
        <tag>latest</tag>
      </configuration>
    </execution>
    <execution>
      <id>tag-version</id>
      <goals>
        <goal>build</goal>
        <goal>tag</goal>
        <goal>push</goal>
      </goals>
      <configuration>
        <tag>${project.version}</tag>
      </configuration>
    </execution>
  </executions>
  <configuration>
    <useMavenSettingsForAuth>true</useMavenSettingsForAuth>
    <repository>docker.io/rakgenius/${project.artifactId}</repository>
    <tag>${project.version}</tag>
    <buildArgs>
      <JAR_FILE>target/${project.build.finalName}.jar</JAR_FILE>
    </buildArgs>
  </configuration>
</plugin>

Resource files will be located under target/classes/META-INF/jkube/kubernetes/

Step 2. Add eclipse jkube to generate resources

Add below line under properties section

<properties>
    <jkube.generator.name>rakgenius/${project.name}:${project.version}</jkube.generator.name>
</properties>

Add the below content under plugins section

<plugins>
  <plugin>
    <groupId>org.eclipse.jkube</groupId>
    <artifactId>kubernetes-maven-plugin</artifactId>
    <version>1.0.0-alpha-4</version>
  </plugin>
<plugins>

Step3. Build and create docker image

mvn clean package -DskipTests
mvn k8s:build

Step 4: Push to docker hub

Push to docker hub using

mvn k8s:push

Step 5: Generate kubernetes resource files

mvn k8s:resource

Step 6: Deploy to kubernetes using

mvn k8s:apply

Getting the logs

mvn k8s:log

Debug the application

mvn k8s:debug

If you just want to generate k8s resources and dont want to build docker image then add the below section under profiles

<plugins>
  <plugin>
    <groupId>org.eclipse.jkube</groupId>
    <artifactId>kubernetes-maven-plugin</artifactId>
    <version>1.0.0-alpha-4</version>
    <executions>
      <execution>
        <goals>
          <goal>resource</goal>
        </goals>
      </execution>
    </executions>
  </plugin>
<plugins>