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KTLN-630 - Kotlin Application Deployment with Docker and Kubernetes (#1121)
* feat: deploy kotlin app to k8s * fix: no tests
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‎kotlin-docker/.gitignore

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/bin/
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#ignore gradle
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.gradle/
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#ignore build and generated files
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build/
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node/
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out/
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#ignore installed node modules and package lock file
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node_modules/
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package-lock.json

‎kotlin-docker/README.md

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## Relevant Articles

‎kotlin-docker/dockerk8s/Dockerfile

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# Use an official OpenJDK runtime as a parent image
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FROM openjdk:17-jdk-slim
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# Set the working directory in the container
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WORKDIR /app
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# Copy the JAR file into the container
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COPY ../target/kotlin-app.jar /app/kotlin-app.jar
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# Run the application
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CMD ["java", "-jar", "/app/kotlin-app.jar"]

‎kotlin-docker/dockerk8s/deployment.yaml

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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: kotlin-app-deployment
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: kotlin-app
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template:
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metadata:
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labels:
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app: kotlin-app
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spec:
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containers:
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- name: kotlin-app-container
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image: DOCKER_IMAGE
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ports:
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- containerPort: 8080

‎kotlin-docker/dockerk8s/service.yaml

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apiVersion: v1
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kind: Service
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metadata:
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name: kotlin-app
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spec:
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type: NodePort
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ports:
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- port: 8080
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targetPort: 8080
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nodePort: 30000
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selector:
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app: kotlin-app

‎kotlin-docker/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>kotlin-docker</artifactId>
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<name>kotlin-docker</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-boot-3</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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<relativePath>../parent-boot-3</relativePath>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.jetbrains.kotlin</groupId>
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<artifactId>kotlin-reflect</artifactId>
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<version>${kotlin.version}</version>
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</dependency>
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<dependency>
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<groupId>org.jetbrains.kotlin</groupId>
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<artifactId>kotlin-stdlib</artifactId>
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<version>${kotlin.version}</version>
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</dependency>
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</dependencies>
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<build>
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<sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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<plugin>
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<groupId>org.jetbrains.kotlin</groupId>
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<artifactId>kotlin-maven-plugin</artifactId>
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<version>${kotlin.version}</version>
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<configuration>
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<args>
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<arg>-Xjsr305=strict</arg>
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</args>
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<compilerPlugins>
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<plugin>spring</plugin>
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</compilerPlugins>
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</configuration>
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<dependencies>
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<dependency>
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<groupId>org.jetbrains.kotlin</groupId>
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<artifactId>kotlin-maven-allopen</artifactId>
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<version>${kotlin.version}</version>
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</dependency>
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</dependencies>
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</plugin>
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</plugins>
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</build>
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<profiles>
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<profile>
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<id>docker-k8s</id>
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<build>
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<finalName>kotlin-app</finalName>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-shade-plugin</artifactId>
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<version>3.2.4</version>
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<executions>
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<execution>
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<phase>package</phase>
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<goals>
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<goal>shade</goal>
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</goals>
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<configuration>
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<transformers>
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<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
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<mainClass>com.baeldung.dockerk8s.ApplicationKt</mainClass>
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</transformer>
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</transformers>
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</configuration>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</profile>
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</profiles>
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</project>

‎kotlin-docker/src/main/kotlin/com/baeldung/dockerk8s/Application.kt

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package com.baeldung.dockerk8s
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import org.springframework.boot.autoconfigure.SpringBootApplication
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import org.springframework.boot.runApplication
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@SpringBootApplication
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class Application
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fun main(args: Array<String>) {
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runApplication<Application>(*args)
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}

‎kotlin-docker/src/main/kotlin/com/baeldung/dockerk8s/HelloController.kt

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package com.baeldung.dockerk8s
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import org.springframework.http.ResponseEntity
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import org.springframework.web.bind.annotation.GetMapping
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import org.springframework.web.bind.annotation.RequestMapping
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import org.springframework.web.bind.annotation.RestController
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@RestController
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@RequestMapping("/api")
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class HelloController {
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@GetMapping("/hello")
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fun hello(): ResponseEntity<String> {
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return ResponseEntity.ok("Hello From Docker and Kubernetes!")
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}
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}

‎pom.xml

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<module>kotlin-blockchain</module>
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<module>kotlin-testing</module>
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<module>kotlin-mockito</module>
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<module>kotlin-docker</module>
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<!-- <module>kotlin-tornadofx</module> --> <!-- not compatible with Java 9+ -->
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<module>kotlin-kover</module>
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<module>ktlint-custom</module>

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