Deploying Kotlin Ktor application on AWS Elastic Beanstalk using GitHub Actions

Here’s a step-by-step guide to creating a Kotlin Ktor project and deploying it on AWS Elastic Beanstalk using GitHub Actions.

Here is the general architecture diagram that we will be deploying.

---

1. Create a Kotlin Ktor Project

1. Set up the project:

   • Use the Ktor Project Generator to generate a starter project.
   • Choose:
     • Build System: Gradle (Kotlin DSL)
     • Engine: Netty
     • Add features like Serialization, ContentNegotiation, and Routing.

2. Directory structure: Extract and open the project in your IDE (e.g., IntelliJ IDEA).

3. Application entry point: Update the Application.kt file to define routes. Example:

   import io.ktor.application.*
   import io.ktor.response.*
   import io.ktor.routing.*
   import io.ktor.server.engine.*
   import io.ktor.server.netty.*
   
   fun main() {
       embeddedServer(Netty, port = 8080) {
           routing {
               get("/") {
                   call.respondText("Hello, AWS Elastic Beanstalk!")
               }
           }
       }.start(wait = true)
   }

4. Build and test: Run the application locally with:

   ./gradlew run

---

2. Prepare for Deployment to AWS Elastic Beanstalk

1. Install AWS CLI and Elastic Beanstalk CLI: Ensure you have the AWS CLI and the Elastic Beanstalk CLI installed. Authenticate using:

   aws configure

2. Create a Dockerfile: Elastic Beanstalk supports Docker deployments. Create a Dockerfile in the root directory:

   FROM amazoncorretto:17
   WORKDIR /app
   COPY build/libs/*.jar app.jar
   ENTRYPOINT ["java", "-jar", "app.jar"]

3. Add a .ebextensions directory (Optional): Customize your Elastic Beanstalk environment by adding configurations inside the .ebextensions/ directory.

4. Build the JAR: Add the following task to your build.gradle.kts for building a fat JAR:

   tasks {
       val fatJar by creating(Jar::class) {
           group = "build"
           archiveBaseName.set("app")
           archiveVersion.set("1.0")
           duplicatesStrategy = DuplicatesStrategy.EXCLUDE
   
           manifest {
               attributes["Main-Class"] = "com.example.ApplicationKt"
           }
   
           from(configurations.runtimeClasspath.get().map { if (it.isDirectory) it else zipTree(it) })
           with(tasks.jar.get() as CopySpec)
       }
   }

   Build it using:

   ./gradlew fatJar

---

3. Create an Elastic Beanstalk Environment

1. Initialize Elastic Beanstalk:

   eb init

   • Select your AWS region.
   • Choose Docker as the platform.

2. Create an environment:

   eb create ktor-env

---

4. Set Up GitHub Actions for CI/CD

1. Create a GitHub Actions workflow file: Add a .github/workflows/deploy.yml file:

   name: Deploy to AWS Elastic Beanstalk
   
   on:
     push:
       branches:
         - main
   
   jobs:
     deploy:
       runs-on: ubuntu-latest
   
       steps:
         - name: Checkout code
           uses: actions/checkout@v3
   
         - name: Set up JDK
           uses: actions/setup-java@v3
           with:
             distribution: 'corretto'
             java-version: '17'
   
         - name: Cache Gradle dependencies
           uses: actions/cache@v3
           with:
             path: ~/.gradle/caches
             key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
             restore-keys: |
               ${{ runner.os }}-gradle-
   
         - name: Build the application
           run: ./gradlew fatJar
   
         - name: Build Docker image
           run: docker build -t ktor-app .
   
         - name: Deploy to Elastic Beanstalk
           env:
             AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
             AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
             AWS_REGION: us-east-1
           run: |
             eb deploy

2. Add AWS credentials to GitHub: Go to your repository settings → Secrets and variables → Actions, and add:

   • AWS_ACCESS_KEY_ID
   • AWS_SECRET_ACCESS_KEY

---

5. Test the Deployment

1. Push your code to the main branch.
2. GitHub Actions will automatically build and deploy your application to Elastic Beanstalk.
3. Access your application using the Elastic Beanstalk environment URL.

---

By following these steps, you’ll have a Kotlin Ktor application deployed to AWS Elastic Beanstalk with a fully automated GitHub Actions pipeline. 

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