Drone Java Quickstart

A Java quickstart to show how to use Drone to build and deploy Java application to Kubernetes

Pre-requisites

The following tools are required to run this quickstart,

• Drone CLI
• Docker Desktop
• kind
• Helm
• Kustomize
• JDK 11
• Maven 3.x
• yq
• envsusbst

All linux distributions adds envsubst via gettext package. On macOS it can be installed using Homebrew like brew install gettext.

Clone the sources

git clone https://github.com/kameshsampath/drone-java-quickstart && \
  cd "$(basename "$_" .git)"
export QUICKSTART_HOME="$PWD"

Going forward we will call this folder as $QUICKSTART_HOME in the README.

Setup Environment

Follow my blog post Yours Kindly Drone to prepare your local environment to run Kubernetes and Drone together.

Add Drone Quickstart to Gitea

Deploy Nexus

The Java builds will use Sonatype Nexus as the Apache Maven artifacts repository manager.

kubectl apply -k "$QUICKSTART_HOME/k8s/nexus"

Wait for nexus to be ready,

kubectl rollout status deploy/nexus --timeout=180s

Configure Drone CLI

Copy the settings Example CLI Usage from the drone account settings page http://drone-127.0.0.1.sslip.io:8080/account.

For this quickstart settings running the command drone info should show the following output,

User: demo
Email: [email protected]

Repository Admin

Ensure the Gitea demo user is added as Repository Admin in Drone to allow modifying the required settings.

drone user update demo --admin

Running the command drone user admin info should show the following output,

User: demo
Email: [email protected]
Admin: true
Active: true
Machine: false

Make Repository as Trusted

To run drone in a trusted mode we need to mark the repository as trusted.

Run the following command to mark the drone-java-quickstart as trusted,

drone repo update --trusted demo/drone-java-quickstart

Add Steps to build application

Update the .drone.yml with the following additional steps that allows you to build and test the Java application,

 - name: test-java-application
   image: docker.io/kameshsampath/drone-java-maven-plugin:v1.0.0
   pull: if-not-exists
   settings:
     maven_mirror_url: http://nexus:8081/nexus/content/groups/public/
     goals:
       - clean
       - test
     maven_modules:
       - springboot
 - name: build-java-application
   image: docker.io/kameshsampath/drone-java-maven-plugin:v1.0.0
   pull: if-not-exists
   settings:
     maven_mirror_url: http://nexus:8081/nexus/content/groups/public/
     goals:
       - clean
       - -DskipTests
       - install
     maven_modules:
       - springboot

Add Step to Build the Container Image

- name: build-image
  image: plugins/docker
  settings:
    insecure: false
    repo: localhost:5001/example/drone-java-quickstart
    context: /drone/src/springboot