Docker Image OpenJDK Headless

Support hot reload using PM2

• OS image: Alpine Linux
• Base OpenJDK image: zulu-openjdk source
• Hot Reload: PM2 Documentation
• Supervisor Documentation

Setup docker image multiple platform:

• Multi-platform images
• Docker container driver

Platform build images:

• amd64
• arm64

Docker image spec:

Tag	OpenJDK	Node Js	PM2
20	OpenJDK JRE Headless 20-latest	18.17.1-r0	5.3.0
19	OpenJDK JRE Headless 19-latest	18.17.1-r0	5.3.0

To Do's

• ✅ Prepare Docker buildx setup
• ✅ Manual build Docker image
• ✅ Manual publish Docker image
• ⬜ Automatic build Docker image (GitHub workflows)
• ⬜ Automatic publish Docker image (GitHub workflows)

Makefile Commands

Helping utility commands for simple build and push Docker image.

Help command:

make help

Build Multi-platform peparation:

make prepare

Building multi-platform images (build & push):

make build VER=20 TAG=20

or

make build VER=20 TAG=latest

Publish docker image to docker hub:

Before publish image, first login to docker hub via cli:

docker login

Publish docker image:

make push VER=20

Or

make push VER=20 TAG=latest

Docker inspect the image:

make inspect VER=19 TAG=19

Image Environment

Environment variable	Description	Default
TIMEZONE	timezone	UTC

Docker Compose setup (running sample jar file)

Sample build jar file is here, spring-boot` download.

Build jar file command: mvn clean package, sample project spring-rest-hello-world

Connection using Traefik Proxy (ssl) Traefik SSL

# docker-compose.yml
version: "3.7"

services:
    application:
        image: docker.io/asapdotid/openjdk:19
        expose:
            - 8080
        networks:
            - proxy
        environment:
            - TIMEZONE=Asia/Jakarta
        volumes:
            - ./project/jar:/app
            - ./cron.conf:/etc/supervisor/conf.d/cron.conf:ro
            - /scripts:/scripts:ro
        command: sh -c "sh /scripts/entrypoint.sh"
        labels:
            - traefik.enable=true
            - traefil.docker.network=proxy
            - traefik.http.routers.app-stats.entrypoints=https
            - traefik.http.routers.app-stats.rule=Host(`app.jogjascript.com`)
            - traefik.http.services.app-stats.loadbalancer.server.port=8080

networks:
    proxy:
        name: proxy
        driver: bridge

Script file for running jar file:

#!/bin/sh

set -o errexit
set -o nounset
set -o pipefail

print_line() {
  echo "-----------------------------------------------------------------------------"
}

setup_applications() {
  echo "Project ready for starting, please wait a moment to build and start!"
  if [[ -f "./spring-rest-hello-world-1.0.jar" ]]; then
    pm2-runtime start java --watch "./**/*" --name "app-stats" -- -jar ./spring-rest-hello-world-1.0.jar
  else
    echo "Project cannot be starting, please check .jar file!"
  fi
}

main() {
  print_line
  setup_applications
}

main $@

Supervisor Config

Place config to /etc/supervisor/conf.d/

License

MIT / BSD

Author Information

This Code was created in 2023 by Asapdotid.