How to create containerized Spring Boot App on Raspberry Pi 4? - spring-boot

Question

What am I wanting to do?
I want to convert to run my containerized of Spring-Boot's app which is can run on amd64 systems, on Raspberry Pi 4's Docker. How can I fix the my problem?
What's the running OS on Raspberry Pi?
I've installed Ubuntu Server 20.04.2 LTS for arm64 architectures using via Raspberry Pi Imager v1.6.1 on Raspberry Pi 4.
What are the steps I have done to fix the problem?(problem is still continue)
In default version does not work on my Raspberry Pi. Thus, I've tried some couple of things at below.
I changed row of "FROM" from openjdk:15-jdk-slim to arm64v8/openjdk:17 at my dockerfile as you can see:
FROM arm64v8/openjdk:17
COPY . /projects/red-dir
WORKDIR /projects/red-dir
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} /projects/red-dir/my_red_app.jar
ENTRYPOINT ["java","-jar","/projects/red-dir/my_red_app.jar"]
Afterwards, I've built and pushed my app using with Maven and Docker:
$ ./mvnw clean package -Dmaven.test.skip=true && java -jar target/my_red_app.jar
$ docker build -t user/my_red_app:v1.0.0 .
Then, My app's depend on a MongoDB, so I changed this image from mongo to arm64v8/mongo on docker-compose.yml as you can see at below:
version: "3"
services:
mongodb:
container_name: mongodb
image: arm64v8/mongo
restart: always
ports:
- 27017:27017
environment:
MONGO_INITDB_ROOT_USERNAME: admin
MONGO_INITDB_ROOT_PASSWORD: 12345
networks:
- shared-net
colour_app:
container_name: my_red_app
image: user/my_red_app
restart: always
ports:
- 7070:7070
depends_on:
- mongodb
networks:
- shared-net
networks:
shared-net:
driver: bridge
Things that work and things that don't work
MongoDB is running. I can reach using via MongoDBCompass, but my Spring-Boot app doesn't work. In docker-compose up command, I've encountered an output like this:
...
...
colour_app | standard_init_linux.go:219: exec user process caused: exec format error
colour_app | standard_init_linux.go:219: exec user process caused: exec format error
colour_app | standard_init_linux.go:219: exec user process caused: exec format error
colour_app | standard_init_linux.go:219: exec user process caused: exec format error
Let me know what things I didn't catch. Thank you for reading.

Answer 1

I've solved my problem and tried to create simple guide for ones who are encountered this problem.
BUILD FOR OTHER OS (multi-architecture / buildx command)
Turn On "experimental" feature's on Docker Settings.
For Linux OS:
sudo nano /etc/docker/daemon.json
Add below content to it:
{
"experimental": true
}
For Win10 OS / MAC OS:
Open Docker Desktop application.
Go to Settings.
Select Docker Engine Tab on the left-side.
Find "experimental": false.
Change it to "experimental": true.
Restart Docker.
Create multi-architecture os. (Important: The image you are using should contain the OS you want to create it)
Creating a just SINGLE OS :
You can use load or push commands.
--load means that docker saves it to local disk:
docker buildx build --load --platform linux/arm64 -t <dockerhub_username>/<repository_name>:<tag_name> .
--push means that docker doesn't save it to local disk but save it to cloud (docker hub):
docker buildx build --push --platform linux/arm64 -t <dockerhub_username>/<repository_name>:<tag_name> .
--load and --push can not be set together.
Creating a MANY OS :
You can just use push command with many OS.
--push means that docker doesn't save it to local disk but save it to cloud (docker hub):
docker buildx build --push --platform linux/amd64,linux/arm64,linux/ppc64le -t <dockerhub_username>/<repository_name>:<tag_name> .